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Prev Professional Automotive Repair Technical Discussions for May 9, 2008
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Open Help Requests for GM
Help Request Answers
1987 Buick Electra Limited 3.8L Extended crank time VIN: 1G4CX5130H
This vehicle has an extended crank time when cold, or after its been setting for a couple of hours. It has spark and fuel pressure when the problem occurs. Other wise it runs great. It also seems to have a longer than I think it should crank time even after se...
2002 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54KX2
Hey Guys I have good one. this Lesabre miss's and sounds to be popping back threw the intake, only when hot and under heavy load. When it is missing the 18X signal looked funny and replced the CKP sensor, no change. The o2's go dead lean. ( fuel pump wave look... Trouble codes: P0300
1990 Cadillac DeVille 4.5L Cuts out, BACKFIRE VIN: 1G6CD533XL
hi guys, really stumped on this one. this car backfires through intake and exhaust at idle mostly when cold. we put a spark tester on cap and we are seeing erratic spark on all cylinders. cap and rotor were old so we replaced them. looking at inside dist saw ...
1998 Cadillac Eldorado ESC 4.6L Stabilitrak VIN: 1G6EL12Y5W
This vehicle exhibits unwarranted Stabilitrak engagment while driving. This mostly occurs while turning left about 25 MPH, however it will also occur while driving straight under light acceleration. Sometimes the "STABILITY ENGAGED" message appears on the HUD,...
1999 Cadillac DeVille 4.6L Misfire VIN: 1G6KD54Y9X
Group, A misfire on 1 entire bank on a new engine... Installed new factory longblock for headgasket issues and smoke. Installation went smooth dropping cradle. New Delco secondary plugs and wires, routed and sheilded. Have a misfire only at idle and smooth w... Trouble codes: 300B (random misfire on rear bank 1-3-5-7 only), 1376 (ignition module grounding issue)
1987 Chevrolet Corvette 5.7L engine cradle VIN: 1G1YY2182H
Have already referenced All-data and Mitchell for information pertaining to the removal and replacement of the engine cradle on this vehicle. Neither source provided any. If anyone can help me with a removal procedure for this cradle and/or some idea of the ti...
1998 Chevrolet Tracker 1.6L MIL Lamp on VIN: 2CNBJ1364W
This tracker came in on friday for a po400 code egr flow excessive tested the valve with a vacuum pump , engine stalled at 4"hg. pressure transduce had a leak in it, replaced it also the egr solenoid valve was bad also replaced it, tested the egr diagnostic va... Trouble codes: P0400
1998 Chevrolet K1500 Cheyenne 5.0L brake pedal VIN: 1GCEK19M2W
this is a friends truck. pedal heidth has beeen an issue since day one. replaced pads and machinedrotors thistime.pedal is spongy, and not very effective. light pedal pressure will holdtruck at stop and in gear. but application of petal at speed results in too...
1998 Chevrolet K3500 Cheyenne 7.4L fuel gauge erratic VIN: 1GBJK34J0W
the problem is that the balance module does not always pump from the rear tank, and that the fuel guage is erratic. i can see how the balance module effects the gauge, when i vary the voltage at the purple wire going to the vcm, the guage moves up and down. ha... Trouble codes: P0462 (fuel level sensor)
1999 Chevrolet Express 3500 5.7L reverse VIN: 1GCHG39R4X
Vehicle is part of a fleet that we service. Van has 150000+ miles but has been serviced regularly including transmission flush with BG flush and syn. fluid every 30,000 miles. Transmission is a 4L80e with no codes and ever gear works perfect with perfect shift...
2001 Chevrolet Malibu 3.1L Starting VIN: 1G1ND52JX1
Hello, We are looking for info on disarming the security system. Dealer says it can not be disarmed. It has been problematic. When customer tries to start vehicle sometimes theft light will be flashing and will not start. Let sit for ten minutes till light goe...
2001 Chevrolet Suburban 2500 6.0L engine VIN: 1GTGK13U91
hi everyone,i'm working on trying to remove this engine & i'm left with the very top centre bell housing bolt i can't get at.does anybody have any tricks to getting at this one besides dropping the rear of the trans down.any help would be greatly appreciated.t...
2004 Chevrolet Trailblazer LS 4.2L parking lights VIN: 1GN5TE764G
hi every one i have a 2004 trailblazer and the parking lights stay on all the time i pulled 4 fuses and the park lamp relay and they stayed on then all of a sudden 3 went off and only the left rear was on i was going to pull the lens and when i opened the lift...
2003 GMC Yukon XL K1500 6.0L ride control VIN: 1GK7K66U73
Hello and thank you in advance. I have a customer with a service ride control message on. I scan the vehicle and find I have no communication with the ESC module in the rear of the truck. I tested the inputs on the module from the info in alldata. I then conde...
2002 Saturn LW200 2.2L MIL Lamp on VIN: 1G8JU84F02
Extracted PO440. Can operate both purge and vent solenoids with brick scanner. Getting plenty of vacuum through purge solenoid when commanded on. System holds vacuumwith both solenoids commanded on. Releases vacuum when vent solenoid is commanded off. FTP sens... Trouble codes: P0440

Fixes & Summaries for GM
Fix/Summary Answers
2008 Buick Enclave CXL 3.6L sir VIN: 5GAER237X8
after talking to ac delco's tech line I had to send this one to the dealer.The dealer tech couldn't program it either so he called gm's tech support.I spoke to the dealers tech,he said that the engineers at gm told him that there're 5 modules that have to be p...
1999 Cadillac Escalade 5.7L Control Head VIN: 1GYEK13R1X
Sort of fixed. We did put a high pressure switch in compressor, tracked light green wire back to bulkhead connector, tracked dark green wire back to PCM, and still popped another control head. Internal diagrams of control head are flat out incorrect out of ALL...
1967 Chevrolet camaro rs 327CID headlights wont close VIN: 124677N212
the prolem was under the dash. The diode was faulty and replaced. To check if it was bad I bypassed it and all worked fine. Thank you for all your help
1997 Chevrolet S10 LS 4.3L Hesitation VIN: 1GCCS19W4V
Found fuel pump to be bad,after running 10 minutes or so the pressure would fall to below 20 psi.replaced with another new one and solved problem Trouble codes: P0131 (o2 sensor bank 1 sensor 1 low voltage).
1998 Chevrolet Lumina 3.1L compressor VIN: 2G1WL52K39
Thanks Gentlemen, that was all good advice from all of you, i think i have come to the conclusion to skip on the re-sealing, like we said,i dont want to marry this job, and have a come back, thats like a ding on your credit score, you may not loose them, but a...
2003 Chevrolet Corvette 50th Anniversary Edition 5.7L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G1YY32GX3
Here's the state of this "problem child" vehicle. For various reasons, the engine was put back to stock configuration. The problem was exactly the same. A GM field engineer was called in on the job and he pretty much repeated the testing that was done with ver... Trouble codes: P0300 (Random Misfire).
2004 Chevrolet Trailblazer LS 4.2L reduced power light VIN: 1GNDT13S94
Thank you for all your time and ideas. I fixed this trailblazer(with the help of you) by sending it to the dealer for a flash. My first problem was I was running last quarters verison on aldata, I insyalled my updates and the flowchart for P1680 was complet... Trouble codes: P1680 (Driver 5).
2005 Chevrolet Express 3500 6.0L abs module VIN: 1GBJG31U95
1996 Geo Tracker 1.6L lack of power VIN: 2CNBJ1866T
I would like to thank all that took the time to respond. Charlie and Ron were exactly right. The keyway on the crank pulley was spun. It sure felt to me like valve timing the way that it run, but all the timing marks were on. Fuel trim and sensor readings ...
2002 GMC Envoy SLE 4.2L Exhaust valves VIN: 1GKDT13S52
Cylinder head was sent to the machine shop for 12 new exhaust valves and 1 new intake valve. Replaced timing cover, oil pump, and pickup with 'new' design. Vehicle runs very well and customer is happy.
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