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Prev Professional Automotive Repair Technical Discussions for April 20, 2009
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Open Help Requests for GM
Help Request Answers
1997 Cadillac Seville STS 4.6L battery VIN: 1G6KY5297V
This vehicle kaaps killing the battery after setting for a day or more. Sometimes it can set for four days before draining the battery. The strange thing is when I touch the test light to the negative post(using the light to show draw) to discharge any capacit...
1997 Cadillac Seville SLS 4.6L Stall VIN: 1G6KS5245V
hi everybody. please help if you can. this car will just stall at anytime.unless the map sensor is unplugged,then it will not stall. we have tried everthing,tested all grounds.tested map tps maf wiring. added fuel pressure. even though we have spark and pressu...
2003 Cadillac DeVille 4.6L Starting VIN: 1G6KD54Y73
We have this caddy here thats causing me to pull my hair out. Car came in with battery completely dead. Charged battery up and car started fine, everything worked normal, alternator was charging. I load tested the battery and it was junk so I replaced it. Sent...
1997 Chevrolet C3500 Cheyenne 7.4L No Start VIN: 1GCHC33J2V
engine after runs and then you turn it off.you go to start it dont start fast. I want to find out what is the spec on a fuel volume test on this vehicle.
1999 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GNDM19W8X
Hey guys, here we go again. I have a vehicle in that has the check engine light on. I have checked the codes and it showed PO300, random misfire. I have done a tune-up which included, cap, rotor, wires, plugs, fuel filter and air filter. I have also cleaned th... Trouble codes: P0300 (Random Misfire)
2000 Chevrolet Blazer LS 4.3L lifters VIN: 1GNDT13W8Y
Lifters rattle at all times. I need oil pressure spes.
2000 Chevrolet Silverado 1500 4.3L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1GCEC14WXY
Ok. Here goes the story. One of our customers sons got a DUI under age about a year ago. His license was suspended and the truck sat til about a month ago. On the second day of driving, customer notices a loud knocking noise from the engine, so he had it towed... Trouble codes: P0131, P0151, P0171, P0174
2001 Chevrolet Camaro 3.8L Reduced Power VIN: 2G1FP22K81
This car comes from a friend in the business(parts), he has had it to several shops that were closer to him than we are and at best the problem was resolved for short periods of time. I think it just cleared itself for those short periods, have seen it do that... Trouble codes: P1518 (Loss of serial data between PCM and TAC module/Reduced Power Mode)
2001 Chevrolet Silverado 2500 HD 6.6L Cuts out VIN: 1GCHK23181
Hi Group This Duramax PCM Is not letting me access engine data. All modes come up N\A. Trans. modes all come up avialiable The PCM has just been reflashed with oem program but still cannot access engine data are the proformance companies making chips or progra... Trouble codes: P0093 (Large Fuel Leak)
2002 Chevrolet Impala 3.8L starting, bcm/pcm comm VIN: 2G1WF52E92
vehicle came in with alternator light on and cel on. codes galore and one code for loss of comm with bcm 1164 freeze frame showed a voltage spike of 16 volts at time of failure. replaced alternator cleared codes and check system. all was good. cust came to pic...
2004 Chevrolet Express 1500 5.3L Poor Idle Quality, Surge, VIN: 1GCFH15T84
We have a problem with this van jumping about 900rpm randomly at idle. It will jump up randomly if sitting at a light. It does not happen all the time and the fuel trims are about -3 so Im ruling out vaccum leak. On the scan tool the only pid out of spec is TP... Trouble codes: P0507 (idle too high)
1997 GMC K2500 Sierra SL 5.7L 4 wheel drive VIN: 1GTGKZ9JOV
Hey guys This transfer case is acting strange if try to shift to 4 high from 2 high the module click a few times and stay in 2 wh but if you go to 4 low then to 4 high it will stay in 4 high. We have replaced the module, encoder and motor assembly. We have tes...
1998 GMC K1500 Sierra SL 5.7L Stall VIN: 1GTEK19R2W
The truck came in with dash lights out, airbag light on and dead battery. We repaired the lights, with help from you guys, we found the airbag problem and the abs controller was bad so we replaced it. I reconnected the battery and now the darned thing will sta...
1999 GMC Savana 2500 5.7L No Start, Hesitation, Cuts out, Stall VIN: 1GTFG25R7X
hi guys , need some help on this one , I'm not familiar with GM vehicles. This van has an intermittent stalling after driving for a while and won't restart. after waiting for a while the van restarts. other than that the van runs really good. things I checked ...
2000 GMC C500 7.4L abs module VIN: 1GDE614B90
hello and thank you in advance for your help, we replaced the ebcm and dtc c0279(trim level incorrect) is causing a major hold up. i was told that if we drove the truck @ 12mph & 50mph that the module would be able to see the wheel speed sensors and it would ...
1998 Oldsmobile Silhouette GLS 3.4L No Start VIN: 2P4GH45R3N
From what I understand. The cust has replaced 2 fuel pumps from AZ or Orielleys. The last pump was replaced with a dealer pump. From the info I recieved the pump will last about 2 months. Tech as checked for proper power/ground, everything is within specs. The...
2001 Oldsmobile Aurora 3.5L electrical VIN: 1G3GR62H41
I can't seem to find the calibration updates fo rthis car, I tried gmcalid.com but I couldn't find the list?? can anyone help me on this one? please
2005 Pontiac Montana SV6 3.5L ac compressor VIN: 1GMDV33L55
This customer boosted his van and since then, the A/C wont turn on and you cant control the temperature(manual system)Everything else works fine.All fuses are good. no codes stored and scanner is reading 3.0V ignition voltage. I checked ignition and and batter...
2005 Pontiac Sunfire 2.2L Chain VIN: 3G2JB12F55
This Sunfire will start rattling from the front lower end of the engine when warmed up. The noise goes away under acceleration. Removed the drive belt, noise is still present. I figured it was either balancer or timing chain. Going for the easier of the two, ...
2006 Pontiac G6 GTP 3.9L Replaced BCM VIN: 1G2ZM55166
Used car dealer replaced bcm with a used one. Now of course the odometer reads the bcm mileage. I am not a dealer but I have a tech 2 and candi module. I tried to reprogram the bcm, but it won't allow me. Is it possible to do it with a tech 2 or does it have t...
1997 Saturn SL2 1.9L crankshaft damper VIN: 1G8ZK5279V
car first came in last aug. with belt off found pulley torn loose from crankshaft dampner, replaced and car returned two weeks later with same problem installed another dampner under warranty and it has lasted since sept. and returned last week with same probl...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Skylark Gran Sport 3.3L prndl fuse/cluster VIN: 1G4NM54N3N
Well finally it is fixed. and what excellent suggestions by all! It ended up being a wire in the trunk backup light circuit rubbed through to ground at the left side of the back of the trunk. The tech that originally checked this out mislead us into thinking t...
1999 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G4HP52K6X
Thanks to all that replied. You are not going to believe this fix. I kept circling back to the ignition module, to the point of installing three different modules, two from Car Quest and one from NAPA. After having my hands all over the rest of the engine, we ... Trouble codes: P0336 (CKP performance), P0706 (Transaxcle range switch performance), P1361 (IC circuit [...] voltage), P1362 (Ignition bypass circuit [...] voltage).
1996 Chevrolet Blazer 4.3L Surge, Misfire VIN: 1GNDT13WXT
Hello all thanx for the help we have drove this truck about five times now and checked trans fluid it was low turns out the torqure converter clutch was slipping due tgo low fluid whey tghe check engine light came on for an 02 sensor we just replaced we don't ... Trouble codes: P0151, P0300.
1999 Chevrolet Tahoe 5.7L Hesitation, Surge, Cuts out VIN: 3GNEK18R1X
Good grief guys, Thank you very much for the overwhelming responses. James from Alabama seemed to have been the closest. All of you were very helpful in that you guided us thru & made sure we ck'd everything. Please read the following response. Thanks, Mr ...
1992 GMC C1500 Sierra 5.7L master cylinder VIN: 2G2AG51W6J
Re center the valve did fix it . Thanks for all those replied
1995 Oldsmobile Silhouette 3.8L TCC Code VIN: 1GHDU06LXS
PCM fixed this vehicle. Sorry for the length of time to reply but the customer had more time than money so the diagnostics were done over a course of time. Thanks to everyone who provided input. The ignition switch so many suggested was not the fix as I had...
2002 Oldsmobile Silhouette Premiere 3.4L park assist VIN: 1GHDX13E12
This didn't make much sense. It had a code for a bad reverse input signal but it had a bad sensor in the bumper. Reverse input was fine. Sensor was busted in half.
1997 Pontiac Sunfire GT 2.4L timing chain tensioner VIN: 1G2JD12T9V
Let me start by saying thank you to all that replied to this mess. I'm not really sure what fixed this vehicle bit we learned a lot and even used parts from different years. The first thing we did was replaced the chain as it was stretched maybe 1/4 inch (this...
2000 Pontiac Grand Am GT 3.4L high rpm idle VIN: 1G2NV12E9Y
I haven't repaired the car because the owner of the car now wishes to sell it "as-is". It's here for sale in front of our shop, so it may still get repaired by the new owner. Thank you all for your suggestions. I print all these helpful hints and keep them ... Trouble codes: P0135 (o2 sensor b1s1 poor performance).
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