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Prev Professional Automotive Repair Technical Discussions for December 2, 2011
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Open Help Requests for GM
Help Request Answers
1993 Buick Century Special 3.3L Excessive Emissions VIN: 1G4AG55N3P
Hey guys, Ok , ive got this 3.3l Buick with elevated nox at 15mph and 25mph.failing ASM here in CA. Around 1000PPM at both speeds.Intrusive catalyst test found less than 50 % reduction of Nox.Replaced cat 2 times with aftermarkets , same results. Fuel pressur...
1995 Chevrolet Tahoe 5.7L Hesitation, Surge, Cuts out, Stall, Misfire VIN: 3GNEK18K2S
Tahoe, Came no power under acceleration falls flat on face and seems to back fire sometimes out throttle body.Check spark out put and is good.Fuel pressure good.Did find #8 spark plug oil fouled and not firing cylinder was dead replace spark plug and cylinder ...
1999 Chevrolet Malibu LS 3.1L Starting VIN: 1G1NE52M6X
Engine turns over but has no spark, replaced ign module and crank shaft sensor cam sensor is working all fuses are good could it be the pcm thanks
2000 Chevrolet Impala LS 3.8L MIL Lamp on VIN: 2G1WH55K8Y
Vehicle came in with code, tested and found oxygen sensor wired incorrect. Install correct oxygen senor to no avail same code immediately. Tested circuit again and came to same conclusion, replace oxygen sensor. Replaced again with AC-Delco (as did originally)... Trouble codes: P0134 (B1s1 02 sensor ckt inactive)
2000 Chevrolet S10 2.2L Misfire VIN: 1GCCS1451Y
Vehicle came in severly overheated. Compression tested engine and leak down tested and found compression leaking in to coolant passages. When Coolant was low enough engine would run Good (no miss fires) and had strong spark in all cly. Replaced engine with a r... Trouble codes: P0300
2001 Chevrolet Silverado 2500 HD 8.1L Brake Pedal VIN: 1GCHC23G51
Hey guys! I need some help with this one. This truck came in originally for a intermittent soft pedal. Customer states that he would be driving, and when he hits the brakes, the pedal would go down to the floor, but if he pumps the pedal it will come back up, ...
2002 Chevrolet Avalanche 2500 8.1L No Start, Stall VIN: 3GNGK23G52
Vehicle died on highway, no start, fuel pressure reads 65psi, have changed crank and cam sensors. No codes with snapon scanner.Cylinder one fires when first cranked, then nothing after that. No others fire at all. The security light no longer flashes, maybe so...
2003 Chevrolet Silverado 1500 SS 6.0L Vent Controls VIN: 2GCEK19NX3
Hi, Thanks for reading my post. This truck blows the heat and air only out the defroster. I have checked the TSB for the wires at the back of the glove box and there is no wear there at all. The customer doesn't want to take the dash apart without knowing what...
2004 Chevrolet Silverado 1500 5.3L Instrument Cluster VIN: 2GCEC19T84
After Reprogramming PCM to install latest software updates, Could not reset tire pressure system to clear message from instrument cluster message center. Found tire pressure sensors had been removed from vehicle. Customer picked up vehicle and stated message w...
2004 Chevrolet Tahoe LS 5.3L Airbag VIN: 1GNEK13Z24
I have a very good customer's Tahoe in the shop right now with the airbag light on. DTC says B0026. Followed the GM TSB for connector terminal fretting on the airbag connector inside the driver side hinge panel. Soldered in the new connections, hard code comes...
2004 Chevrolet Optra 2.0L engine VIN: KL1JD62Z34
Before we start to open up things and second guessing ourselves,could someone shed some light on this. we have alldata and this vehicle does not show up,we were told same specs as Suzuki forenza. thanks in advance
2005 Chevrolet Equinox LT 3.4L Leaking r transfer case. VIN: 2CNDL73F05
This vehicle is leaking out the weep hole on the passenger side transfer case cover. Remove cover and there is an inner and out seal. I believe the oil is comming from the center shaft and possibly needs an O ring or something. Any chevy guys see this. I didnt...
2008 Chevrolet Colorado LT 3.7L Poor Idle Quality, VIN: 1GCDT13E68
Teh truck runs fine on cold start and driving. After the engine has been warmed up and shut off for 2 hours on restart the engine idle is very rough and low for about 1 minute [feels like engine is flooding] we have smoke tested intake manifold for leaks remov... Trouble codes: P0171
2005 GMC Jimmy SLS 4.3L o2 sensors VIN: 1GKCT18X05
I have a 05 Jimmy and when the truck feels like it turns on the engine light. It sets codes p0053 and p0059 heater resistance. truck came in with new 02 sensors, i have check resistance of wires to pcm with no problem and advise will help. Thank you in advance
2005 Pontiac Montana SV6 3.5L Stall VIN: 1GMDV23L45
Customer complains that the engine stalls a low speeds occsionally. Also, it occassionaly has extended crank and start stall symptom. The fuel pressure is 58 psi with pump running, the air intake system has no holes. Crank signal appears ok, although it is har...
2006 Saturn Ion-2 2.2L ignition VIN: 1G8AJ55F16
Customer has complained that vehicle wouldn't start in the morning. Difficult to extract as to what was actually happening (IE: starter engaging...key turning...) Must have started the car 150 times before the ugly green beast showed its face. Turn the key to ...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue 3.8L Engine/trans Vibration VIN: N0TAVAVA1W
thanks everyone for all your help. After reading about that bulletin where the rear/side mount for the transmission is i looked closer and found that the mount had been shifted. I loosened the two bolts that hold it in place and shifted the trans, retightened ...
2006 Buick Terraza CXL 3.5L abs VIN: 5GADV33L56
12 replies. Thank you, I actually feel kind of stupid on this one. I was so set that the problem was in the column that I just couldn't think of it being anythimg else. As most of you said, I did find the problem in the right front wheel sensor harness. The ha...
2000 Cadillac Eldorado ESC 4.6L inner cv boot VIN: 1G6EL12Y8Y
Thanks to the three people who responded to what I requested. Help with the two piece boot. I did not ask about reman or new axle replacement. I've been at this business for over 40 years and know about pricing of parts etc. What I failed to mention was th...
1995 Chevrolet S10 4.3L 4 wheel drive light blinks
Didn't get to work on this again yet. Had a lot of good info on the system & how it works. I think a bad part was installed at one point along the way.Thanks for all the replies. I will post again if & when we figure it out.
2000 Chevrolet Silverado 1500 5.3L Hesitation, MIL Lamp on VIN: 2GCEK19T8Y
Customer says truck runs great cold!!! Mass air flow and leaking intake gaskets. Used Costco borascope to look under intake when using smoke machine. Recorded video to show customer. Used link and volumeric efficency test to condem MAF. The scope has a detac... Trouble codes: P0101, P0161, P0463.
2011 Chevrolet Silverado 3500 HD LTZ 6.6L Excessive Emissions, Cuts out
Thanks for all support folks while I rant on! we went in to dealer today geared up for battle. Service manager listened to our complaint and wiped out all fees. I feel that going in with my dad,me having my name on my shirt may have helped ,but overall they k...
1998 GMC Savana 3500 6.5L No Start VIN: 1GDJG31F2W
Thanks for all your help on this one. It turned out to be the Mitchell manual and our Modis scan tool both had the wrong relearn procedure for this vehicle. After several attempts to relearn the Vehicle Theft Deterrent (VTD) by clearing the code, (P1631) cyc...
2004 GMC Envoy SLE 4.2L bad vibration VIN: 1GKDS13S04
Thank you all who replied! Most of you nailed it on the head, it was the motor mounts! I got a pry bar on the engine and the frame, and as soon as I put pressure, the vibration was gone. Two new mounts from GM, and all is well! Thanks again!!
2007 Pontiac G5 GT 2.4L Misfire, MIL Lamp on VIN: 1G2AN15B97
Back again with a report on the replies and what I found. I had 4 replies on this post. One said to swap the plugs and injectors. #4 injector, plug and coil had already been replaced, as stated in the post. Some said heat and tap on the ECM, which I had alread... Trouble codes: P0204 (injector 4 circuit problem), P0300 (cylinder misfire).
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