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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 6, 2004
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Open Help Requests for GM
Help Request Answers
1990 Buick Reatta 3.8L door ajar indicator VIN: 1G4EC33C2L
Good day fine techs: This Reatta shows door ajar message when shifting into reverse or drive or the other gears. It won't do it with the key on only. Engine must be running for indicator to turn on on dash. Scanner shows code 47 (UART). I got no info available...
1995 Buick Riviera 3.8L engine VIN: 1G4GD2218S
Engine has a dull knock at idle and in gear.Sounds like rod bearings but doesn't rally get worse when acceleraring.Anyone ever come across same noise ? Any help would be appreciated.Will be removing oil pan to check rod bearings tomorrow so any advise would be...
1996 Cadillac Eldorado 4.6L Climate control Display/Driver information center VIN: 1G6ET1291V
We have a weird one here! There is no illuminated display on the climate control head but it still works fine. You just can't see the green numbers or signs, also No information display on inst. cluster nor a tach signal, fuel guage or coolant signal. All othe...
1996 Cadillac DeVille 4.6L Misfire, MIL Lamp on, Misfires at cold sta VIN: 1G6KD52YXT
This is my wife's vehicle and we have had it since it was new. It has a long history of loosing coolant. It is believed all leaks have been repaired.The engine has never heated above normal. The problem is misfiring at cold start up. This began several months ... Trouble codes: P0300 (Multiple misfires)
1986 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY078XG
This car is about to make me quit the business and become a hermit! any and all help/suggestions will be gratefully accepted. This 86 Corvette was in for an intermittent no start stall problem. I found that the fuse link that supplied KAM power to the pcm and ... Trouble codes: 36 (MAF sensor burnoff function fault 5.7 Y)
1987 Chevrolet Cavalier 2.0L Excessive Emissions, Poor Idle Quality, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1JC1112H
OK! So it gets dragged in to me and after about 4 hours I get it to at least start and run under its own power, and herein lies the problem...LOL. For starters the MIL light is on constantly and you can not pull codes. If I unplug the yellow connector on the e...
1992 Chevrolet Corsica LT 3.1L Poor Idle Quality, Surge, Stall VIN: 1G1LT53T5N
Car ran like a basic problem, surged and died on startup could keep running if kept foot on the throttle. Replaced plugs and wires and cleaned induction did not help-. Found there was a prom update put in no help. Due to age and factory coils replaced them and... Trouble codes: 35 (ais motor replaced and still sets)
1994 Chevrolet S10 LS 4.3L Misfire VIN: 1GCCS19W2R
What a headache, the fuel pressure is between 52&53 psi. Shop key specs. say 54-64. I read somewhere that even 56 is kinda low for this system. Does anyone have a lower limit? Long term fuel trim is going between 142-152 at 1500-2500 rpm. with no load on the e...
1996 Chevrolet Corvette 5.7L 2-3 Shift / OD VIN: 1G1YY32P0T
Yes, I have checked fix DB but ended up with more questions than answers. I have been repairing the craziest problems MB, BMW, Porsche has ever conceived but hide from GM when possible, so pardon the GM ignorance! Came in acting as if kick down cable (if it ha...
1999 Chevrolet Astro 4.3L trans solenoid VIN: 1GKEL19W3X
Van came to us after local trans shop replaced shift solenoids and wiring harness inside trans for code p0785-we ran tests for this code and replaced pcm.code p0785 still sets-we ran a new wire for 3-2 solenoid from pcm to trans-still sets code!!!-has anyone s...
2000 Chevrolet S10 2.2L No Start VIN: 1GCCS1442Y
Hi Group, Truck came in on hook.Will not crank.Can jump starter across,will start & stall.Turning key on will make gauges & warning lights work but will not start truck.This has to be something with the security system we think.Security light will come on but ... Trouble codes: P1041, P1870
2000 Chevrolet Blazer LS 4.3L No Start VIN: 1GNDT13W6Y
Had the vehicle towed in for a no start.Did basic tests and found the vehicle had no fuel pressure. Called customer to tell her the results. She informed me this would be the fifth fuel pump within the last few months.Of course I asked her if she routinely run...
1997 GMC Savana 3500 5.7L Hesitation, Surge, Misfire VIN: 1GTHG35R4V
Help GM techs! This GM van has a sag/hesitation/missfire on acceleration(pops back through the intake)It occurs for less than 60 seconds on every start-up. During this time, vehicle will barely pull off from a dead stop. As soon as it goes into closed-loop,it...
1990 Pontiac Grand Am LE 2.5L Hesitation, Cuts out, Misfire, BACKFIRE THROUGH TB VIN: 1G2NE14U4L
Hello fellow Techs. This one is about to drive me over the edge. I mainly work on Ford and Asian so I am at a loss. this one belongs to me so I have tried some "Shotgun Diagnostics." A day or so ago it started cutting out, back firing through the throttle body...
2001 Pontiac Grand Am SE 2.4L Stall VIN: 1G2NE52T91
I inherited this from another mechanic. The complaint is that it will intermittently die. You then crank it without turning off the key and it will not start. If you turn the key off and then crank it, it will start. I have verified this. The other mechanic sa...

Fixes & Summaries for GM
Fix/Summary Answers
1986 Buick Electra T-Type 3.8L No Start, Cuts out, Stall VIN: 1G4CF69B8G
Great many responses to my problem. Most suggested crankshaft position sensor. I replaced it but no help. It turns out that my [know good part] ign. module was not so good. The problem got bad enough to fail in shop regularly enough for diagnosis without a tow...
1990 Buick Park Avenue 3.8L PRNDL Decoder VIN: 1G4CW51C9L
Customer says that the PRNDL light is behaving itsself now, and with that, I would say a possible problem exits with the wiring or connector at the transmission switch. Anyways, this one is closed for now. Thanks to all for your time and responces. Ron
1991 Buick Park Avenue 3.8L battery VIN: 1G4W53L1M1
thanks for all the quick responses guys, those of you that guessed the radio where right. the clock led was staying powered up. a special thanks goes out to g.c. [...] who sent us one of the most helpful and detailed letters ive seen in years.
1996 Buick LeSabre Limited 3.8L a/c air controls VIN: 1G4HR52K8T
Many thanks to all who helped, everybody was on the right track. All said the problem was with the vacumn system. Larry [...] hit the nail on the head. The vacumn harness connector at the programer was leaking causing the upper door actuator to not open. Larry ...
1996 Buick Century Custom 3.1L Hesitation VIN: 1G4AG55M0T
After finding the mass air flow meter to be functioning properly, I removed the EGR valve to check the passages. I did not find any debris in the valve but I proceeded to clean the valve seat anyway. I was fortunate another technician had a known good EGR valv...
1990 Cadillac Brougham 5.7L Stall, MIL Lamp on VIN: IG6DW547XL
i finally fix this thing. thanks very much to all the tech who take time to reply . almost veryone tell me it is dist problem, but one thing i did mention that after engine stall the cruise controll transducer move throttle linkage back and for repeatedly.i re... Trouble codes: 42 (43 -), 43.
1994 Chevrolet S10 LS 4.3L Misfire VIN: 1GCCS19W2R
Thanks to all who responded. The fuel injector assembly was leaking fuel into the right side of the plenum as this side was very clean where the fuel had washed it clean. The base timing is set at 0 deg. TDC and with the correct spark module Napa TP25, the spa...
1996 Chevrolet S10 LS 4.3L 1-2 4 VIN: 1GCCT19WXT
I recieved some good replies and from Ron [...] a page from Trans doctor software with related fixes. 1) Check for code 82 (1-2 'A' solenoid fault) - defaults to maximum line pressure and either 1st & 4th only or 2nd & 3rd only 2) May be caused by a bad...
1996 Chevrolet Tahoe 5.7L left front output shaft diff)
I put this truck back together.I could NOT get the output shaft out. This has got to be the lousiest set up ever. I did everthing but throw that thing up in the air.I found a used diff for 300 bucks but do not know what the owner will say. Responces were encou...
1997 Chevrolet Malibu LS 3.1L engine, camshaft VIN: 1G1NE52M6V
Thanks to everyone for all the replies, We have seen this problem before and know that the engine has to be replaced, I was just hoping that there was some documented confirmation of this problem because this is a very difficult customer. Thanks again for all ...
1998 Chevrolet K1500 Cheyenne 5.7L 4wd VIN: 2GCEK19RXW
Thank you Chuck,David and Andrew your replies were right on. the encoder motor was the proper fix.I made sure first that i had power and gnd.(red and black wires) thanks again Stace
1996 Geo Metro LSi 1.3L MIL Lamp on VIN: 2C1MR5294T
Thanks to all responders, especially Douglas from North Carolina who asked me to question what I was seeing on the scantool further. Turns out the root problem was damage to the 15 amp TAIL FUSE circuit which provides 12V hot at all times to the OBDII connecto...
1994 GMC Jimmy SLE 4.3L Hesitation, Cuts out, Stall, Dies at idle VIN: 1GKDT13WXR
Thanks to all that helped out with this one. I stumbled upon the answer by accident. A freind of mine brought his scope meter over to get a waveform on the injector unit. While backprobing the harness the car would die. After further inspection I found the fem...
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