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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 13, 2005
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Open Help Requests for GM
Help Request Answers
1995 Buick Regal 3.8L MIL Lamp on VIN: 2G4WB12L0S
cust complaint of check eng light, no current codes, vehicle has 16 memory codes, can not clear memory codes, tried replacing ecm and prom, checked powers and grounds all ok , vehicle runs fine, without running eng was able to clear all but 5 codes turn key of...
1991 Chevrolet Lumina Euro 3.1L Cuts out VIN: 2G1WN54T3M
This is one that can keep me humble. when it's cold, it has a stumble just off idle and it is also apparent at a medium to hard acceleration. when it warms up, it runs well. we tried a new prom from gm and it made things worse. we put the old prom back in and ...
1996 Chevrolet Lumina LS 3.1L Battery VIN: 2G1WN52M4T
Hello every one, hope someone can help me. Customer brought this vehicle to us months ago with a dead battery and ABS light on. When we brought the car in and checked it out, we found the new battery dead and a new alternator on. We jump started the car and i...
1996 Chevrolet Lumina 3.1L high idle VIN: 2G1W152M0T
car came in from another shop with complaint of intermittant high idle. the other shop replace idle speed motor and computer with no success. sometimes on start-up, engine will race to 3000-3400 rpms for as much as 30 seconds before stabilizing at 900 rpm. it ...
1997 Chevrolet Cavalier 2.2L no crank no start VIN: 1G1JF5244T
We have this 1997 chevrolet cavalier in here with an intermittant no crank no start problem. It has happend to us just once. We checked the starter, the battery, checked for codes from the computer, tried to check the bcm but kept on getting failure to communi...
1997 Chevrolet Monte Carlo Z34 3.4L timing chain VIN: 261WX12X0V
Hello everyone, I have put timing belts on a few of these and had no problem. This car in backfiring through the intake it will not start. It is out of time but I am not sure where. You can rotate the engine and align the cams all in time but the crank is not...
1997 Chevrolet Cavalier 2.2L hydraulic system VIN: 1G1JC5249V
my partner has this 97 Cav that has a fluid leak in the hydraulic clutch system...can't make it quit leaking. Has replaced the master cylinder, pressure hose (twice)from master to the slave cylinder, and the snap coupler. Has been apart several times, teflon t...
1999 Chevrolet Silverado 1500 5.3L No Start, VIN: 2GCEK19T8X
this vehicle starts hard after sitting, has 60 lbs fuel pressure, spark and injector pulse but cranks for a long time before starting. If you give it a shot of fuel it seems to help, after it starts it runs rough for a minute, once its running engine has great... Trouble codes: P0507 (idle speed high), P0300 (cdr misfire detected)
1999 Chevrolet C3500 7.4L Excessive Emissions VIN: 1GCDC5TTTV
Thanks in advance for any help. This truck came in for a smog inspection. Failed as a gross polluter for hc at idle. Engine runs good, no misfires. Could not find anything that jumped out at me. At idle the short term fuel trim is right around 0 both banks, go... Trouble codes: P0125, P0338, P0175, P1153
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNCS18W6Y
Vehicle was brought in for running rough and failed emissions. Upon looking at the vehicle I found that it still had all the original tune-up parts so they all got replaced ie... Plugs, wires, cap and rotor. After futher testing I also found that the Spider In... Trouble codes: P0302, P0304
2002 Chevrolet Venture LT 3.4L heat VIN: 1GNDXD3E52
The blend doors and temp controls seem to be working. Van is running at normal operating temp. Van doesn't seem to have a heater control valve. Anyone seen anything like this before ?
2001 Pontiac Bonneville SSEi 3.8L Stall VIN: 1G2HZ54111
i need a little help on this one. the complaint is the car stalls very intermitantly. she is just driving and decel to a stop sign when it stalls. has code p0336 stored in history, freeze frame has two records stored, both appear to be stall at decel. i am sti... Trouble codes: P0336 (crank shaft position sensor no 18x)

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue 3.8L anti theft system. VIN: 14CU5217V4
Hello from frigid Maine. and thanks to Harry, Daniel, Tony, Mike, Frank, Jim, Latif, Rickey, Andy, David, and a special thanks to Larry Z. for the schematic. this is what I found, this car had recently been at a body shop where the keys got switched with anoth...
1987 Chevrolet Camaro Sport 2.8L Misfire VIN: 1G1FP21S7H
I got numerous replies, thanks to all. Did a running compression test, as suggested, and it was OK. Also used smoke machine to eliminate vacuum leaks. Also pulled and checked EGR valve-OK. The suggestion of restricted exhaust did not make sense to me, as only ...
1990 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54T6L
Thanks for all the replys. After I re-analyzed the data, I saw the problem. I had covered all the bases, the issue HAD to lie with the ICM, CKP, wiring, or power/ ground issues. Power & grounds were good. Known good ICM's (three) and CKP (two) were installed. ...
1995 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: 1GCFC24F1S
The replies I got led me to the problem. When I blocked the vacuum supply to the EGR the truck ran 90% better and did not clatter but still (Fat) I checked the air filter. It was stopped up.Shame on me I had replaced it some time ago but I guess I have to pay ... Trouble codes: 33 (EGR Controll pressure/ Barosensor circut Highlow vacuum), 99 (pedal position 2 / 5volt ref. fault.).
1997 Chevrolet C3500 Cheyenne 6.5L No Start, Stall VIN: 1GBKC34F4V
Thank you all for your help!!! This site is a great asset & you all are very professional. several people contacted me about a Service Bulletin #77-63-06A for the P1216 DTC and that is what fixed the vehicle. Instead of following the procedures for 'tilting' t... Trouble codes: P1216 (p0231-), P0231.
2003 Chevrolet Express 1500 4.3L Distributor VIN: 1GCFG15X93
We replaced distributor gear for a temporary fix. Customer would not let us dis-assemble engine to inspect. Sorry!!
2002 GMC Yukon XL 1500 SLE 5.3L No Start VIN: 3GKEC16T11
New pcm. Not communicting with bcm or any other module. Trouble codes: U1041.
1999 Oldsmobile Intrigue GL 3.8L MIL Lamp on VIN: 1G3WS52K5X
Thank you all for you help. The customer only wanted to pay a specific amount for the repair. So based on the information I recieved from everyone who replied I found that bank 1 was getting to much fuel, the fuel pressure regulator appeared to be alright and ... Trouble codes: P0172 (bank 1 too rich).
1999 Oldsmobile Bravada 4.3L steering VIN: 1GHDT13W2X
sorry it took so long to reply just waiting for the customer to return . as many stated the best way was to disconnect tie rods on the turn tables viola frozen lower ball joint (not very old)replaced all is well
1995 Pontiac Grand Am SE 3.1L all shifts VIN: 1G2NW15M35
Hey everybody, thanks so much for the great replies. I learned alot about these things from the info I got here. We ended up putting a trans in this car. It runs and shifts great now. I didnt disassemble it to see what failed exactly, but we now know that it w...
1997 Pontiac Bonneville SE 3.8L Auto climate control VIN: 1G2HX52K7V
I would like to thank aal those who responded! IATN is wonderful to have for these odd things. Kevin and David you called it. I put a batt in and still had the same thing, although ABS did go out after clearing the code. The actuator seemed to not allow the fu...
1998 Pontiac Firebird Firehawk 5.7L Oil Pump VIN: 2G2FV22G9W
Well guys I'm gonna call this a fix. This is what I found. 99% of you said oil pump or more specifically oil pump relief valve, so I started my journey based upon that. I pulled the timing cover first and boy, when I pulled that cover my heart sank...the old '...
2000 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HZ541Y4
I did go ahead a replace crank sensor, the new sensor did look better went up over the 6 volt range , thank you for all to helped on this one Jim Trouble codes: P0128, P0137, P0336.
2002 Pontiac Grand Am SE 3.4L passlock VIN: 1G2NF12E72
we replaced the ignition lock cylinder and relearn the passlock.we kept teh car at the shop a few days and it started right up every time we tried it. the customer is gonna let us know what happens. thanks for the help.
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