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Prev Professional Automotive Repair Technical Discussions for May 25, 2007
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Open Help Requests for GM
Help Request Answers
1996 Buick Century Custom 3.1L Poor Idle Quality, Hesitation VIN: 1GAG85MXT6
runs ruff for 30 seconds and almost stalls at a standstill one minute after cold start then will run fine all day. i also noticed that if you stomp on it in reverse the motor cuts in and out. customer thinks it is "starving for gas"
1994 Chevrolet K1500 6.5L MIL Lamp on VIN: 2GCEK19S3R
Please help. We are familiar with how this system works. The problem is that with the "Slodis" hooked up and monitoring data, with the BAP sensor on firewall plugged in, key on, engine off, voltage reads 4.94 = no problem. When you unplug the sensor, then key ... Trouble codes: 33 (EGR Control Pressure/Baro Sensor Circuit High Low Vacuum)
1995 Chevrolet S10 LS 4.3L Torque convertor VIN: 1GCCT19W6S
The new convertor is squeeling now. My question it there something we overlooked or did we get a bad convertor.
2000 GMC Yukon XL 1500 SLE 5.3L Transfer case VIN: 3GKF16T8YG
Hello Group. Vehicle came to us with transfer case shifting in-op. ATC fuse blown. No com with TC module. Installed 15 amp circuit breaker, now have com and a C0387. Circuit breaker trips during shift attempt. Replaced shift motor (we had a new one). Cleared c...
1997 Oldsmobile Cutlass Supreme SL 3.1L Misfire, MIL Lamp on VIN: 1G3WH52M7V
Car came in with misfire code po302, found #2 plug shorted, rplaced all plugs, wires, test ran now has code po300 random misfire all cylinders except #4 showing misfires with # 2 with the most, replaced injectors with good used ones due to customers budget, mo... Trouble codes: P0300
1966 Pontiac GTO 396CID Heater VIN: 242176K122
I need to replace the heater core on this one and cannot find any repair information. Does it require removal of the right side inner fender to get at the heater case mounting fasteners? It does not have air conditioning. Thanks, Bob
1989 Pontiac Firebird 5.0L drive line VIN: 1G2FS21E2K
This car has a vibration in the drive line at 80mph, it clears up at a higher speed and not evident at a lower speed. I have checked the motor mounts and trans mount. The ujoints seem fine, the dirve shaft has no marks from being hit and the rear bar connectin...
2001 Pontiac Grand Am SE 3.4L Theft Deterent VIN: 1G2NF52E51
I know in GM we see the B2960 (Passlock incorrect but valid)often. We'll I've got one that's been a real pain. I'm kind of buried in someone else's mess. This vehicle was in several months ago for a no start. It had a B2960 stored in the BCM relating to the v...

Fixes & Summaries for GM
Fix/Summary Answers
1986 Cadillac DeVille Touring 4.1L vacuum pump VIN: 1G6CD6988G
thanks to all that replied. i ended up having local parts supplier send in my pump for rebuild.pump is at rebuilder now and i was told it is rebuildable so i'll see what happens.
1990 Cadillac DeVille 4.5L Cruising by itself VIN: 1G6CD5338L
Base idle adjust to 550rpm, after warm up adjust TPS parameter to 2.5, disconnect battery, ISC relearn. Car runs & idles great, thanks to everyone for supporting, especially thanks to JUAN. Thanks...
1995 Chevrolet Lumina APV 3.8L Stall, MIL Lamp on VIN: 1G2HX52K25
Well chris from indiana put me in the right direction about checking the purge valve,i checked to see if i had voltage to the valve and found there was no power .So i started checking the wiriing and found it had shorted to ground,so i repaired the wire and ch... Trouble codes: 1430 (Quad driver 1), 1470 (Quad driver4).
2000 Chevrolet S10 2.2L Poor Idle Quality, Misfire VIN: 1GCCS1943Y
Thanks to all that offered help. As it turn s out the ecm was bad. we had to send to dealership to replace because they had to reprogram it Trouble codes: P0200.
2002 Chevrolet S10 2.2L Cooling System VIN: 1GCCS14562
Hey guys!!! Sorry for the delay, I have had other cooling system failures that have slowed the process down. I have just got enough hours on the coolant to get an accurate sample and am waiting for that info. I have involved an chemist and engineer that we hav...
2004 Chevrolet C4500 Kodiak C4C042 6.6L No Start VIN: 1GBC4C1104
to fix this vehicle I found that someone had put the fuel/water seperator with channel locks and put a small hole in it. It would lose prime and not start and also when putting in a new or reman dash the computer has to be flashed for everything to work right ...
1995 GMC C1500 Sierra SL 4.3L NO Spark, Fuel VIN: 1GCEC14Z9S
Just yesterday I talked to a person and he told me to check the stearing columb and or tilt the steering wheel a couple of times untill you see the lights in the dash come on and then start the truck (its a common problem in Trucks) and you know to my surprise...
1995 Pontiac Firebird Formula 5.7L No Start, Stall VIN: 2G2FV22P7S
thanks to all who replied, replaced the opti-spark dist with one from the dealer and the car has not had any problem since. time will tell, as for the vent hoses they were checked and found to be in good working order. Thanks again for the input.
2000 Pontiac Bonneville SSEi 3.8L MIL Lamp on VIN: 1G2HZ5419Y
Thank you Robert, Andrew and Doug for your suggestions. Unfortunately the customer decined additional diagnostic work before we were able to repair the vehicle. Robert mentioned checking the leak detection pump vent valve may be leaking internally,letting off ... Trouble codes: P0440.
2000 Saturn LW2 3.0L MIL Lamp on, P1511 VIN: 1G8JW82R9Y
In this case it seems that cleaning the carbon buildup out of the throttle body and plate allowed the throttle control to operate freely. The car has been driven daily for almost a week and all seems well. Thanks to all who replied! Trouble codes: P1511.
2003 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63B42
I had three quick replies to this one. All three recommended replacing throttle body first and then wiring harness if problem returned. This Saturn, having had the stat replaced and VC gaskets replaced by the dealer, has cost the owner a bit of change already.... Trouble codes: P0121, P0221, P2135 (correlation tp 1 / tp 2), P1779 (torque delivered signal).
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