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Prev Professional Automotive Repair Technical Discussions for July 26, 2010
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Open Help Requests for GM
Help Request Answers
1999 Buick Regal LS 3.8L Cuts out, Stall, Idle Fluctuation VIN: 2G4WB52K0X
This car intermittently dies when you release the accelerator, "like a bad i.a.c.". We noticed the I.A.T. and Coolant Temp sensors will sometimes read -40 below on snap-on scanner but with no running problems, then it will just fix itself. Also 1 time it just ...
1988 Chevrolet K1500 Silverado 5.7L Stall VIN: 2GCEK19KXJ
Hello again dear fellas, I'm in a deep whole right here, I got this truck with a cutting off at idle complain, as you can read my repair history, almost every thing has been replaced, inspected or adjusted, truck don't have any codes, it starts and runs fine w...
1990 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Surge, Stall, Hard Start VIN: 2GCEC14K2L
This one has us at a loss, when cold you have to hold your foot on the gas to keep it running otherwise it will die, after a couple minutes vehicle will kinda idle on it's own. idle surges bad when cold also. off idle vehicle seems to run great. this appears t...
1996 Chevrolet Blazer 4.3L Hesitation, Cuts out VIN: 1GKDT13W7T
OK folks, got another kicking my tail. Truck came in with complaint of hesitation when taking off. Test drove and found truck runs good when cruising, but when you come off the gas and get back into it, it will hesitate and stumble for a moment. It will quickl...
1997 Chevrolet Tahoe 5.7L compressor VIN: 3GNEK18R7V
customer brings in and says ac works for a few minutes then starts blowing warm. he then tells me he has to disconnect the batt so it will start the next morning. checked out and found comp. stays energized even with key off, i was thinking maybe pcm but not s...
1999 Chevrolet Corvette 5.7L Stall VIN: 1G1YY32G3X
hi all, got this vette towed in last week with service column lock displayed, checked TSBs found 01-02-35-008 tsb had been done already with relay and harness installed. all the wires at ignition switck are cut and alarm installed with about 20 butt conectors ...
2000 Chevrolet Corvette 5.7L ABS pump VIN: 1G1YY32G2Y
hey guys this vette has a C1243 stored for "BPMV pump motor stall". lamp was not on on arrival, but code was stored in history. it is currently working and not getting hot. after 20 seconds or so of operation it only got to 100*F. looks like a simple circuit...
1997 GMC Savana 3500 6.5L No Start VIN: 1GDJG31F7V
The vehicle runs fine all day but when they return to the shop at the end of the day and back it into a bay to unload it, it will crank but no start after about 15 to 30 minutes. If you try to start it in the first 15 mins it will start or if you let it cool o...
2002 GMC Sierra 2500 HD 6.6L Stall VIN: 1GTHK231X2
This truck belongs to my doctor. He claims it will stall while driving if it is raining at cruise or stoping put car in neutral and will restart while rolling. I am thinking of water on a connector or the edge juice chip. I am not a diesel tech so I am open fo...
2001 Pontiac Grand Am SE1 2.4L No Start VIN: 1G2NE52TX1
Hi All just a quick question. On this grand am I am changing ignition switch (electrial part) after installing new electrial part of switch. Still using old lock cylinder and key do I still have to do re learn procedure. From everything I can find on iatn web...
1997 Saturn SL 1.9L gear ratio errors VIN: 1G8ZH5284V
Customer came to me wanting me to install a used transmission that he had already picked up...reassured me that it was the same year and was identical to the one that was in his car...installed it for him and runs through the gears good for the first shift but...
2003 Saturn Vue 2.2L won't hardly move VIN: 5GZCZ33D13
Also has EBCM codes COO50, CO161, U2105 Lost Comm W/ECM. Also has BCM Codes U2106 Lost Comm w/TCM, and U2108 lost comm w/ABS/TCS system. All these codes and those listed below will come right back, after clearing. No visible component or wiring damage under ho... Trouble codes: P0502, P0701, U2106 (Lost Comm W/Trans), U2107 (Lost Comm W/BCM), U2105 (Lost Comm W/ECM TCM Code), U2107 (Lost Comm W/BCM)

Fixes & Summaries for GM
Fix/Summary Answers
1983 Buick Regal 3.8L Stall
well, thanks again to all the amazing info. it turned out to be a bad control to the egr--keeping the vacuum signal on at idle. The customer didnt want to keep digging so we plugged the line and sent him on home. 3 weeks and he says its still running like a to...
2000 Buick LeSabre Custom 3.8L Communication line, radio, VIN: 1G4HP54KXY
Well I am sorta embarassed to post this fix. But nevertheless, I was able to duplicate the problem with a charger directly hooker up to the alt. battery post and grounding the charger to the alt. case. What I started off doing was checking the battery negative...
2000 Buick Regal LS 3.8L A/C control VIN: 2G4WB55K1Y
Finally!! Well, I can call this one fixed !! sorry it took so long for the reply but I wanted to give the customer enough time just to make sure everything is ok. As many of you suggested, the problem was in the ignition switch harness, what threw me off for a...
1986 Cadillac DeVille Touring 4.1L Cuts out VIN: 1GBDC6980U
Ok here it goes. I had already done the grounds and that did not fix it. Once it got hot it would act up. Finally hung a scope on it and saw all kinds of pulsations in the ingnition part of the patterns. Killing the alternator stopped it. Pulled the cap and ro...
1996 Cadillac DeVille 4.6L third gear VIN: 1G6KD52Y9T
Thanks for your help the solenoids were broken. replaced the solenoids and the road test confirmed the repair was complete.
2004 Cadillac SRX 3.6L no cranck VIN: 1GYDE63754
first thanks for Rob, Paul and Josh, it sorry takes long time, I got 3 helpfull replys recomend to 30m relearn , low votage at ECM and communication problem, there is a TSB for same concern recomend tp up date PCM for latest calibration I do reflash with ...
1995 Chevrolet Impala SS 5.7L Excessive Emissions VIN: 1G1BL52P4S
ok this was a weird one and almost unbelievable but true.i previously unplugged the electric air pump which only injects air upstream and when cold.the oxygen sensors and fuel trim did not indicate super high oxygen.just incase i did remove both hoses and plug...
1999 Chevrolet K1500 Suburban 5.7L No Start VIN: 3GNFK16R1X
Hey guys thanks a million for all the great input. I got some great replies and that makes for a great team. The truck finally acted up long enough to verify no fuel pressure. Traced to no power at pump. As stated before previous shop replaced pump twice. That...
2000 Chevrolet Tahoe LT 5.3L Misfire, MIL Lamp on VIN: 1GNEK13T3Y
This one turned out to be alot simpler than we thought. Sometimes a guy looks too hard at a problem and forgets the basics. What we ended up doing is hooking up a fuel pressure gauge so that we could monitor the fuel pressure while driving the truck. Bingo-whe... Trouble codes: P0300.
2000 Chevrolet Tracker 2.0L No Start, Stall VIN: 2CNBJ13C51
after checking everything again i stumbled on the problem when u push up on the cam sensor while its running it would stumble and stall the coustomer declined the work so if there are any more problems i woulnt know but im sure a cam sensor would take care of ...
2002 Chevrolet Venture 3.4L No Start VIN: 1GNDX03E42
Well, after several days of waiting on theft deterrent module, replaced it and It still would not start. I went from p1626 to p1626 and u1000.Continued to get a programming error every time I attempted to flash the VTD, error 4399 programming not completed. Co... Trouble codes: U1000 (Class 2 communication problem history), U1040 (Ebtcm communications history), P1626 (Anti theft fuel enable circuit history), U1016 (Loss pcm communications only on air bag history).
2006 Chevrolet Impala LTZ 3.9L No Start, MIL Lamp on VIN: 2G1WU58106
Fixed:Thanks to James, it took 35 minute for relearn to complete.Car runs great.We are going to keep the vehicle for a few days and drive.Thanks for all the help for everyones input. Trouble codes: P1629.
2006 Chevrolet Cobalt LS 2.2L A/c System VIN: 1G1AK55F56
Replaced compressor, and while flushing the system out found a screen filter in the outlet side of the evaporator. It looks alot like an orifice tube, but it is just a screen. It was full of debris. Replaced and all is well. Thanks to everyone.
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