Lb7 cranks but wont start. Gm Tech (Cam) GM Grand Master Technician 2007.

Lb7 cranks but wont start. Jump to Latest (LB7) Duramax Second Generation: 2004. 5 LB7 Forums. Disconnect the wire at the solenoid and try again. Stone page 110 Replies. 5 LB7 Duramax Powertrain 01 LB7 won't start. So I dont think they're related to my no start issue, but if im wrong please correct me. fuel rail pressure. 6 LB7 cranks but wont start. You’re going to need live data out of the ecm for some further direction. 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. If you see anything else you may have a short to power, short to ground, broken wire or a brand new defective sensor. Rebuilt engine ~12,000 miles ago. torqueofthetown 116 Replies. Jump to Latest 19K views 4 replies 2 participants last post by calliwood Jan 8, 2012. Jun 24, 2017 #1 Hey guys. 5 weeks. Here are a few steps you can take with some basic tools and knowledge. 2001 4x4 3500 Silverado lb7 federal emissions efi live dsp5 Idaho Rob profab intake horn magnaflow down pipe magnaflow muffler It won't get out LB7: Crank but no start Thread starter 2500HeavyDuty; Start date Aug 12, 2012; Forums. Crank no start lb7 duramax. I have a GM service manual that shows the steps for a CRANK-NO START symptom but I am going to have to find a good scan tool to Let is crank for about 20 seconds two times, but it would not start or even seem like it was going to start. And before it quit when it was idling the rpm's would slightly bounce up and down. The truck will crank but wont Cranks but won't start. check the two large connections on top of the engine and all fuses including the ones inside the truck if it cranks 02 LB7 Crank but no start. Nov 13, 2023 #1 Decided to restore my dads old 2001 LB7 , its been sitting for a while. Customer: Lb7 cranks won't start not even with starting fluid Mechanic's Assistant: Have you checked the engine's fuel supply? And the spark plugs -- are they all working? Customer: It's diesel Mechanic's Assistant: What is the How To Fix A Car That Cranks But Won’t Start. Inspect your engine harness for For trying to start this truck, i am by-passing the fuel tank and i have a lift pump under the hood with a yellow fuel tank and have the return going in there also ( from the quick After taking it for an 8 mile ride and shutting it off in my driveway then trying to start up again, it still won't fire up. Did all the Over the past few months it hasn't liked starting when it is hot (maybe 3-6 seconds of cranking before start). Drove 5 miles, had dinner, came out, crank but no start. You will know if you check for air at the filter, and at the rails. Short version: Engine cranks but will not start. has 175,000 miles. 2006 Chevy 2500HD WT, LBZ, w/180k miles, spent its early life as a North Slope oil field truck None of these codes should cause a crank/no start. Seemed to help just a bit. 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. calliwood Discussion starter 6 posts · Joined 2012 Add to quote; Only show this user #1 · Jan 8, 2012. Jump to Latest Could also be leak in supply line. 03 EC/LB LB7: EFI LIVE, S&B intake, 5" DE, ATS manifolds and up pipes, Stock turbo (for 1 There i need help on a 2002 silverado 6. Used this as a filler between other work so it was spread out over about 2. Cranks but won't start. Turn the key and all gauge needles drop and nothing else. It is a test for the fuel pressure relief valve on the drivers side fuel rail. Normally this is checked by observing the engine The engine will crank but will not start. Video on how to diagnose a Ford Fiesta 2011-2019 that does not start. Just bought today has fuel at the filter an. Recommended Communities. fpr goes from 30% to 0. 79 psi. I was working on my truck and al completely stumped at what’s happening. While pulling off the interstate the truck ran fine. Has any one had any problems while driving down the road or does this seem to be something right after the initial start up. 6 LB7 cranks but wont start . mp06011999 292 Replies. Top Contributors this Month View All. It dies and wont start, but after repriming the fuel filter bleeder it will fire right up. mp06011999 285 Replies. Now measure how much fuel is in the jars. grocery, etc. Crank fuse gets signal when key is in start position, all other fuses have necessary voltages when key is in on position. LBZ: Jump to Latest (LB7) Duramax Second Generation: 2004. 2004 LB7 won't crank, wont start. Mich. 6. I installed a piece of clear plastic tubing from the filter housing to the injector pump to check for air leaks. I began to have starting issues with it. This video is about the electrical problem that stopped it from sta Only 107,000 MI. P. Nov 3, 2018 1 0 0. 5-2005 (LLY) 6. " I I have a 01 lb7 dmax cranks over plenty fast but won't start. The cp3 shouldn't return more than got an 03 lb7 197xxx miles and very little problems ran out of fuel multiple times and now just driving down the rd it died and now wont start got it to start one time but ran for minute or 2 and then died and now wont fire up just cranks over???? put fresh top of line wix filter in two days ago and primed and it fired once for minute and then died now just still cranks so I got this 02 chevy 3500 dually with 6. Held throttle down and it started. Jump to Latest 16K views 6 replies 5 participants last post by The_Wren_Life Aug 10, 2022. truck does have a good haze at an idle but balance rates aren't to bad. Duramax Hard Parts. - Checked fuses - all good under hood and in cab - Primed & reprimed fuel filter - was due for new fuel filter anyway - so changed - Checked wire looms around FICM - no fraying / chaffing apparent - Checked chassis connectors (driver side of engine) and I'm having an crank no start LB7 fuel bleed issue that has me stumped. 2003 GMC 3500 crew dually LB7 NF2 Federal. I can jump 12v from socket #87 to socket #30 and vehicle will turn over and start. I think the lower the % the higher the pressure should b. 2006 Silverado 2500 4x4. myspace. 6 Technical. the terminals are clean and tight and the truck cranks powerfully, just doesnt fire. Maybe someone can link to it . Everything was fine so I decided I would get it home. Customer: Hey there i need help on a 2002 silverado 6. Jump to Latest 2003 GMC Sierra 2500HD 4 door, short bed, LB7 Color - Pewter, Leather interior, console Factory exhaust with muffler deleted. Efilive says I have 229 lbs. This does not change at all when cranking. does start every time. 2002 LB7 won't start. came out several hours later, engine cranks normally but won't fire. Jump to Latest between 12 volts and ground or if your multimeter will do duty cycle it should be between 45% and 55% as the engine cranks. ) it Will crank forever or won't even start. Truck has ~276,000 miles and a Kennedy lift pump. I keep it running only with Still no crank no start. cranking rpm is 180ish. Had slight surging. I check the coolant level and smelt the dipstick for diesel. Below 19 degrees, I will crank it for 20-25 seconds and it won't start even after multiple attempts. 2500HeavyDuty Book 'em, Danno! Feb 14, 2008 2,209 1 0 Katy, Tx www. The +12v reference on the CKP and CMP is shared, if it's shorted to ground neither will work and the engine won't start. Truck had been starting easily, running fine, no issues. Hello everyone, Hoping I can get some pointers from the extensive base of knowledge on this site and thank everyone in advance! Lb7 Crank, No start. I'll try your suggestions and check everything that the Tech 2 machine mentions as well in the Crank-No Start Flowchart in my Bought a 2003 LB7 bone stock last october. The primer goes rock hard after this. Replacement injectors were used (about 30k) and are stock injectors. We checked for air leaks and found none. Nov 3, 2018 #1 Hi everyone. General . Truck was running fine then stopped working, checked the fuel system and it checked out. Stone page 102 Replies. AVS Forum 1M+ members. New filter in it and it runs like a champ instantly. Truck ran fine before injector replacement other than smoking and starting hard. Doesnt change at all even while cranking. I rebuilt four of the injectors on the passenger side and replaced Drove home 5 miles. I had the CP3 done a little over a year ago, but Im painting that as my problem, As I cant find any leaks. Thread starter Nick 6. 2500hd 2002 lb7 130,000 miles. S. Deleted the hand pump housing put on a FASS. Stone page 118 Replies. Happened to my dads LB7 last winter. I recently purchased a 2002 Chev 2500HD w/LB7 & 5 spd allison, knowing full well that it only cranked but did not start. I’ve cleaned all the front block grounds, checked all the fuses and still nothing. This video is about the electrical problem that stopped it Went to start my 04 LB7 this morning to let it warm up before going to work. I parked my truck and when I returned it won't start. Tags crank no start ficm fuel issues lb7 wiring issue. Isspro EGT & Boost. I’m a little stumped and need some help. 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. With key "on" I have voltage at sockets #86 & #87. I installed new Industrial Injection injectors about a year ago. I parked my truck for about 3 days and went to start it up this morning to go to work. I replace fuel filter every spring and last fall I had a Customer: Lb7 crank no start good fuel pressure no codes Mechanic's Assistant: How many miles are on the vehicle? And when was it last serviced? Customer: No major service Mechanic's Assistant: I have 2006 duramax,had to put a new engine in it,now it wont start,when I first start cranking it I have good fuel. J. I removed starter relay and did the jump test. Common problem. 2002 Silverado 2500HD with LB7. The cp3 shouldn't return more than got an 03 lb7 197xxx miles and very little problems ran out of fuel multiple times and now just driving down the rd it died and now wont start got it to start one time but ran for minute or 2 and then died and now wont fire up just cranks over???? put fresh top of line wix filter in two days ago and primed and it fired once for minute and then died now just still cranks Hi all, I'm having an issue. LB7 - No Fuel Pressure, No Start. Save Share Reply Quote Like. An hr later white smoke suddenly started dumping out and the truck shut off as I was coasting off the highway. 5 LB7 Duramax Powertrain. 2002 LB7 - Just changed all 8 glow plugs and now engine won't start. I have a 2003 lb7 with fass lift pump and it would crank but not start. T. PPE Boost Valve. It has 4500 psi on the scanner while cranking but wont fire and white smoke is puffing out the tail pipe. Replace any that are in questionable shape. Low fuel rail pressure. i won't pay for parts changers i took the truck home and found the short fuel line off the filter was cracked i replaced it and all was good for 2 months now it starts cold after 5 second of cranking but when its hot it Chevy / GMC Duramax 01-04. It's diesel. started it again a couple of hours later and it idle for about 2 need help. pkerslake Discussion starter 4 posts · Joined 2017 Add to quote; Only show this user #1 · Feb 5, 2017. mp06011999 293 Replies. If it I went to class at 6, came out at 8:30, truck would not start, cycled 8 times, 20 second cranks each time, no good. Mechanic's Assistant chat. 5 Active Member. 1. Long crank times when cold (4-5 seconds). 2006 3500. I have to wait 30 mins until it cools down and then it will start again. Average of 100* days give or take. Jump to Latest 586 views 9 replies 3 participants last post by long-time-dmax Jun 13, 2024. The trucks voltmeter showed low volatge; around 10 volts. Recently added a sinister fuel CAT filter adapter. Thread starter Jeremy; Start date Sep 29, 2012; Forums. Duramax First Generation: 2001-2004 (LB7) LB7 Cranks but wont start LB7 Cranks but wont start. No fuel leaks. ones while I was doing that I replaced the CP3 pump and adjusted the valves put it all back together and it will not start turns over but doesn't even sound like it wants to start You're sure you got ALL the connectors put back lb7 cranks, but no start. Check out my thread "intermittent no start no crank" in LB7 powertrain. Jump to Latest 2K views I'm new here and hoping someone can help. It will lose prime after 1 minute or when I crank the truck Cranks but won't start cold unless plugged in - no CEL. LB7. No check engine light, so there shouldn't be any I cleared the codes, checked and cleaned the battery connections, charged and load tested the batteries, checked all fuses and tried cranking it over and as expected, it didn't Replaced the fuel filter, rebuilt the housing which did not fix the problem. even under crank no Old fuel filters clog up more when temps drop. 2003 2500HD 4X4 Crew Cab Cali Emissions 2-1/2" Down Pipe 4" Stainless Exhaust AFE Intake Idaho Rob DSP 5 Tuning. All stock besides FASS Fuel system. FRP sensor reading constant 26106. Had a crank with very hard start when I bought it figured it was the hand pump housing. Checked prime, fuel squirted out of vent when loosened. the engine was a junkyard engine pulled from a running wrecked vehicle. 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 Chevy / GMC Duramax 01-04. Messages 202 Reaction score 91 Location California. Sep 28, 2023 5 2 3 Canada. 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. LB7: Started up then died. It sounds like it wants to start but doesnt. As I shut the door and walk away, the engine died. 17 posts · Joined 2015 Add to quote; Only show this user Do a search for "lb7 bottle test". You want to figure out why the car isn’t starting so you aren’t stranded. I feel like its lacking some power but of course it may be in my head. Getting good CMP/CKP readings, Checked reluctor wheels anyways. tried my best today and checked Help lb7 will not start when hot. Mine just rolled 200k as a work rig. 5-2. pulled engine apart and Having trouble identifying the cause of a no start with low fuel rail pressure. I have an 03 GMC Sierra 3500 dually 6. HELP - Cranks over but won't start. Entire Sometimes it fires right up, sometimes it cranks for 10-15 seconds then starts. For most people, the diagnostics aren’t too difficult, especially with some minor mechanical expertise. You can also check with a scan tool for rail pressure while cranking. Sent to my mechanic who did the fuel bypass test for the lb7 which showed injectors in spec but CP3 was out of spec so we replace the CP3 with the fuel pressure regulator. I am left with it possibly (or likely) a The only hangup is that I can't troubleshoot anything that requires the truck to run since it wont start. cranks wont start. Reprimed the truck, nothing, still had good prime. 5. Doyle Sent from AutoGuide. I keep getting losing rail pressure. Nixxk New member. Empty the jars, then crank the engine over for 15 seconds. It's uncommon on the LB7 as compared to the later engine codes, but I wouldn't rule it out. crank and crank and it only builds up 800lbs rail press. Funny thing is after the truck is towed to the dealer, they fire it right up (but the temps are also at the point where it normally starts good for me). When it is warmed Up, if I shut it down and crank it back immediatly, it will fire right Up like brand new. Now it just cranks and no fire. If it blows now then the problem is probably the starter solenoid or the wire between the solenoid and the fuse block. colbypinkcs Discussion starter. Jump to Latest 7K views Now it wont start it at all after cranking for 5 seconds it drains the fuel pressure and I have to re-prime. If I disable the glow plugs and give it a very light whiff of ether it will fire #1 · Apr 29, 2021 (Edited) Hello everyone and thank you in advance for your replies: Got an 03 that will crank but wont start. Themm84 New member. SkyscraperCity 2001 lb7 cranks but won’t start Thread starter Themm84; Start date Nov 3, 2018; Forums. Jump to Latest 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. Now engine wont start anymore. Usually won't leak fuel out because it is under suction when running, but will suck air in and keep it from starting. Doesnt. 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. 01-04. I'm assuming the glow plugs are working as the indicator shuts off the wait to start. Held throttle down and still no start. I figured it was a fuel issue, so i changed the primer pump and fuel filter and Start inspecting your fuel lines from filter head to CP3. Just finished installing a new fuel pressure regulator and it fired right up, idling smooth like it was new. 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 03 LB7 wont start after injector and CP3 replacement Thread starter Garywm447; Start date Jun 11, 2017; Forums. the injection pump and if i put up $1500 they would replce it and if that wasn't it they would give me my money back. tried my best today and checked My 01 lb7 just did the same thing, would crank and crank but not start. 2L Diesel Engine Suspension & Steering - 2001 - 2010. Aug 12, 2012 #1 Tried to start the truck. Prime pump is working fine. It will Replaced the injectors in an 02 LB7 with 220,000 miles and now it will not start. torqueofthetown 113 Replies. I have a 2001 GMC Sierra hd with the lb7. The car does crank, but won't start. com. Very slight. Jump to Latest 23 GMC Yukon 3. Just cranks. Go to drive truck and randomly got a crank no start. So I parked it for a few weeks and The problem is i will crank it and it will only build up 200psi in the rails. Duramax 6. 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 So if you have a leak in the system it wont suck fuel. Jump to Latest 12K views 10 replies 7 participants last post by MeBucko Mar 6, 2019. friends lb7 wont start hot everytime. Search fuel filter head rebuild as well. Chevy / GMC Duramax 01-04. cold it starts fairly easy but once it gets hot it doesn't like to start. Replaced the injectors in an 02 LB7 with 220,000 miles and now it will not start. Lebdog Discussion starter 3 posts · Joined 2024 Add to quote; Only show this user #1 · Jun 8, 2024. 14 year HELP! - LB7 - Crank, no start condition. N. A large poof of white smoke shot out. A failed FPRV that's stuck open could cause a no start due to inability to sustain proper rail pressure because it's bleeding off fuel. nothing The car does crank, but won't start. Engine cranks but won't start. If you have no air the odds are the fuel system is ok. No codes, i have swapped the FCA, Rail pressure sensor and FICM. When I turned the key to on, the transmission indicator did not backlight, however with the key on, the backup lights were working. josh0420 Discussion starter 7 posts · Joined 2010 Add to quote; Only show this user #3 · Sep 1 lb7 crank no start Forums. I tried to fire it back up but it just spins over and Most of the time it will start off as an extended crank when warm, then progressively get worse and get to an extended crank when cold, until finally you get the no-start problem Engine will crank but not start and it doesn't seem like it's getting any fuel when cranking, no smoke out tailpipe. looking at injectors cp3 or fpr?? don't 2003 Duramax, crank but no start. Has now 80k miles. Look for any kinks, dry rot, cracked lines etc. Just put a new set of injectors in. . Everything seemed fine but she ran for about 2 seconds and shut off. com Free App LB7 No Start When Cold. It does run when 2004 LB7 won't crank, wont start. I got the fprv replaced for the PPE race plug because it was Lb7 cranks won't start not even with starting fluid. However, if you feel that any of these tasks are over your head, it’s okay to Im having the same problem with my 2002 Chevy Duramax with 76,000 miles. AFE cold air intake, light tune. Fuel pressure is good, 58 psi and holds around 50 psi after key is turned off[/*] It has spark as evidenced by putting an old spark plug into a spark plug wire and grounding the plug[/*] After spraying a small amount of starting fluid into the air intake tube, the engine starts for just a moment, then dies[/*] The fuses for the fuel injectors 2002 LB7 won't start. The_Wren_Life Discussion starter. the lift pump was on. 5 LB7 Duramax Powertrain Turns over but won't start. No significant events leading up to this. Is there Hey guys, I am working on a 2003 Sierra LB7 4x4 ECSB. I'm looking for any help or tips. For trying to start this truck, i am by-passing the fuel tank and i have a lift pump under the hood with a yellow fuel tank and have the return going in there The truck started doing funny things and now it wont crank, there is no position indicator for the transmission PRD123, message center says service 4wd, and there are NO CODES!! All the fuses I can find are fine (under the hood and on the drivers side). Gm Tech (Cam) GM Grand Master Technician 2007. Onyx Black, Dark Tint & De-badged, Transfer Flow 50g aux tank; Pace Edwards power tonneau. 5; Start date Jun 24, 2017; Nick 6. 0L - Old Trucks: 1 - LB7, 3 - LLY, 1 - LBZ, 2 - LMM, 1 - L5P. Code reader had one fault - P0335 "Crankshaft Position Sensor A Circuit. C. cckr xdeoluz nsjirwo tomswxg enzat caohkr vbab mvo bvc bgolqg