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Prev Professional Automotive Repair Technical Discussions for November 19, 2012
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Open Help Requests for GM
Help Request Answers
1989 Chevrolet S10 2.8L Lighting VIN: 1GCBS14R6K
The truck was dropped off, with the issue that randomly, when you turn the headlights on, the engine will die imediately, and you have to play with the headlight switch (on and off) a few times before the engine will start back up. When the engine dies, the he...
1992 Chevrolet Corvette 5.7L Poor Idle Quality VIN: 1G1YY23P4N
hey guys, Thanks in advance for any replies. I really feel dumb asking this but it is driving me crazy. Vehicle is a 1992 Corvette base model 5.7 with optic spark ignition. vehicle would run poorly most of the time. Vehicle is from a used car lot and they said...
1997 Chevrolet Tahoe LS 5.7L #2 & # 8 cyls VIN: 1GNEK13RXV
misfire goes away 2500 RPM no load roller cam rockers & springs good back off rockers air check cyls. good no crossover seepege in head gasket between cyls
2000 Chevrolet K2500 5.7L Unknown VIN: 1GCGK29R0Y
Truck starts to shake at 65 when braking shakes worse had rotors cut for lateral run of .007.Still has same run out after having them cut but I tend to rule it out because of the vibration at 65 without touching brakes.Also I pulled one of the front shocks and...
2004 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK29204
Hello everyone and thanks for reading. Im in over my head here because a buddy that talked me into working on his duramax. I have a 04 Duramax that the customer drove in for a no start issue. He can start it by using starting fluid. Rail pressure mirrored the ...
2008 Chevrolet Silverado 3500 HD WT 6.6L Excessive Emissions VIN: 1GCJK33688
hi i need some info from some duramax techs, customer is complaining of excessive black smoke when towing his travel trailer(9000lbs).no codes .my question is what are the specs for the injector balance rates.i have #1 0.1,#2 0.3 #3 0.3 #4 0.1 #5 0.6 #6 -1.1 #...
2003 GMC Yukon Denali 6.0L MIL Lamp on VIN: 1GKEK63U53
Greetings fellow techs, Got one here that has been eating our lunch for a couple days. 2003 GMC Yukon 6.0 came in with check engine light. Customer stated it lost power and wasn't able to accelerate. When we started it of course it worked OK. Codes stored were... Trouble codes: P0120, P2135 (Throttle Position Sensor 1-2 Correlation)
1991 Pontiac Grand Prix LE 3.1L fuel injector VIN: 1G2WH54T8M
car has no injector pulse has spark on all six cylds new ecm and module noid light test no good injector with key on has power on both side with injector pluged in or not
2008 Pontiac Vibe 1.8L Hesitation, Cuts out VIN: 5Y2SL65828
Reaching out the the automotive brotherhood for some help with this one. The vibe originally came in with an intermittent loss of throttle control and a code p0121 throttle pedal position sense switch a perfomance fault. The trouble tree and testing indicated ... Trouble codes: P0121 (Throttle position sense switch a performance), P2111 (Throttle Actuator Control TAC Throttle Valve-Stuck Open)

Fixes & Summaries for GM
Fix/Summary Answers
1986 Buick Skylark Custom 3.0L No Start VIN: 1G4NJ69L8G
Well this one is fix, need a ecm and ignition module. Knowing the parts where from az I didnt rule that out but want to make sure it was bad parts before changing them. The computer was also changed, it was a used one. The o2 sensor was new but not switching a...
2006 Buick Rendezvous CXL 3.5L Stall, No Crank VIN: 3G5DA03L56
Well everyone, the vehicle is fixed. Unfortunately, it took a trip to the dealer for a new PCM. Some of the replies were; 1) Clean the throttle body. This was one of the first things I checked as routine and it was OK. 2)Check for U codes in other modules. The...
2001 Cadillac Eldorado ETC 4.6L Stall VIN: 1G6ET129X1
Hi After three extended test drives it has not stalled. After reading all replies, I replaced fuel pressure regulator thinking at times it would leak to vacuum and flood engine. Released to customer and second day out it stalled again. I responed myself, but ...
2005 Cadillac STS 3.6L Drivers Door Latch VIN: 1G6DW67725
Thank you Nick from Wisconsin, the door latch hasn't been working for some time now, so Sunday I took the door panel off and with the Verus I was commanding the door actuator to open. I was getting voltage on both wires(green w/white and green w/black) at the ...
1993 Chevrolet Corsica LT 3.1L Stall VIN: 1G1LT53T5P
The ecm was faulty,after replacement the car does not stall. Waited a while to post repair to be sure it was done.
1999 Chevrolet Tahoe LS 5.7L 1-2solenoidvoltage VIN: 1GNEK13R7X
i cut the wire from computer to solenoid found computer was holding it grounded and slowly releasing.also did the test tree for cars also to help verify.replaced computer relurned passcode for key and it shifted fixed the problem whiched stemed f...
1999 Chevrolet Astro 4.3L monitor status VIN: 1GCDM19W5X
thank you for all the replies. Richard from cali. sent this link. this was just what I needed. All "sub-tests" had to do with post cat o2 . replaced rear o2 and all monitors ran within 10 mile test drive.
2001 Chevrolet Silverado 1500 4.8L Steering VIN: 2GCEK19V61
Sorry for the delay in posting the fix , After putting multiple ps pumps on this vehicle and a steering box I put a brand new GM pump on it had a cost of 212.00 dollars I will never use an aftermarket rebuilt pump again and this includes AC delco the new pump ...
2007 GMC Yukon SLT 5.3L remote start and door locks VIN: 1GKFK13077
Circuits, modules, transmitters and recievers all tested ok. We opened drivers door to start buss communication, removed DSM fuse to power down remote control door lock reciever. Reinstalled fuse after 20 minutes and has worked ok for a month now.
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