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Prev Professional Automotive Repair Technical Discussions for January 6, 2009
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Open Help Requests for GM
Help Request Answers
2000 Buick Park Avenue 3.8L convertor VIN: 1G4CW54K8Y
please help the tcc solenoid shows always on with snapon solus scanner and wont even go to off when using functional test on scanner. i think it may be grounded inside the trans. test light will light from battery pos to brown wire term 78 c2 at pcm (tcc pwm s...
2000 Buick Century Custom 3.1L Problem filling tank VIN: 2G4WS52J81
Car came in as a no start, noted that it looked to have been sitting for a long period of time. Tests found a bad/inoperative fuel pump. Upon removing gas tank, tank was full of debris and stale gas. Replaced unit, cleaned out gas tank and put 5 gallons of fre...
2002 Buick Regal LS 3.8L No Start, Cuts out VIN: 2G4WB55K72
Vehicle was in a month ago for lack of power,cat was discovered to be no good,customer was advised that dealer will replace cat at no cost(because of recall for cat),customer had no time to bring car in to dealer so he wanted us to do the job.Our local dealer ...
1990 Cadillac DeVille 4.5L Excessive Emissions VIN: 1G6CD5331L
Hello group, I have this Cadillac SDV that has a rich running condition. Fuel pressure and regulator are good, no evap issues, air injection disconnected. Map, Tps all within specs. The computer is trying to compensate by dropping block learn and integrator f...
1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y0T
96 Deville 4.6 codes P0171/P0174 air flow runs approximately 4 GPS at 650 RPMs long term fuel trim goes to 37% and locks there. Have blocked all vacuum passages, eleminated EGR, verified cam timing,tested compression,tested and substituted fuel,cleaned injecto... Trouble codes: P0171, P0174
2001 Cadillac DeVille DHS 4.6L Misfire VIN: 1G6KE54Y31
Car orginally (08-2007 - 125,000km's) came in with misfire on #8 cylinder. Tested. Front coil was faulty. Replaced spark plugs (original), plug boots and front coil. Car returned with misfire & po300 (10/2007 - 126,600km's). Tested, #2 cylinder misfire. Repla... Trouble codes: 1381 (cylinder misfire abs/pcm data loss), P0301 (misfire 1), P0302 (misfire 2)
2003 Cadillac Escalade 6.0L Stall VIN: 1GYEK63N53
Hi Group, The lights were left on overnight. We replaced the battery and now the idle is too low or the car will stall. I can not find any idle relearn procedure for this car. Any help would be great. Thanks, Mark
1973 Chevrolet K10 5.7L Factory Tach VIN: CKY143B142
Hello, guys! I'm working on this Chevy pick-up here that has a factory in-dash tach. The problem is the tach displays the engine RPM'S faster than they actually are. At an idle, the tach seems to be fairly accurate. As soon as you raise the rpm's the tach need...
1992 Chevrolet Lumina 3.1L Hesitation, Surge, Stall VIN: SIUT96UE84
This car came in with fuel pouring out of the throttle body. We rplaced the fuel pressure regulator. When we had the upper intake off we found the EGR port plugged so we cleaned the carbon out of it. We checked the spark plugs they were gas soaked and the wire...
1996 Chevrolet Tahoe 5.7L Headlights VIN: 3GNEK18R7G
Greetings, This Tahoe came in with the complaint of the headlights turning off while driving. They would only come on after turning the switch off then back on. I noticed that the daytime running lights aren't working at all and the green indicator on the ins...
2001 Chevrolet Blazer LS 4.3L Starting VIN: 1GNCS13W61
hello fellow techs i have this blazer that came in a while back with an intermittant crank no start and running bad when first started fuel pressure was only 24 psi.we replaced pump and filter ran fine for a few weeks came back with no fuel pressure installed ...
2002 Chevrolet Malibu LS 3.1L passlock VIN: 1G1NE52J22
i have this 02 malibu with repetitive lock cylinder failures. the new lock cylindes last approx a year then start setting passlock codes. my customer wants to know if there is any way to bypass this before he buys another lock cylinder. i have searched the arc...
2002 Chevrolet Camaro Z28 SS 5.7L MIL Lamp on VIN: 2G1FP22G42
This car came in for a check light and code p1416 was found. After running through the diagnostic test which watches for the o2 sensors to drop below 350mv when air pump is activated(which they did), the test passes, meaning the problem is intermittent. When t... Trouble codes: P416
2006 Chevrolet Silverado 1500 LT 5.3L 4wd high VIN: 2GCEK13T36
This truck came in with no pull in 4wd low and 2wd and terrible scrap iron noises when rolling. I replaced the transfer case with a used one. It now pulls fine and no noise. It would not however go into 4wd low. It would make a few attempts then go back to the...
2008 Chevrolet Silverado 2500 HD WT 6.6L park assist VIN: 1GCHK23618
Thanks in advance. This truck has had a flatbed installed that doesn't have the sensors for the park assist system and customer doesn't care to have them. The question I have is does anybody know how to by-pass the system so the warning lights and beeper arn't...
2001 GMC Sierra 1500 HD SLE 6.0L oil leak VIN: 1GTGK13U41
This truck has a pretty bad oil leak from the rear of engine, but there is no room to look. I have tried mirrors and bore scoope but can not find the source. It is narrowed down the either the rear main seal or the rear of the vally pan. The 6.0 uses a module ...
1986 Oldsmobile Cutlass Ciera Brougham 2.5L Stall VIN: 2G3AM19R2G
need help folks. sypmtoms still same after performing all repairs listed. except code 35 no longer present. drive vehicle 10 minutes. come back to shop. shut off engine, re start after 5 minutes and engine will constantly stall at idle and/or in gear. if allow... Trouble codes: 35 (iac code)
1998 Pontiac Grand Prix GT 3.8L ABS Module VIN: 1G2WP52K6W
Vehicle has intermittent ABS & Trac control. Abs Light off, all works as advertised. Drive some times short, some times long distance, ABS & trac light will come on. I get no communication with Snap On Modis ABS light on or off. so no codes or info. Test at Ab...
1999 Pontiac Grand Am SE 2.4L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2NE5ZT5X
vehicle will start to surge\stall under hard pull almost like running out of gas. with accelerator pedal to floor slight lift and will straighten up and run fine.does not have a definite missfire just surge and buck Trouble codes: P0200, P0300
2000 Pontiac Grand Prix GT 3.8L Upper Plenum VIN: 1G2WP52K6Y
Hello Group, I have this Grand Prix that was towed in the customer flooded it and it backfired due to a tune-up issue and exploded the upper plenum. I replaced the plenum with a Dorman part# 615-180 and also did a tune-up(plugs & wires). Filled it up with cool...
1997 Saturn SC1 1.9L No Start, no pcm comm. VIN: 1G87F128XV
Car came in for trans. problem. The car started and moved on the day of delivery. The car then sat for a couple weeks before we could get to it (very busy). When we finally went to get it the battery was dead so we replaced it. The car would not start. No spar...

Fixes & Summaries for GM
Fix/Summary Answers
1986 Chevrolet Cavalier CS 2.0L no power VIN: 1G1JD69P5G
great replies guys, this one is fixed, as many of you said the distrubutor shaft had a loose magnet (pressed onto splined area) i should of thought of this but didnt. i have seen this before a long time ago. the magnet was so loose i could turn it by hand....
1997 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M5V
Sorry it so long for the reply on this one, the customer was in no hurry and we had lots of other work to do, I wish I knew what was causing the problem with this one, I took the wire harness out of the car from the ecm to the transmission and untaped it and t... Trouble codes: P0560 (System Voltage), P1635 (5 Volt Reference Circuit A).
2000 Chevrolet Blazer LS 4.3L Surge, Misfire, MIL Lamp on VIN: 1GNDT13W2Y
Thangs To All Who replied The problem was the Dist.rotor.It had been tuned up not too long ago and the two screws holding the rotor in place one was missing and the other was loose letting the rotor move around.Why it only cause a problem at low RPM I guess I... Trouble codes: P0300.
2002 Chevrolet S10 4.3L Front Axle VIN: 1GCCT19W62
Well, this customer decided to take it home as is. I told him to use 4wd only when necessary - his home was over a high mountain pass. I asked him to call us with a fix, but he has not yet called. If he does, I will post it. Thanks again for your responses...
2004 Chevrolet Silverado 1500 5.3L Misfire VIN: 1GCEK19T64
Thanks to all that responded. Especially to Alex. The Misfire sensation was in fact a harsh TCC shudder, only hot,only in certain driving situations just as the GM TSB # 05-07-30-017B describes. The part they left out was that the water in the trans was defini...
2008 Chevrolet 2500 HD 6.6L low power VIN: 532545Y545
Sorry it took so long to close.I wanted to make sure of fix before closing,because the weather warmed up then got cold again.Truck runs good after changing filters and adding Power Service 911.Also using only ultra low sulfur fuel from brand dealers.My opinion...
2001 GMC Sierra 1500 SL 4.3L 1-2 shift VIN: 1GTEC14V91
i would like to thank the people that replied for their help.because the pressures in a manual shift application are higher than an overdrive selection are higher it has proven to us that the problem is caused by a front sprag failure.this involves a tear down...
2003 GMC Yukon SLE 4.8L MIL Lamp on VIN: 1GKEK13V33
thanks to all for your help. it was the intake gasket seeping air when cold. so far so good :0). it was close to unanimous the intake gasket was the problem. it was hard to believe an intake would seep air at only 54000. chaulk one more up for those engineers. Trouble codes: P0171, P0174.
1998 Pontiac Grand Am SE 2.4L Charging VIN: 1G2NE12T7W
The vehicle is fixed finally it turned out to be a defective alternator (reman from local parts stores we tried 3 of them and then I got one from the junkyard and it all works fine so you can never trust these reman parts,thanks for all the help.
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