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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 13, 2006
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Open Help Requests for GM
Help Request Answers
1990 Buick Electra Park Avenue 3.8L Engine & Lights VIN: 1G4CW54C7L
Hello all, Thanks for checking my request. This car has several problems. The engine starts ok. Then when the key is turned off it doesn't shut off. Pulling the PCM fuse shuts it off. When it is off the headlights flick on and off and the dash guages jump a l...
1991 Buick Skylark 3.3L Poor Idle Quality, Hesitation, Surge, Stall VIN: 1G4NV54N4M
hello guys im back with another gm. this one come in with a stalling and rough idle complaint. performed ign service plugs and wires that were crossfiring which took care of the misfire and stalling. but at idle it still rough. checked for vacuum leaks and fou...
1987 Cadillac Cimarron 2.8L dash instruments VIN: 1G6JG51WOH
Dash lights blink and gauges flash and do not read correctly. We replaced the ECM. Problem went away for 3 days then returned. We then replaced the ECM and the PROM. All went well for a week. We have reconnected ground wires and added new ground wires. This ha...
2000 Cadillac DeVille DTS 4.6L no start, no guages, nor door locks, no power wind VIN: 1G6KF5792Y
This car came in Friday on the hook as no crank/start. Upon turning the key on I noticed the warning lamps on the dash came on, but the guages do not work. Upon further investigation I realized I had no power windows, no power locks, and no radio. I plugged my...
1989 Chevrolet Corvette 5.7L rack? VIN: 1G1YY3183K
this car came into my shop from a dealer who took it in on a trade...so i have no repair history on this car. the complaint is the car has no turning radius. from center you can only turn the steering wheel 3/4 turn left or right before the rack and pinion bot...
1992 Chevrolet K2500 Cheyenne 5.7L No Start, Poor Idle Quality VIN: 1GCFK24K6N
good evening everyone. I have a friends 1992 Chevy K2500 4 wheel drive pickup with the 5.7 (350) engine. It came to me by way of a co worker from the local Ford Dealer who replaced the intake manifold gasket due to a coolant leak and the ignition module 'cause...
1994 Chevrolet K3500 6.5L No Start, Stall VIN: 1GCHK39FOR
truck starts and performs ok cold -after setting somtimes it will not start let it set 20-30 minutes it starts and runs fine and then repets itself'thanks for any ideas that may help new fuel filter no help maybe air in system somwhere but dont know any normal...
1998 Chevrolet Express 1500 5.0L No Start VIN: 1GCFG15M5W
Vehicle originally towed in as no start. Found vcm split, replaced,flashed, relearned. Vehicle left running & no Mil. Determined OE vcm at fault through wiggle testing harness & tap testing vcm. Crank/no start- cold engine. Can anyone point to the vcm pin numb...
1998 Chevrolet Cavalier 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G1JC5245W
this car came to shop with a running rough @ idle complaint. opened & closed egr using active commands with scan tool and could make car run reasonable. data stream on scan tool however still indicated egr position to be at 26% while desired egr was 0%. tapped... Trouble codes: P0404 (egr valve pintle position open), P1404 (egr valve closed pintle position)
1999 Chevrolet Express 3500 5.7L Power Window VIN: 1GCHG39RXX
This van has a problem with the Driver's Window, it always goes down OK, but at times it won't come back up until you let it sit for a few minutes. Have tested extensively and have found that the "Express-down" feature doesn't kick out when the window get to t...
1999 Chevrolet Tahoe LS 5.7L lack of acceleration VIN: 1GNEC13R9X
hi guys and gals, boy it seems i get the odd ones...heres my story...vehicle came in with lack of power complaint.. customer says it wont accelerate...first test was the fuel pressure...68 psi koeo and holding.running @58 psi checked timing it is ok...checked ... Trouble codes: P0420, P0430
2000 Chevrolet Corvette 5.7L driver power window VIN: 1G1YY32G8Y
This customer said he took the vehicle to a tire store to get a tire repaired and window wouldnt go back up coincedence ? probably but what we are finding is the left door module is spitting out a b2284 Battery #2 fault LDCM if you clear the code it comes righ...
2004 Chevrolet Impala LS 3.8L instrument cluster VIN: 2G1WH55K64
hI again about this same vehicle-replaced ipc with reman unit again-everything worked fine (no low fuel light lit constantly).during test drive cluster went dark\gauges to zero only the check engine light comes on as it should & goes off with engine started.bo...
1998 GMC Safari SLE 4.3L Misfire VIN: 1GKDM19W0W
HI guys I have this van that seems to miss fire just before the vehichle shifts .It seems more noticable under light load.It all started after a emission test.The customer brought it in and a tech called a complete tune up .this did not fix it so another tech ...
1990 Oldsmobile Delta 88 Royale 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G3HY54C1L
Hello, i am hoping that somebody can give me some help with this, car comes in with very bad hesitation, almost undriveable. Scan car, come up with code 41 for cam sensor, and code 42 for est circuit. Replaced cam sensor, and checked wiring first, didnt make ... Trouble codes: 41 (cam sensor fault), 42 (electronic spark timing circuit)
1996 Oldsmobile LSS 3.8L Stall VIN: 1G3HY52LR4
High all in IATN land. This car came to me from another shop where the cam and crank sensors were replaced. It did have a cam sensor code in it when it arrived, but has not returned. I have lab scoped all circuits at the ignition module and all are ok at this ... Trouble codes: B1021 (TFE Malfuntion)
1992 Pontiac Sunbird SE 3.1L MIL Lamp on VIN: 1G2JB51T2N
o.k. gm techs i need your help. i have replaced the manifold air tempreature sensor. (old one was out of of range) verified five volt refrence signal, and ground wire o.k. verified all wiring between pcm and sensor. o.k. new mat sensor is within specified rang... Trouble codes: 25 (manifold air tempreature sensor signal voltage low)
2001 Saturn SC2 1.9L Hesitation, Surge
cust said had a stumble off idle and a stumble on decel I did the service he asked for and I listed the car has had no repair history just oil chages this started to occur just recently I also tried a map w/ the same symp.
2003 Saturn Vue 2.2L mil VIN: 5GZCZ43D93
I never seen this before. The costomer came in with "service engine soon" light on. I put it on the scaner (Snap-on Brick) I got no codes. I went to history, No codes, I went to transmision,-No codes, next ABS-no codes then SRS-no codes. At this point I figure...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Skylark Custom 3.3L No Start VIN: 1G4NV54N5P
After much debate I found that the Alldata wiring diagrams were wrong and I had been chasing the wrong wiring. I did find that the aftermarket alarm had burnt some of the wiring to the ignition switch accessory side. Once that wiring was repaired and a new cra...
1998 Buick Century Custom 3.1L long crank to start VIN: 2G4WS52M8W
Hello everyone this 1 isnt fixed yet. Car is running everyday and will have back in the shop in a week or 2 wen the cust has time to park this thing. I checked many things like all yaw said checked fuel bleed off that was ok checked and replsaed crank and cam ...
1990 Chevrolet K1500 Cheyenne 5.7L speedometer VIN: 1GCDK14KOL
Hi Everybody. After a fewe hours of testing and diagnosing I have finally figured out what was wrong with the speedo. Thank you Matt and Dave for your info on the ground wire. It had good continuity to a good ground source. To Ralph [...] checked the waveforms on ...
1995 Chevrolet Lumina LS 3.4L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 2G1WN52X1S
Sorry for the delay. The fix was new computer(of course, factory remanu). Somehow the aftermarket computer has a lot of problem. Thanks for your time for helping on this. Trouble codes: 1640 (Quad Driver A Error), 1650 (Quad Driver B Error).
1997 Chevrolet Lumina 3.1L starter VIN: 2G1WL52M7V
First of all I would like to thank you all very much. Espcially Karl and Glen of New Jersey they gave me alot of information that really helped to fix this problem job. It was the Gm Passkey system. Karl was the one that gave me the most help understanding the...
2000 Chevrolet C2500 6.5L Dies VIN: 1GCG29F3YF
2003 Chevrolet Malibu 3.1L Steering Rack VIN: 1G1ZS52F34
Thanks again for all the helpful replies, it looks like David from PA hit the nail right on the head with his reply concerning a bulletin from GM which is as follows: From: David from Pennsylvania Date: 03/10/2006 16:56:48 This may apply to your vehicle. Kno...
1992 GMC Jimmy SLE 4.3L Surge, Stall VIN: 1GKCS13W6N
well it's fixed. thanks to all you folks. a lot of you said to look at the distributor shaft/ magnet. when i did, i found it cracked so i replace it with a used one i had laying around. guess what, it got worse. that told me that i was on to something so i ord...
1994 Pontiac Sunbird SE 3.1L Excessive Emissions, Poor Idle Quality, Stall VIN: 1G2JL14T8R
Sorry I havent replied sooner but seeing as the vehicle only acts up on cold days (20F or below) and it has been abnormally warm here (35F+) in buffalo, (yes, buffalo) this winter, after the last posting (and a major PC malfunction), the car hasen't acted up. ...
1995 Pontiac Grand Am SE 3.1L speedometer VIN: 1G29W55M8S
Fix was to run two new wires to the vss. Couldn't see where the wires were bad and it passed continuity test and wiggle test. I read in the manual under troubleshooting tips that wires can pass a continuity test but still not allow the signal through. Interest...
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