Lb7 no start. Vehicle may or may not 'fire' and quit.

If you don't find a leak the I'll put 100$ on your injectors being the culprit to bleed down. Aug 21, 2017 · That pretty much isolated the problem. Feb 23, 2016 · Not to hijack, but on a buddy's 03 he is experiencing same issue but his wont start. Try removing all aftermarket programs/chips and see if that fixes your no start. cp3 is not pumping fuel monitored via efilive. I figured it was a fuel issue, so i changed the primer pump and fuel filter and still nothing. Duramax LB7 Engine Problems. Attempt to start the vehicle. The problem is i will crank it and it will only May 19, 2009 · Ride GMC 04. 6 107k Stock build, 3" body lift. I replaced that along with the Neutral Safety Switch. seller said a head job was done but after it was put back truck does not start. Make sure your battery cable connections are clean and tight after charging. No smoke at all. No leaks at all and it starts up great. Mar 9, 2011 · Yes that could quite possibly be the problem. any help will be appreciated, I've been fighting this for months! May 5, 2019 · Now turns over fine but no start. all help is appreciated Feb 26, 2022 · I have a 2002 lb7 duramax. If it turn the key to the start position it does nothing. 416269-no-start-any-techs Aug 14, 2020 · Whether you currently own a Duramax powered Silverado or Sierra, or you have considered purchasing a used GM diesel pickup, the question will cross your mind regarding what problems you may experience with the engine. I’m at my wits end with it. Then it starts right up. I am stumped at this point and have no idea what to do, I cant afford $400 at the dealer again. #1. also I can Dec 7, 2012 · Justin 2001 LB7 Silverado 2500HD LT CCSB 4x4. "LB7 glow plugs are so completely pud its not funny. Fuel rail pressure cranking is only 500 or 600 lb at about 25,000 lb running with the new CP3 which is a bit low but not much. THIS WILL TAKE 30 MINUTES--NO LESS. Oct 13, 2014 · So I installed a new cp3 pump in my truck because i broke the high pressure fitting. Sent from my iPhone using Apr 21, 2024 · Alright I’ve got a crank no start on my 04 lb7. So I parked it. Dec 10, 2019 · 2 weeks ago the truck wouldn’t start so I hooked it up and fired it up. DO NOT TURN IT TO OFF. i went to take a drive after it sat for about 20 minutes and it started then died as i went down my drive way and would not start back. I drove it a mile up the road, and it quit again, and will not start back, even with ether. 37 DC volts at the connector. 5k on new injectors installed by dealer, fuel filter was replaced Jan 31, 2011 · my 03 lb7 wont start when it's cold out. Go to drive truck and randomly got a crank no start. I told him to change fuel filter for starters then go from there. 1 shot of starting fluid, truck starts and runs fine, no smoke on startup. 6 lb7. May 12, 2011 · The truck will only start with starting fluid, When i shut it off after its been running for a while i can start it up no problem. As far as the vacuum guage the filter head has just been rebuilt and passed bench tests, I agree with the ether statements, but it is the only option he has right now, his other 2 vehicles are down completely waiting on parts. and still truck does not start. Feb 23, 2015 · It started and ran fine. We’re going to cover each of these problems in depth and discuss overall LB7 reliability. I went out to start it and it will not start. 73 Sep 17, 2017 · 2007 LBZ won't start. So far I have changed the fuel pressure relief valve, replace all rubber lines, checked the fuel pressure regulator, new fuel filter and even changed one battery with a stripped post. it Aug 22, 2014 · 2003 lb7 125,000 miles all stock no codes. All circuits and harnesses are good. 2. Over 100 ML in 15 seconds. Onyx Black, Dark Tint & De-badged, Transfer Flow 50g aux tank; Pace Edwards power tonneau. So I hooked the computer up to it and it was throwing a code for p1631and and another one for the seatbelt. Nov 30, 2022 · I'm having an crank no start LB7 fuel bleed issue that has me stumped. Came in for hard start, poor power, stalling and needed new sender unit due to OE defect. Before this it was sitting for months. I keep getting losing rail pressure. DTC P0340 will set if there is no signal from the CMP. I’ve cleaned all the front block grounds, checked all the fuses and still nothing. No fuel leaks. Dave Dec 17, 2011 · Can someone please help, i have an 03 silverado 2500 with a duramax, it is bone stock, intermittently i will get either a crank no start, or the truck my stall out when running, and sometimes i will have a code p0370. Try to start again, then turn key back to run. ryanslb7 lb7. i am a diesel mechanic mostly heavy duty. Mar 26, 2018 · No codes, but since it's not starting, not much may be set either. Nov 27, 2018 · Lb7 crank no start Jump to Latest 2K views 8 replies 3 participants last post by Jake2 Nov 29, 2018 Oct 12, 2009 · I would think that the cp3 pump would need something helping feed it. Went to go start the truck and had a crank no start. Changed the batteries last weekend and it won’t start at all. 6 duramax. Sep 7, 2010 · Yup, that will cause the no start "Theft Deterrent Sys-Password Incorrect" You will need to do a relearn procedure to get it to fire "Efi can do it off the scan tool". I first pump all the air out from the screw on the filter housing, close that up, then I bleed the valve to the left of the alternator. just cranks, no start. What could this be please anyone? Feb 4, 2017 · - LB7 - Crank, no start condition Jump to Latest 11K views 10 replies 7 participants last post by MeBucko Mar 6, 2019 Nov 25, 2013 · LB7 Dually 3500 CCLB with Lincoln Diesel Injectors, Ready Lift leveling keys, ProFabTurbo Horn, Bilstein 5100 Front Shocks, BD Performance Manifold, Banks 4" Exhaust, Banks Big Head Waste Gate, PPE boost valve, 235/75/16 stock wheels 1. Before i realized that the filter was probably clogged, it did take a couple of extra cranks to start but the batteries must’ve been strong so i didnt notice it. sounds like a ground issue between body and engine . Runs smooth as a kitten once it started. John Deere Service Manager. I also changed that and still Jul 29, 2021 · All seemed fine for about 2 weeks (I also started adding 2-stroke oil to my fuel). Bought MA rebuild kit. On the third cycle, it will ignore the VIN differences in the various modules and will start. Sep 5, 2017 · If the injectors are returning too much fuel, the high-pressure side can not build the pressure needed to inject enough fuel into the engine to get it to run and thus causes the no-start issue. It has been getting harder and harder to start, and sometimes won't start. Observed no fuel leaks 4. Now it's cranking longer, and almost didn't start when I had my family of 5 about 45 minutes from home. I installed new Industrial Injection injectors about a year ago. any way they did head job and new fuel pump and injectors. Pump primer while cranking, no start. I can start it on ether, and once i shut it off if i go to instantly try to start it again it wont fire at all and just cranks. It started with just having to crank for 5-6 Jan 30, 2019 · The old LB7 trucks are really poorly grounded and use what many, including myself would consider to be under sized cables. Jan 7, 2012 · lb7 cranks, but no start Jump to Latest 19K views 4 replies 2 participants last post by calliwood Jan 8, 2012 Jan 27, 2011 · LB7 glow plugs are so completely pud its not funny. This is normal. the engine was a junkyard engine pulled from a running wrecked vehicle. 03 2500HD 6. Also hooked up a snap on modis and there are no stored codes. After doing this I went to start it and it wouldnt start. So I put a new fpr in it. It just cranks and cranks. We strive to keep this the #1 forum for tech and information while continuing the push for new and exciting tech on the Duramax platform. Just put a new set of injectors in. Fuel Injector Failure; Water Pump Failure Dec 17, 2012 · Also, it is dangerous to spray ether into it as i have been told and have not done this. It sounds like it wants to start but doesnt. Sep 8, 2020 · Still no issues today. Wait another 11min May 11, 2022 · Hey guys, I am working on a 2003 Sierra LB7 4x4 ECSB. He then changed FPR and still, no start. I drove it around for awhile to try and get all of the air out of the system. Its my sons truck, I drove it yesterday and it ran fine. Aug 27, 2013 · 🇨🇱 🚆2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite AirEFI'd by Rob 🇺🇲🚛 2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air Jan 17, 2024 · 2003 lb7, started this morning for work, hit the cancel cruise control button reaching for he high idle by accident. Save Share. 6 lb7! cranks no start! replaced starter, has 2 new batteries, replaced fuel filter and housing, oil changed, crank shaft sensor, key relearned, using autel scanner it shows desired / actual fuel pressure 6k psi while cranking! disconnected fuel feed to cp3 to make sure Im getting fuel to cp3 and it is! primed tons of time and no start! using the Oct 21, 2015 · start-relearn-attempts, remembering to turn the key to “OFF” (not run) between each 10 minute relearn procedure. Thought to be to week batteries. 9 cummins 6 spd sittin on 35's,airdog 150, south bend dual disc, twins-hx40 with ht3tb,big sticks,o ringd and head studs, edge drag comp, smarty and a few little things :drink Dec 17, 2021 · The bulk of most no-start conditions on an LB7 have to do with the fuel system, some with the starting system, and occasionally there will be trouble caused by other sensors like the camshaft position sensor, crankshaft position sensor, fuel injection control module, a faulty ECM, and more. I'm in the garage with the doors closed. Jan 4, 2019 · hello guys Im hoping maybe I can get some incite on my issue, the truck is a 2001 duramax was given this job initially it was a hard start then it went from a hard start to no start, so I was instructed to replace the cp4 pump and injectors so i did that now I have 304 psi on the fuel rail, I have disconnected the fuel pressure regulator and it jumps to about 390 but that is max. Sorry i did not have the opportunity to hook it up on a cold start though to monitor pressures. 6 Technical. Duramax 6. If engine fails to start stop cranking engine and leave bleed screw shut and pump up hand primer till it is hard. I self tested, checked fuel leaks, monitored PIDs. Ive had a few quarter tank start issues so I went straight to the primer bulb. Power good idle is good no smoke. Completely stock. Sep 28, 2023 5 2 3 Canada. i put six inch lift and 35in tires on it a little over a year ago. Originally threw a p1550 code. All injectors are good. 5 nitto at on 20 inch American Racing 20x10 wheels, Stage 5 Built Transmission by Mike Cole with triple disc billet low stall converter, 4 inch Injen cold air intake, Profab Intake Horn, Batmo Wheel, PPE Race Valve Apr 25, 2020 · The last Time it didn't start, I waited 3 hours and when I came back it fired right back. Lots of info with hopes it will help. Oct 8, 2022 · I know this is a problem but should still start. I removed the cab so I had everything for the harnesses unhooked. Our last ditch effort was to disable the security system. IM getting no codes. If you have too much suction, after changing the fuel filter, the restriction could also be the sock in the tank. Check to make sure your fuel filter is tight and the gaskets are not pinched. I did a voltage test with the key on, and it reads 11. Fixing LB7 Duramax Fuel Filter Housing O-Ring Leaks Aug 4, 2024 · I recently rebuilt my lb7 motor, put it in and just cranks, unplugged the fpr and I’m getting 24k fuel pressure, good compression everything is reading and only code is for intake heater. Started off being sluggish and got progressively worse until one day no start. Like. Dec 8, 2012 · I went ahead and erased the ecm with the scanner, and it started back with no REP light, and accelerator was working. ASE Certified, former GM Parts guy. Getting good CMP/CKP readings, Checked reluctor wheels anyways. desired is 50ml. and now have a no start condition. B. It shows almost no rail pressure when hot. mojito5000 New Jun 11, 2017 · About us. Sep 1, 2014 · It is normal to not get alot of fuel flow with the engine not running as it has to push through the CP3's gear driven pump. Well about two moths ago I had to Jan 8, 2022 · Replaced all the rubber lines. This is likely not a u-fixit truck. what i am looking for is some info on the high voltage coming from the fuel control module to control injectors. I have not noticed any fuel smell, but have not really checked the tailpipe either. If is sits for any length of time, no start. He got up this morning and said it sounded weird when cranking but will not start. thought maybe the starter was froze that time or something. Cleaned all the electrical connections and it strated. I also want to say my batteries are trash so i was using my die hard battery charger to start the truck with low amperage charging. I pulled connectors to the ficm. Fuel filter and batteries. Lots of times the lb7 and lly into lbz the filter heads need rebuilt or they have a Crack in the housing somewhere allowing bleed down causing a no start. When I bought the truck the kid said it needed an fpr. The security light flashes when I open the door, and I have done the reset a few times but don't really know if that's it because it quits flashing once I turn the key on and is replaced with the battery light. Went to start it last week and no go. I’ve replaced crankshaft position sensor. Theft deterrent, loss of communications, short to battery, and the list goes on. The engine won't start at all cold or warm without a tiniest spritz of starting fluid. Loping idle but no smoke. Started and ran fine. Did my best to track down ignition one single parameter. If you pressurize the fuel tank you will find a leak. No smoke at idle, has good power. I’m fairly new to the diesel/duramax world and hoping to get some tips, potential solutions, recommended parts. Duramaxdiesels. If the injectors did not open, I would expect the fuel pressure to rise higher. Aug 8, 2016 · hello everyone im new to this forum but not new to the diesel world. A leaking o-ring not only results in a fuel leak, but air can also enter the fuel system. i put the jumpers on my drivers battery and no luck. No fuel leaks. I had previously got stuck in very deep water. Nov 19, 2011 · I recently switched to EFI live, and I found out that with the Edge unhooked there is No Start! Even before EFI was flashed into my truck. I hooked my scan tool to it and it has no communication with anything. Dec 29, 2009 · NOOOOO!!!! wait! don't blow your money on that yet! i had the same b/s on my LB7 last year. Mar 11, 2020 · But, under hood filter rebuilt about 9 months ago. Theres lots of cranking power, brand new glow plugs, new fuel filter. Any help on this is appreciated Jun 23, 2015 · 2003 GMC 3500 crew dually LB7 NF2 Federal. Looking at a 2002 Chevy 2500 to potentially purchase and the listing has it as a no start problem. Truck stills cranks and no start but rail pressure is a night and day difference from the old cp3. Pumping the WIF housing pump and cranking the engine and it started right up. Background: This truck only has 100K miles. No idea where it was plugged into. Happened to my dads LB7 last winter. Apr 17, 2020 · Drivers side next to the bail connectors. butch2000 New member Oct 25, 2007 · LB7 No Start! Jump to Latest 6K views 14 replies 4 participants last post by Es_LB7 Nov 15, 2007 May 24, 2020 · Last ran 6 weeks ago no problems except had to crank longer than normal before it started. It was driving great, the customer drove home from work and would not start (it cranked great) the next morning. Pump primer till you get bubble free fuel tighten bleed screw and crank the engine. Oct 19, 2018 · 2) GM only provides a specification for return fuel when cranking for LB7 engines, however, we have done some testing on a good running LB7 and found that injector return flow at idle from one bank was 95 – 110 ml in one minute at 21,000 PSI. Sep 9, 2014 · I have a 01 lb7 dmax cranks over plenty fast but won't start. Hoping it would be easy. When i bought it truck will only start on ether and runs fine no engine codes. Sort by Oldest first 2003 2500HD 6. There is no sign of fuel leak since Fass lift pump and injection pump installed. Bought driver side fuel rail with new sensors, no change. 29,000 original miles. Aug 12, 2012 · Tried to start the truck. Still no crank no start. Lb7 crank no start good fuel pressure no codes. Leave the key in the "on" or “run” position, until the 'security' light goes out or quits alternately flashing between "Security" and "Battery". Worth checking. it ran all day then broke down again a few Feb 6, 2009 · Feb 5, 2009. Truck has ~276,000 miles and a Kennedy lift pump. Buttoned up and puttered around shop with it. No engine lights on dash. Unit was setting for apprx 1. 6 duramax (LB7) all stock (no mods) Save Share. I took it for a drive and it was stuck in limp mode. May 23, 2020 · 2001 lb7. 6L LB7, my truck starts from cold and runs great until I shut it off, it won't start up again while hot, it turns over but won't fire up, priming doesn' t help it to start. Truck had been starting easily, running fine, no issues. Truck runs strong when it runs no injector issues. Too little vacuum (less than 2 inches Hg) means that it could be sucking air. Ever since this past summer it has been progressively harder to start after I drive the truck, then cut it off, and try to start it back up between 10min to 3 hours later. The security light flashes for 10 min and goes off and my truck starts. Scanner shows no codes. Coding P0090 and P0193. Seems to turn over harder than I imagine It should and does not maintain over 200rpm unless both batteries are hooked to a cummins. Jump to Latest 2003 LB7 2500HD 6 speed manual -Sold- 2010 Camaro SS EFI live, Magnaflow exhaust -sold-2005 Kawasaki Brute Force Nov 16, 2012 · 2500 hd 01 lb7 175,000 miles all stock except 6in lift (no programmer anymore) ok so truck was running good except i had tested the pump about a month ago an pump only put out 17,000 psi and would go into limp mode at like 65-70 mph i kept my scanner in my truck and have just been clearing codes when i drive. I checked DTC's, and found a P0335 code. If the 4th start attempt fails to start the vehicle you did one relearn step (or all of them Nov 13, 2015 · lb7 no start after injector replacement Jump to Latest Follow 6K views 2 replies 2 participants last post by adams. . Oct 13, 2014 · Just rebuilt the fuel filter housing, Replaced the hoses with clear hoses and bled the shit out of it and now my actual fuel rail pressure is 50 mpa and desired is 47 mpa but still no start. Release to “run” position. We have limited diagnostic tools, volt meter and an OBDii. Repeat this cycle until engine starts. after buying a new glow plug control unit it would not start still but the help of some starting fluid did the trick. Dec 13, 2018 · No Start or Hard Start Use vacuum gauge, check the suction, you should have no more than 5 inches Hg at WOT (wide open throttle) or 7-8 inches Hg under load. No fuel in oil no smoke out of exhaust. Play Truck - 2002 LB7 2500HD Crew Cab Short Bed. Only symptom is, crank but no start after short trip, when engine is not completely hot. Funny thing is, when try it acts like it wants to fire then shuts immediately off. When I was all done I went to start it. 5's with Hercs, Fox and icon Shocks, DMAX ecm, built tranny by Mike at Inglewood, AD165, 4" MBRP turbo downpipe 2 a 5" straight pipe , RAM AIR 2 a AFE stage 2 intake, AFE intercooler pipe, FS 2000 trany and engine filters, Mag-hytec tranny and diff, front and rear bumpers w/spray on liner, Recon cab lights, recon marker lights, HID's hi and low,4 kids, 3 Aug 7, 2020 · So last week my truck let me stranded, no start, no codes I only had my torque app available, so I couldn't do much troubleshooting. Apr 19, 2023 · Howdy. I've replaced FPRV and fuel filter. Cranked over slow, found dead battery on passenger side and also primer would not pump fuel, rebuilt fuel filter head, new battery. When I turned the key to on, the transmission indicator did not backlight, however with the key on, the backup lights Oct 1, 2018 · Old fuel filters clog up more when temps drop. Likely if there is an issue with any of those systems Dec 11, 2011 · After I did my LB7 injectors, I bent a few of the pins in one of the large bale wiring connectors, causing a no-start condition. They seem ok. Does anybody know what could be going on. I can take the plastic cover off the starter relay and manually activate the relay and it will start right up. i have this truck that came from another shop, i do not know what the whole story is , but it came to them as a no start partly disassembled by the owner. So I replaced the ficm after reading Thats a common problem, my truck started for about 10 seconds and quickly died to not be started again. Oct 14, 2012 · lb7 has fuel wont start. Aug 4, 2011 · (charger has been on the truck the entire time) Efi live did not show any rpms while cranking so pulled the connector on the CKP. The security light also comes on when im driving around, it stores a code in the bcm something like "wrong code but ok to start". Fuel rail pressure was within specification 159-203psi 5. come back a day or two later and fires right up and works fine for couple days/weeks. 85-11. 03 on the hot side. It wouldn't start. Nixxk New member. 0L - Old Trucks: 1 - LB7, 3 - LLY, 1 - LBZ, 2 - LMM, 1 - L5P Dec 29, 2012 · hi i am new to this site and i was hoping i can get some help on a truck i just bought. DO NOT TURN OFF KEY YET !! 3. Brought it back in and changed the starter because it was bad anyways. Jan 23, 2018 · 2001 2500hd 4wd extended cab ls, s&b cai, 4" stainless steel exhaust, efi live from atp trucks, edge cts, ppe boost valve, banks intercooler pipe, air dog ii 165, rebuilt tranny with suncoast kit, transgo shiftkit and billit torque converter, new upgraded tailshaft, pump rub fix on transfer with new aluminum tail shaft, new tow mirrors, new gage heavy duty front and rear bumpers, beans sump good evening . 2018 Solitude 310GK fifth wheel with a 12' Haulmark tag trailer to haul toys in. Bulb is hard and no air in the fuel at the bleeder screw, but there is little to no pressure at the check valve unless the fass is on. First of all the glow plugs are just a heating element and have very low resistance, somewhere around 12-14 ohms if I remember right. N. Check your rail pressure when it won't start and see what it is building to. I would have expected to see alot more fuel in your bottle for 10 seconds of cranking though if it was a high return rate problem. removed pressure line from cp3 and turned truck over and nothing comes out just the Apr 4, 2013 · 02 lb7 ,battery's are good full charged and my starter just clicks. no visible fuel leaks cranks normal, with no codes. Engine RPMs were good on starting and cranky. 2004 gmc 2500hd crew cab short bed 4x4 at lb7 6" fabtech lift s&b intake straight pipe 35" tires with mt wheels Feb 4, 2008 · LB7 no start Jump to Latest 2K views 23 replies 9 participants last post by b_buechter Mar 5, 2008 Nov 13, 2023 · Start date Nov 13, 2023; Tags lb7 crank no start Forums. Started fine at that point. Still no start. same thing now where it sat Apr 3, 2018 · Help! 03 LB7 Will not start. I modified the wire harness and i did accidentally cut one wire but i fixed that. they Oct 29, 2012 · Hey guys, need some help with my my 03 lb7. Changed my oil Friday and found the leak, it was about five quarts over full with fuel and coming out the blow by tube. I did all the work myself, and it took about 25 hours total I would say. It only does this when it is below 19 degrees outside. EFI Live by Idaho Rob, 660K+ and rolling, Undercover Bed Cover, Vortex spray in bed liner, Odyssey Extreme Batteries, Westin steps, Bilstein Shocks, Road Master Active Suspension, M/A Pump Rub Kit, PPE Trans Cooler, PPE 3" downpipe, MBRP 5" Exhaust, Edge Insight CTS, K&N drop in filter, AirDog II 100 w/ CAT 751, LLY FF Housing, Running on LMM Dec 12, 2012 · Clifford is a 2005 GMC Loaded SLT 2wd with; true cold air intake mods, ported LBZ turbo inlet mouthpiece, AFE Inter cooler pipe, Diamond Eye down pipe, BD drivers side manifold, V2 radiator, thermostst controlled oil cooler, Edge CTS2, 19. Then crank engine again. I looked at some forums and some said it could be the fuel pressure regulator. i have 05 duramax 2500hd LLY, the drivetrain is completely stock, no programmer, no cold air intake and no exhaust. switched to my passanger side battery and the truck fired up. I have an 03 2500 hd with the 6. (the days i forget to plug it in) last year even at -30 celcius, it would fire up perfectly fine, but this year when its below -15 it will not start. 5" aluminum wheels with factory lug covers, Goodyear G647RSS 225/70/19. Wait 11 minutes (time it). Generally speaking this is how you check any glow plug on any engine with glow plugs. Took a jumper wire and tapped the "reference" pin and efi live recorded rpm's. Pretty sure observe battery voltage there. Here are the balance rates: Jun 19, 2010 · 2007 Chevy CC/SB LBZ Classic LTZ 409CI, Mahle cut and coated Pistons, Carrillo Rods, ARP Main and Head Studs, Keyed Cam and Crank, SoCal Stage 2 heads, PPE Dual Fuelers, PPE Lift Pump, Bullseye S472, PPE Manifolds and up pipes, 5" MBRP Exhaust, S&B Intake, EFI tuned by Mark@Danville:thumb, Exergy 60's Oct 17, 2011 · I had some problems with my 03 LB7 about 3 months ago. Mar 18, 2017 · You need to start over by opening the bleed screw on filter. All told, there are six different iterations of the Duramax: LB7, LLY, LBZ, LMM, LML, and L5P spanning from 2001 to the present day. Feb 27, 2019 · DTC P0335 sets if there is no signal from the CKP sensor. Apr 11, 2015 · Hello everyone, I'm new here and hoping someone can help. 5 years prior to be pushed in shop. Oct 12, 2017 · LB7: No start issue lb7 Thread starter ryanslb7; Start date Oct 11, 2017; Forums. Dec 26, 2014 · Need help I just bought a 2002 duramax it is not running. by a long shot, we replaced something, i believe its called a Ignition Recognition Sensor in my steering column. Jan 16, 2022 · 2002 LB7 with 270k miles. The truck has 144k, has about 3. emmissions completly stock 75000 miles about 5 months ago i had a check engine light code said glow plug Jan 18, 2016 · I just bought a 2001 gmc sierra with the 6. PLEASE HELP!!!! _____ Feb 13, 2009 · Truck has been towed to the dealer for a no start and they can't figure out what is going on. reflash new tune- cant communicate with ecm pulled ecm cleaned/inspected all ecm pins- nothing some Aug 5, 2020 · With that being said, the LB7 is known to suffer from fuel injector failure, bad water pumps, fuel filter housing leaks, blown head gaskets, and engine overheating. 5 turbo, Edge CTS insight monitor Feb 28, 2021 · The problem is no power to injectors (LB7 need 96DC volts). Nov 28, 2016 · We are continuing to have a no start !!! 2002 GMC Sierra 2500 HD, LB7 Duramax, Stock 296,000 miles New injectors at 208,000 New CP3 at 240,000 Good backyard mechanics (We did the injectors and CP3). Air dog 150, drilled out fuel rails. Seems to make absolutely no difference to spray a little wd40 to it. All sensors test good, replaced ECM, no fuel leaks, have desired bar pressure, injection pump is primed and stays primed. Getting plenty of fuel to the Schrader valve with no air visually. Apr 30, 2016 · installed new lbz cp3 on my lb7. Feb 16, 2012 · 2001 chevrolet lb7 ARP head studs and main studs, BD drivers side exaust manifold, Afe intake and 4" straight pipe with Ported intake, EFI live 5 position. Dec 18, 2016 · Damn. If the CMP Sensor signal is not present at start-up, the engine will not start. but it was doing the same thing it would crank and everything seemed fine but it wouldnt start. I rebuilt the filter head about 4 years ago when I was seeing the same issue and replaced both short fuel lines. Thought I had a fuel leak because of fuel on the ground but couldn't find it. Used this as a filler between other work so it was spread out over about 2. Name: Matt. “Low Voltage to Fuel Injection Control Module” it will not clear. Everything was put back together after headgasket replacement. New filter in it and it runs like a champ instantly. 5 LLY 3500SRW Loaded Allison 4dr LB EXTRAS Mac cold air intake, pcv reroute, Diamond eye DP, AutoMeter PhantomII Tripple pillar, EGR Blocker, Leveling kit, 305/60/18MT BFG KM2 on Ultra 5 star wheels, Bilstein shocks,Spray in liner, Billet Grill, Chrome tube steps, LED tail and brake lights,all HID 6k up front Sep 3, 2016 · The glow plugs help a diesel to start in cold weather-- not so much if above freezing. i than disconnected the fpr connector which should give max pressure correct? i verified i have fuel on the supply side running my airdog also noted the return on the cp3 is flowing a lot of fuel. The primer on the filter head is not "hard" after I drive the truck and turn it off, but it no longer has no resistance like it used to. causing body module to not report properly . 2004 duramax 6. Always starts right about 1400PSI if it can hit it. Found a crushed o-ring in the brand new filter head. Jan 25, 2017 · Ran crank no start tests on 6-2792 of the factory service manual. Only 2 things a diesel needs to start: Fuel and compression - maybe glow plugs if it's really cold. my batteries were almost cooked (load tested individually, one had 320 cca and the other had about 400, (they were supposed to have 675) so i replaced both of them with 2 800 cca brand new batteries. checked the return line for any fuel, no pressure. Put a new sensor in this morning tried cranking but still no start. i think that was luck or something. So I suppose if they are bad it could cause a no-start. Aug 15, 2009 · today after doing some stuff around town, i went to lunch and truck wouldnt start. they explained to me that it would start up fine, run for a little while, then when the sensor overheated, it would shut off because it didn't recognize the key. Sure sounds like an air leak to me. not sure where to look into first. truck died now is crank no start, primed filter multiple times it will start and die after 10-30 second of running even tried idling up still died please help Jan 15, 2011 · 2023 GMC Denali 3500 DRW, Pearl White, Banks I dash and Deringer, 255/80R17 Toyo R/T Trail on spare set of aluminum wheels for winter. The truck will not start with the key. 5-2010) but the pcm will change fuel pressure reg command and compensate for it, the command on fuel pressure regulator in the 35-50% range during crank if memory serves me right on LB7's. Sep 12, 2012 · Been struggling to get my truck to start after rebuild. May 20, 2013 · 2006 GMC Sierra 2500 CCSB 4x4 LBZ 4" MBRP downpipe to 4" duals, pcv reroute, egr blocked, Danville Stage 1. 2002 Silverado 2500HD ECSB 8. When I came back out it had shut off. Nov 13, 2023 Feb 22, 2023 · Current: 2003 Chevy Silverado 2500HD CCLB (600ish horse) LDS 45% SAC, Thourghbred diesel CP3, DSP5 from moonshine, Full 5in, ATS Stage 3 Allison with CoPilot, Longhorn Trac Bars, Kryptonite TRs, DHD Centrelink brace, Idler and Pitman braces, Reverse Leveled with 2in drop shackles and rear block delete, 22x12 Fuel Forged on 305/40 Streets Sep 13, 2022 · My opinion is not the opinion of Duramax Forum, Vertical Scope, or other Duramax Forum staff members! Non Vendor contact information, URLs and/or links are NOT allowed in signatures OR on forum! 23 GMC Yukon 3. He did the Nicktane adapter and cat filter and still no start. You definitely have electrical problems. Cranks but no start. pulled glow plugs and cranked checking for fuel, none. Apr 11, 2013 · Have LB7 with approx 220,000 miles that we did head gasket job on. This all started mid Dec 2019. Jul 30, 2014 · LB7: 03 no start Thread starter butch2000; Start date Jul 30, 2014; Forums. Sep 29, 2012 · Went to start my 04 LB7 this morning to let it warm up before going to work. i had this the other day when i let my truck sit for 4 or 5 days without starting it. I have an 03 GMC Sierra 3500 dually 6. DTC P0336 sets if the CKP sensor signal is out of range. I drove it into my garage to replace the steering pump and gear box. The important grounds that come to mind for what your issues are would be the stud on the fire wall to the engine, the engine to frame ground, the battery to frame grounds and the ground under the A pillar on the driver side. com was founded in 2006 and created a site which houses some of the best known Duramax tech you can find. I do not mean to sound like a know it all because i dont and have had this truck for 11 months without any problems and have owned no other diesels. add a couple a new ones if nessessary . i find this vert prevelant lately in cars and trucks sit oer night or start run fine but initally it is weak and not letting electronics work properly Feb 26, 2021 · I bought a brand new filter head/filter, still no change. Primer gets hard about 5-8 pumps, still no start. After picking up the motor he got about 5 miles away and the truck died at a stop lite and hasnt started since i checked all grounds batt terminals changed the fuel filter the air dog lift pump Feb 7, 2010 · dont care what they did ck all ir grounds all of em . Gives me a P0370 code. Replaced all seals, still no change. 01 chevy 3500 with stock engine. Also if there is no lift pump how come there is aftermarket lift pump options for the duramax. Some vehicles will not engage the starter. The primer goes rock hard after this. Jul 21, 2015 · i have seen some start and run at 3k psi but in those cases the fuel pressure releaf valve(04. Oct 20, 2010 · A friend of mine used my truck to go get a motor for me for a different project,he filled up my truck (04 lb7 ats trans, copilot,ppe boost valve,4 inch magnaflow,afe intake and efi live) and headed off. It’s a project truck and I have been replacing things as I have time. Truck ran fine before injector replacement other than smoking and starting hard. No air leaks. Jun 14, 2016 · Problem: 2002 Chevrolet Silverado 2500HD with Duramax LB7; no start after installation of injectors rebuild, water pump, FPR, and other components. Here is the steps Try to start it, then turn the key back to run. I left the truck to warm up. it cranks over but wont fire. Replacement injectors were used (about 30k) and are stock injectors. Apr 1, 2021 · I have a 2003 lb7 with fass lift pump and it would crank but not start. i Sep 29, 2018 · Drove the truck yesterday and went to start today, started fine but only ran for about 10 seconds and died. Dec 20, 2014 · U1000 and no start. No major service. Still no CEL. something like that. I live in the south and never worry about glow plugs. I have to pop the hood, pump the pressure and quickly start it up. Apr 13, 2024 · 2002 lb7 duramax no crank no start Jump to Latest 995 views 23 replies 5 participants last post by long-time-dmax Apr 19, 2024 Mar 8, 2015 · That's the whole problem, it WILL not start, no way no no how, does not even try. 2002 Silverado 2500HD with LB7. Mar 4, 2011 · 3-4-11 i have a 2003 gmc 2500 hd lb7 w/cal. Also check the fuel lines going from the filter housing to the CP3. Not a single fuse is blown and I am getting diesel to the injectors. sometimes it will immediately restart, other times it will sit for several hours then restart. 2002 GMC Sierra 2500HD (Green Goblin) CC/SB 4x4, Leveled, LB7/Ally, G80, 3. No smoke, runs like New. Further investigation revealed the 40 amp fuse blown. Duramax Hard Parts. precision converter, billet input, built transmission, Feb 25, 2022 · just bought a 2002 2500HD duramax lb7. Took it out for a test drive and it died about . If batteries are weak, that can reduce the start voltage and affect computers. Took it to a diesel shop and they couldn't figure it out either. I replaced the sensor, and checked the wires near the sensor. Jun 15, 2009 · Sorry in advance for long post. This causes various performance issues, hard starts, and even engine codes. May 22, 2013 · So I have a question about my truck not starting with the key. 5" spacers all around, Ghost Fuel pressure gauge 0-60psi, EGT, Boost, DSP5 Key Switch, Moonshine EFI tunes, High Idle MoD, Nictane Adapter with 1r0750 filter Oct 18, 2010 · 02hd chevy ccsb d-max 01 dodge 2500 5. May 24, 2023 · so I got this 02 chevy 3500 dually with 6. As I shut the door and walk away, the engine died. He said its been starting rough for the last few weeks but clears up and runs fine. All stock besides FASS Fuel system. 5, BF Xenon 6000k Headlights Low & Hi, Air lift Remote control 5000# air bag system 2002 LB7 Duramax crank no start diagnostic help? 2002 Silverado 2500HD LB7/Allison CCLBBought as basically nonrunning/a builder because it was loping and knocking hard at idle, sounded like a stuck injector on the left bank. Nov 5, 2020 · If you’re going to own an LB7 Duramax over an extended period of time, the odds are you will experience this problem. I have changed the key tumbler and housing, that did nothing. Oct 20, 2017 · Meter the flow rate when you turn it over to make sure the ecm is firing the injectors 2004 Silverado Cali lb7, Airdog ll 165, fresh sticks at 325k, Rick Fletes Dsp 5 on v2, 33x12. replaced the fuel filter housing assembly due to fuel leaks, pumped and primed the system, monitored FRP PID while cranking, 0. the lift pump was on. If the CMP Sensor signal is lost while the engine is running, the engine will operate normally. 6. Apr 7, 2011 · Replaced the injectors in an 02 LB7 with 220,000 miles and now it will not start. 13 Dec 18, 2015 Jan 7, 2024 · Start by fully charging both batteries overnight, at least overnight. May 1, 2013 · 2004 LLY Duramax Chevy Silverado 2500HD 4x4 CCSB Sinister EGR Delete w/ Finger Stick, 4" Straight Pipe, LBZ turbo mouth piece, PCV Re-route, AFE Stage 2 Cold Air Intake, Dual Red-Top Optima Batteries, Superchips Tuner, EDGE Jw/A CS, Iron Cross Push-Bar Front Bumper, 17" Eagle Alloy rims with Toyo Open Country Highway Terrains, 2 Post Extending Tow Mirrors, Escalade Colour Matched Door Handles Nov 18, 2023 · LB7 No Start Jump to Latest 1K views 19 replies 5 participants last post by long-time-dmax Feb 13, 2024 Aug 3, 2014 · LB7 - No Fuel Pressure, No Start Jump to Latest 7K views 5 replies 3 participants last post by budtoh3zo Aug 4, 2014 Mar 5, 2023 · Between the fuel tank and the cp3. The ECM is commanding the FICM to supply the power to the injectors. Vehicle may or may not 'fire' and quit. Feb 23, 2009 · get into my truck and try to start it. 6. Cranking speed is registering at something reasonable, around 170 rpm. LB7 . disconnected the return and watched as I cranked and it is pumping out a lot of fuel. If i have mistated information i apologize i have only done what i know how to do. it ran fine for the first few hours i had it. Got between 10. Turn key and everything seems to work but will not turn over. I have a lift pump so the fuel rails were primed instantly. I tried to fire it back up but it just spins over and doesnt start. Jul 4, 2022 · Having trouble identifying the cause of a no start with low fuel rail pressure. Primer is hard and when you crack the bleeder, it pisses fuel nicely. There are no engine codes either. i tried everything i could think of and everything mike could think of. Saw no codes 3. No significant events leading up to this. If the temp is above 19 degrees, the truck fires up in 3-5 seconds and runs great with no idle issue or problems on the road (it has been the perfect truck). Rebuilt engine ~12,000 miles ago. Feb 9, 2020 · An 02 lb7 with new injectors, (one slightly out of range) new lines, new fpr, prime head, glowplugs. pulled engine apart and injectors and cp3 looked to be new. Feb 10, 2017 Jul 20, 2022 · 02 LB7, will turn over but not start even using starting fluid 😬. I have a 03 LB7, 128,000 mi, and put into service 10/02, so it is currently still under the injector warranty. Not sure where to go from here but was hoping maybe this plug will be my cure all if I can figure where it plugs into. Is there one in the tank. 2003 256,000 miles and counting Crew Cab Dually. The only way it will start is with the puff of Mar 23, 2018 · LB7 No Crank No Start Jump to Latest 20K views 12 replies 4 participants last post by mizterwizard Mar 28, 2018 Jul 24, 2023 · hey guys I have a 2004 ccsb lb7 that i did just did arp head studs on. Last ran 6 weeks ago no problems except had to crank longer than normal before it started. I have told him to buy and install a lift pump on it. 5 weeks. some scope captures of… Oct 23, 2009 · no start p0374 code truck is a 03 silverado lb7 . Using the GM manual for troubleshooting, I don't have any visible signs of diesel leak anywhere. They do use lots of AMPs on start, -- that is one of the reasons for two batteries. problem is it cranks but does not start. 5 mile down the road. 1L 4x4 Jan 17, 2014 · The truck came in not running, customer has been messing with it for about 6 months. Feb 18, 2021 · batteries charged and same the other guy can jump the starter solenoid, truck will turn on , still need to find the communication issue but on the start relay I was curious pin 71and 9 from the ecm both go to the start relay pin 71 has 12v and pin 9 has 9v in the key on position, so I'm loosing 3v through the ecm, which won't let it start Mar 4, 2013 · deeahgee 06 crew cab dually Budnik 19. I got it back together and now it will crank but not start. Need your help to fix that Beauty ! May 7, 2012 · 2. Looks like from 5 minutes to 2 hours of sitting is the critical "no start" Time. When it sits for about 1hr then i have to use starting fluid again. ysiidfrs klj hpak pxrqo ncpkjj txwbdbu wetr bpsncrg udkl jeom