× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 7, 2005
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Custom 3.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G4HP52K2W
Thank you in advance for your. This car came in with Check engine on and code P0303. The customer stated when the car was cold the engine would run fine after 20 minutes or more of driving the car would act up. I tested the output of the coils with a screw typ... Trouble codes: P0303 (misfire cyl 3)
1995 Chevrolet K1500 Suburban 5.7L No Start VIN: 1GNFK16K3S
This truck was towed in for a no start. customer stated that when ever it rained or snowed the truck would not start. The fuel pump was not being energized. There was good voltage at B1 of the fuel pump relay. The truck would start and run if the fuel pump pri...
1996 Chevrolet Blazer 4.3L Hesitation, Misfire VIN: 1GNDT13W8T
Can't seem to figure this one out. Customer states that around 65-70 mph it will misfire and stumble. Freezframe data shows largest miss of cyl #5 the rest are less than 20. This has a linear EGR and no code for it so that isn't sticking. All of the repair his... Trouble codes: P0300 (Random engine misfire)
1999 Chevrolet Silverado 1500 5.3L no fast idle VIN: 2GCEK19T3X
started cold this morning, no fast idle rpms low, modis monitor shows (cold start no) does anybody know what this means or how it is checked. also no codes, I could not find a iac relearn procedure in modis. am going to replace fuel filter and clean mass air f...
2001 Chevrolet S10 2.2L hard start VIN: 1GCCS14501
Customer brought truck in said he had a hard time starting. long crank time and when it did finally start it backfired. Dosen't happen all the time but dose happen regularly. Started fine this morning has check engine lite on he forgot to mention. pulled code ... Trouble codes: P0178 (fuel compensation sensor curcuit input to low)
2002 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23192
Vehicle towed in , died driving down the road, has had extensive bodywork previously from rollover. vehicle drove fine after body repair completed until dieing. scan computer code p1631 fuel enable problem using tech 2 scanner checked for proper vin # , vin # ... Trouble codes: P1631 (Theft deterrent fuel enable signal not correct)
2003 Chevrolet Express 3500 6.0L Cuts out, Stall, MIL Lamp on VIN: 1GBHG31U23
Van came in as stall on road intermitently. pulled codes with mt2500 and got P0130 - fuel control circuit problem. Ran vehicle for 10 to 15 minutes and stalled 4-5 times, would restart after each stall. Took Movie snapshot of stall occuring and found igntion 1... Trouble codes: P0130
1994 GMC K1500 Suburban SLE 5.7L Instrument cluster guages VIN: 1GKFK16K6R
On this truck, the guages will pulse along with the flashers. All guages seem to be working properly, with the exception of the voltmeter, and the oil pressure guage. The wipers will not stop running either. If you unplug the wipers it makes no difference on h...
1994 Pontiac Grand Prix SE 3.1L dome light VIN: 1G2WJ52M4R
Help. A customer brought in there 1994 Pontiac Grand Prix SE with the complaint of the dome light staying on for as long as 2 hours after the they get out of the car. I researched the system and found that there is a delay of approx. 16 seconds before the dome...
1996 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE52MOT
Hello All, I have a Grand am thats giving me fits. It started as a hard start condition. It was toed to my shop. Once inside I got it running, it had a very extended crank time. Got it started, moved it on to a hoist, suspecting fuel problem.Put a fuel pressu...

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick Regal GNX 3.8L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1G4GJ1179H
cust has no money to let me diagnose further. i can never reach him and he has car abandoned at shop. as soon as he shows ill post a message again.
1990 Buick LeSabre 3.8L Hesitation, Misfire VIN: 1G4HR51C8L
Thanks to all who replied. Although I have checked grounds and power wires to just about everything, it suddenly dawned on me that the TPS might just cause this problem, what it has to do with the radio I just don't know, so i changed it and the car ran great ...
1991 Buick Skylark 2.5L Poor Idle Quality VIN: 1G4NV54UXM
Wow!!! Why do I over think stuff at times. If it acts like a duck, walks like a duck and quacks like a duck then it's a duck. First the fix, then the replies and then some comments. The timing chain had jumped a couple of teeth. When you accelerate and you g...
1984 Cadillac Seville 4.1L blower fan VIN: 1G6AS6983E
the problem turned out to be the blower power module located in the heater box close to the blower motor but towards the drivers side on the heater box - firewall area. i had plugged a test unit in early on in the test process (and yes i did ground the ground ...
1994 Cadillac Seville SLS 4.6L reverse VIN: 1G6KS52Y3R
With thanks to all and extra thanks to Mr. [...], this one is fixed and without removing the transmission. We pulled the pan and found the manual link bent and tangled in the transmission wiring harness. After an hour or so of straitening and saying how the...
1995 Chevrolet K2500 Cheyenne 7.4L MIL Lamp on VIN: 1GCGK29N3S
Hello fellow techs:I had alot of responses.I never could find a vac.leak so the idle did stay high 150rpm's The idle set screw had not been messed with.I'm thinking i have a slight manifold leak but customer did'nt want to fix it.Thanks to Glenn who explained ... Trouble codes: 36 (isc actuator error).
1996 Chevrolet Blazer 4.3L Misfire, MIL Lamp on VIN: 1GNDT13W2T
Sorry about the mixup guys, I should have posted this as a fix instead of an update. This blazer is running great.Thanks so much for the help. Trouble codes: P0340 (cmp sensor curcuit), P0300 (multiple cylinder misfire).
1998 Chevrolet Corvette 5.7L Blend Door VIN: 1G1YY226W5
Well this one is fixed. We were hesitant about throwing parts at this car because everything is very expensive for the hvac system. We replaced the control head. We cleared the code and disconnected the battery. The system will do a calibrate and self-test wit...
1999 Chevrolet Malibu 3.1L Poor Idle Quality, MIL Lamp on VIN: 1G1ND52J0X
Thanks to all for the quick replies. I forwarded the information to the repairing shop and they agreed the symptoms were injector related. Replacing 6 injectors kept the MIL off and greatly enhanced the overall performance, was the reply. Trouble codes: P0300.
2003 Chevrolet Silverado 3500 6.6L Guages VIN: 1GBJC34123
Thanks to Aran [...]. All replies were right on the money. By cleaning the EBCM ground on the frame rail, next to the left wheel well cured our problem!
1997 Pontiac Trans Sport 3.4L abs VIN: 1GMDX03E6V
A very helpful suggestion that would have been my next move would be to run a dual trace on a lab scope for the front and rear sensors at the module to see if the anamoly is induced to the sensor wiring or the module.
1998 Pontiac Trans Sport Montana 3.4L air bag VIN: 1GMDX03E5W
Thanks to all of you that replied this was an easy fix. I checked all the connections for corrosion and none was found then replaced the seat belt buckle and pretensioner which has fixed the problem. only GM could figure out a way to make a 100 dollar seat bel...
2000 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Idle Quality, Cuts out, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G2NF52T6Y
HELLO- i will close this without me fixing as when i posted the help request- the owner asked if she could take it home until i got the requests- she said she would then bring it back for me to fix- it never came back- i found out it went to a friends shop, an... Trouble codes: P0303, P0300.
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next