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Prev Professional Automotive Repair Technical Discussions for November 13, 2013
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Open Help Requests for GM
Help Request Answers
2000 Buick LeSabre Limited 3.8L Electronic VIN: 1G4HR54K6Y
This one came to me from another shop. My customer said his heat would not work and was told at the previous shop that he needed a mode door actuator but they could not get the part (strange they are common enough). Sure enough no motor movement when i went fr...
1979 Cadillac DeVille 7.0L heater VIN: 6D47S99120
morning All This cadillac has no heater control except for defrost. We just had the heads off and the customer says the heater hasn't worked since. I remember that they had a switch that would turn the heat on after the engine hit a certain temp, but I can no...
2008 Cadillac DTS 4.6L Headlamps VIN: 1G6KD57Y38
Was just curious if anyone had relevant experience with replacing the factory Cadillac HID headlamp assembly with an aftermarket unit with standard halogen bulbs. I am told both sides are a direct plug in replacement. Obviously they are a cheaper alternative f...
2008 Cadillac CTS 3.6L Misfire, MIL Lamp on VIN: 1G6DT57V98
This is a problem vehicle thats been to 4 other shops.Codes for misfire were not on when vehicle came in they came on this morning while I was testing. With your help we can get to the bottom of this. Code P0101 for maf signal comes up. The MAF sensor has been... Trouble codes: P0101, P0304, P0300 (misfire)
1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19T8X
I have a 1999 Silverado at my workshop. It's been to just about every other workshop in town. The problem is the engine management light is on (has been for years the owner told me) The problem with the vehicle was that it would stop and not re start from time...
2002 Chevrolet Impala 3.4L engine swap VIN: 2G1WF52E92
We are stuck doing an engine swap.The replacement engine is from a 2004 grand am and the cam sensors are different.I am wanting to know can this be used without changing cams??? The trigger is different as is the sensor.Any help is appreciated.
2006 Chevrolet Express 3500 LS 6.0L MIL Lamp on VIN: 1GBJG31U86
Hi guys, hope I can get some help here. This Van is actually a small school bus. Intermitently this bus sets a P0300, and the mil flashes. The driver states that no other symptoms are noticed. I have been unable to duplicate the problem while driving, but I no... Trouble codes: P0300 (Random missfire)
2006 Chevrolet Colorado LT 2.8L Misfire, MIL Lamp on
Ok I do not like asking for help but now I have no choice I have I 2006 Chevy Colorado 4 cylinder engine 2.8l this is my problem misfire on cylinder 4 it happens intermittent when is misfiring and if I pull to the side of the road and I give it gas the misfire... Trouble codes: P0300
2010 Chevrolet Silverado 1500 LTZ 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GCRKTE37A
This vehicle came in with SES on and P0300 stored, check miss history, found #4 cylinder is the problem, pulled spark plug and found porcelain on tip of plug is cracked off, found GM TSB 12-06-01-001B for oil fouling of #1 and #7 spark plugs due to bad pcv baf... Trouble codes: P0300 (Random missfire)
2006 GMC Sierra 2500 HD SLT 6.6L Power Steering VIN: 1GTHK23D76
The truck came in for a simple steering gear leaking and a bad tie rod end. After we changed both and aligned the truck we flushed the power steering and purged the air from the system. After we drove the truck a short while the power steering steering start...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Chevrolet K2500 Cheyenne 6.5L Poor Idle Quality VIN: 1GCGK24F3V
Thank you all for your input on this vehicle.It has been a few weeks now with a new injector driver and no problems.The driver had already been mounted to a bracket on top of the intake and the engine cover removed to reduce heat.I may still move it to the fe...
2006 Chevrolet Avalanche 1500 Z66 5.3L brakes lock up VIN: 3GNEC12Z86
I want to thank everyone for your ideas, but I want to especially thank Keith from Arizona I did what he said and it worked. I had already checked a lot the components all you mention. the fixed the install the bracket in between master cylinder and hydroboos...
2007 Chevrolet Corvette 6.0L High Idle VIN: 1G1YY25U97
Sorry for the delay. After leaving our shop, the customer was in a car accident. The car was in the body shop for quite a while. The car ended up relearning idle by itself, it just took several days of driving. Trouble codes: P0121 (Throttle position sensor).
1999 GMC C3500 Sierra SL 7.4L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GDKC34J3X
We acquired a scan tool that had an injector balance test and that showed excessive bleed down on the injectors so we replaced the injectors with very little change. Another one of our technicians then noticed the engine harness was contacting the egr pipe and... Trouble codes: P0172 (Fuel Trim System Rich Bank 1), P0175 (Fuel Trim System Rich Bank 2).
2006 GMC Envoy SLT 4.2L limp mode VIN: 1GKDT13S16
Sorry for the delayed response, vehicle is back on the road and still driving great. After getting the third pcm from a different dealer, flashed pcm, truck started and ran great. My guy I use for reprogramming told me his partner had an issue with a batch ... Trouble codes: P0102, P2101, P1682.
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