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Prev Professional Automotive Repair Technical Discussions for October 1, 2012
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
2003 Buick Century Custom 3.1L Misfire VIN: 2G4WS52J63
Some much for easy. Car came in for rough idle. Found #3 cylinder misfire counts rising quickly. Scope tested ignition system and could see #3 pattern was different. Look lean. Scoped injectors and all patterns looked the same. Flow tested injectors and all ga... Trouble codes: P0300 (Misfire detected)
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2006 Buick Rendezvous CXL 3.5L steering VIN: 3G5DB03L06
We have this Buick Rendezvous AWD that has this strange "moan" when turning while moving slowly. It sounds as if it is coming from the front of the vehicle. We are aware of the rear differential fluid change but do not want to make that change if the noise is ...
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1994 Chevrolet S10 LS 4.3L Poor Idle Quality, Misfire, Low Power VIN: 1GCDT19W0R
Poor idle quality. Misfire when cruising about 45-55 mph and slight throttle applied (miss goes away with no throttle). Misfire with RPMs raised and vehicle stationary. No check engine light/codes. Sparkplugs were in very poor condition: some dry, some ...
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1994 Chevrolet Lumina APV 3.8L Fires, then dies
Brought in by another shop, fires up every time, dies immediately, see related repair
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1994 Chevrolet K3500 Cheyenne 6.5L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GCHK34F6R
Truck came in crank no start. No pressure to fuel filter. Lift pump was bad-installed new lift pump and filter. Tried to start and would not. Verified main injection pump was bad as well and ordered replacement. Installed brand new Stanadyne unit complete with... Trouble codes: 17 (High resolution circuit fault), 18 (Pump cam reference pulse error), 35 (Injection pulse width error/response time short), 36 (Injection pulse width error/response time long), 54 (Pcm fuel circuit error), 88 (Tdc offset error)
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1996 Chevrolet K1500 Cheyenne 5.7L power steering VIN: 2GCEK19R1T
I have a simple system that is turning out to be a headache. I have power steering that works fine when driving, but in the parking lot it goes away. If you sit still and turn the wheel back and forth a few times the power steering quits and the fluid gets aer...
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1999 Chevrolet Tahoe 5.7L cyl 3 VIN: 3GNEK18R5X
thanks in advance for all help and suggestions. i don't understand what could have gone wrong, pulled upper intake to convert injectors to mfi, completed job. upon start up, heard instant rattle/slap/ or knock. cylinder 3 now has misfire. compression test dry,...
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2005 Chevrolet Impala 3.4L Surge, Misfire, MIL Lamp on VIN: 2G1WF52E85
Came in with a P0300 misfire code and no driveability complaint. On road test under light load only we are getting misfire counters on all cylinders but mostly on #4 and #1. Can feel it when power braking lightly also.Plugs and spark output good, swapped coi... Trouble codes: P0300
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2006 Chevrolet Uplander LT 3.5L park assist VIN: 1GNDV33L26
Hello all GM techs I want to thank you in advance for any advice you can give. We have a 2006 Uplander and the ultrasonic park assist just stopped operating, according to our customer, it worked fine one day and the next morning it stopped operating. I will be...
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2007 Chevrolet Colorado LT 3.7L wont start VIN: 1GCDS13E87
Vehicle will start n run just fine for a day or two thn suddenly i open key security light will b flashing n truck wont start, i relearn the pass lock key again n it starts just fine. Theres times i have to do this 3 times a day, hope u can help n always thank...
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2007 GMC Yukon XL 1500 SLT 5.3L Fuel Filler VIN: 1GKEK16317
Can't fill fuel tank-vent already replaced per tsb.anybody seen this?
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2001 Pontiac Aztek 3.4L starter VIN: 3G7DA03EX1
Vehicle towed in for no start. Found no voltage at starter solenoid. Traced problem to ground side of starter relay (not getting its ground signal from ECM). So far I have replaced ECM, ignition switch and Park Neutral position switch. ECM ground is good. Any ...
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2006 Saturn Vue 3.5L abs VIN: 5GZCZ53466
This vehicle has a false activation at low speed, just close to stop position, we have snap on solus pro and every time we connect to abs, it disables abs by putting the light on in dash but we can still see the abs data, it however doesn't have a code. We hav...
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Fixes & Summaries for GM
Fix/Summary Answers
2006 Cadillac STS 3.6L Stall VIN: 1G6DW67796
I replaced the push button ignition mode switch on the dash. Test drove vehicle many times and gave back to customer. All seems well. Thanks for the input.
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1987 Chevrolet Astro 4.3L Cuts out VIN: 1GCDM15Z1H
Thank you for every one taking the time to read my post and reply.the van finally fixed,the problem is the ecm,After all these parts i was replaced didn't fix the problem so i removed the air cleaner housing looking at the two injector,i noticed one of the inj...
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1999 Chevrolet Silverado 1500 5.3L lights VIN: 2GCEC19T4X
Thanks for all the replies! I did feel seriously stupid about not seeing the legand on the wiring diagram about the "buss center". I found the problem to be in the connector that is on the left side of the steering column. The terminals on the multi-function ...
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1999 Chevrolet Tahoe LS 5.7L wheels VIN: 1GNEK13R5X
Thanks to all for the quick responses. I had to wait see how the repair was going to go because the customer wanted to wait a week to schedule it. I was able to make a difference by adjusting the sector shaft in the gear box. When I explained to the custome...
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2003 Chevrolet Silverado 2500 HD 6.6L Surge, Misfire VIN: 1GCHK23183
Ok guys thanks so much for all the answers this is my conclusion, i monitored the balance rate of all eight injectors and none fell outside of the factory specs so the next move i made was to indiviually shut them down with the scanner to see if i could get th... Trouble codes: P0234 (Turbo overboost), P0500 (Vss error), P1094 (fuel rail low wheel idle or fuel cut), P1621.
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2006 Chevrolet Uplander LS 3.5L C0040 Rt front wheel speed sensor fault
As suggested by one of the helpful techs... We changed the left front hub assyl even though our snap on scanner was telling us it was the right hub. It's been 3 weeks and no ABS warning light. Thanks to everyone for their advice. - Tom
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2001 Saturn L300 3.0L No Start VIN: 1G8JW54R31
Ok. It is now a week since I replaced the wiring harness going to the fuel pump. Car runs fine. No issues. Wiring harness is part # WH3001. This one really took me for a run and several of the responses pointed in the direction of a wiring contact probability....
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