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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for July 28, 2006
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue 3.8L Starter VIN: 1G4CW5318M
Very intermit. no start condition. Everything powers up on dash but starter does not engage. You can jump the starter and car does start but does not stay running. I think it is the theft module but have no good way to confirm. The car only does this once or t...
1992 Buick Park Avenue 3.8L ABS light on VIN: 1G4CW53L6N
ABS light comes on when I first start driving vehicle. Scanner will not get codes to flash. Tried another scanner, same thing. All abs fuses are good. All sensors ohmed good. Seems to me that it would be a sensor if it does not come on until it starts moving b...
1994 Buick LeSabre Custom 3.8L Cuts out VIN: 1G4HP52LXR
Origionaly came in with a work order stating 'check for misfire'. Checked for codes and none found. Test drove and no trouble noted. Further discution with service writer/owner revealed that symptom only occured 2 or 3 times on drive from Oregon to central coa...
1994 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HR5SL4R
Vehicle came in with Hard Code PO342. Replaced ignition Module. OK for a few days. Now has VERY intermitent Code PO342. Replaced CAM SENSOR. No change. Still intermitent Code PO342.Can not duplicate when wiggling wires. Trouble codes: P0342
2000 Buick LeSabre Custom 3.8L tach,speedo prndl,odometer VIN: 1G4HP54K6Y
intermittently the i/p cluster will act up and all of the gauges will go haywire. on key up gauges appear to operate normal except prndl, which flickers. on start up all gauges go full sweep then reads except tach varies from 1500 to 3000 at idle(1000 rpm) spe...
2001 Buick LeSabre Custom 3.8L air bag VIN: 1G4HP54K81
Hello I got this park ave in with the air bag light on steady. I checked for codes and got a B0100 undefined code. I looked in the alldata but they had no info at all on this code, not even a definition. I checked the archives here at iatn but came up empty. I...
1997 Cadillac DeVille 4.6L Unknown VIN: 1G6KD54Y7V
Vehicle came in for a missfire when cold complaint. A tune up, motor vac,and intake clean cured the missfire problem we also removed about one quart of trams fliud from the overfilled transmission now the service transmission message is flashing code p0748. On...
2000 Cadillac Eldorado ESC 4.6L brake pedal VIN: 1G6EL12Y1Y
Customer complained of fading brake pedal, we felt it and replaced the master cyl. (Problem didn't change.) It will happen only when you back up several or just a few feet, the first time you brake going forward the pedal fades to the floor, the next and rest ...
1984 Chevrolet Corvette 5.7L wipers VIN: 1G1AY0781E
Wondering if you corvette experts can help me. Wiper motor is defective. Ordered new motor from GM. Replacement motor is same part number as original #[...]. The problem is the original motor has a two wire connector and the replacement has a three wire con...
2001 Chevrolet Express 3500 5.7L No Start, Poor Idle Quality VIN: 1GCHG39R31
we have replaced the cap and rotors 3 times now because of moisture in the cap.
2005 Chevrolet Silverado 2500 HD 6.6L 1st/2nd gear VIN: 1GCHK29275
We are a GM dealer and have gone over this 3 time with the tech line with no results the only thing we have not done is to replace the tranny ( need GM ok for that because this is warranty and he has had this problem since about 10,000KM Any ideas would be app...
2001 GMC Yukon Denali 6.0L Misfire, MIL Lamp on VIN: 1GKEK63U71
I did injector flush and cleared up misfire on cyl 1,7,8 cleared code and road tested great, later that day it returned with mil on and same code with different cyl's misfiring, pulled rails and found full of some kind of black sediment, curious about what mig... Trouble codes: P0300
1995 Oldsmobile Aurora 4.0L Cruise Control VIN: 1G3GR62C6S
Hello all. I have a hair puller. This 95 Aurora with Baby-Northstar came in with complaint of inoperative cruise control, no codes stored. Scan data doesnt provide much info on cruise control. Test drive verified cruise will set for approximatly 5 seconds th...
1999 Oldsmobile Aurora 4.0L headlights VIN: 1G3GR62C6X
help old's techs can not find this problem! the module relays click on and off on there own sometimes. they also work fine sometimes. it seems to be more when the car gets hotter but not all the time. i am leaning towards the ignition switch unless someone kn...
1989 Pontiac Firebird Trans Am 5.7L Poor Idle Quality, Surge VIN: 1G2FW2183K
this one's been a real nightmare. i replaced the engine and the car ran beautifully. had small oil leak at rear of intake maifold, so i pulled it and resealed. that is when the nightmare begins. the car now has a surge at 800 - 1200 rpm (sometimes at idle). it...
1996 Saturn SL1 1.9L Excessive Emissions VIN: 1G8ZG5289T
this car came to me from another shop with all these parts installed.car is running rich all the time.all sensors look good on scanner,fuel pressure is at specs. there is no leak down from injectors.ive removed the pcv hose from intake and the o2 doesnt change... Trouble codes: 656 (fuel level sensor), 132 (high voltage on oxygen sensor)

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick LeSabre 3.8L Poor Idle Quality, Misfire VIN: 1G4HP54C21
thanks for all the help.i found a small piece of magnet in crank reluctor ring.thanks agian for all the replies.
1995 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HR5215S
Thanks 'John from Kentucky', As you and I both suspected it was the ECM. Never did find schematic for 'passenger side under dash fuse and relay center'. Seems thy don't exist on any wiring diaghrams. Even ShopKey sent me the wrong ones twice. What made me thin... Trouble codes: 629 (invalid passkey frequency).
1994 Cadillac Eldorado 4.6L Instrument cluster VIN: 1G6EL12Y7R
Did not recieve much on replies for this one. But decided since ALL digital displays were not working and speedo. To replace the cluster. All displays are now working and the customer is happy.
1987 Chevrolet P30 Step-Van 6.2L Poor Fuel Economy, LACK OF POWER VIN: 1GCJP32J4H
I received a number of replies, some saying to adjust injection timing. Injection timing is ok, runs fine. This is just the way the vehicle was built, designed for local driving only.
1996 Chevrolet C1500 5.0L MIL Lamp on VIN: GCEC14W0VZ
Hi, to every co-iATN I would like to thank all those that offered help in one way of the other in fixing the GM truck I am working on. Tried all those tips and suggestions but never get to finish the job. The owner of the shop decided to junk the vehicle as ...
1998 Chevrolet Prizm 1.8L ignition lock cylinder VIN: 1Y1SK5235W
Thanks alot to all that replied, I started by tapping on the key while turning etc. could not get cylinder to turn, I decided to start using a punch on the lock pin, after a couple of light taps on the lock pin the key turned to the access. position so I could...
2000 Chevrolet Blazer LS 4.3L transfer case control module VIN: 1GNDT13W9Y
Lots of good help once again.Thanks to every one. Unfortunately it has stopped having this problem so the cust thinks it is fixed.I think and customer was advised that it will probably happen again.
1999 GMC Jimmy SL 4.3L Poor Idle Quality, Stall, Misfire VIN: 1GKDT13W7X
well guys it turns out that this jimmy had two problems causing the trouble, first fuel pump was not putting out enough pressure all the time. second someone had the distributor out prior to us getting car. even though the scanner said cam retard was 0 i check...
2001 GMC Sierra 2500 HD SL 6.6L Radio & entire I/P except oil pressure gauge VIN: 1GTHK23111
Thanks to automxi, Nicholas, Mike, John, William, & Michael for your replies. Well this one was a stumper but figured it out. Eventually found intermittent excessive voltage drop on circuit 340 between junction block fuse assembly input and instrument cluster ...
2003 GMC Envoy SLT 4.2L brake VIN: 1GKDT13S73
WELL guys i thank you for the info you gave me, let me say i feel silly for not hitting this one fast, it ended up being the master cylinder being bad, i replaced both frt wheel cylinders and the rh frt brake hose, i also replace the abs module valve, and fina...
2002 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WK52J32
Thanks to all that replied.This car is fixed.I carefully traced the main engine compartment wirring harness and found that were the harness runs between radiator and trans,and turns up toward firewall was laying against a/c accumulator and had rubbed four diff... Trouble codes: P0102 (Mass Air Flow Circuit Signal Low), P0141 (O2 Heater Circuit Bank 1 Sensor 2), P0443 (Evap Purge Control Circuit Fault).
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