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Prev Professional Automotive Repair Technical Discussions for May 7, 2009
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Open Help Requests for GM
Help Request Answers
1989 Buick Reatta 3.8L Excessive Emissions VIN: 1G4EC11C0K
I have been testing this vehicle for two days now, here is what I have found so far. Engine running extremly rich. 10% CO on emissions test, no engine light. Fuel pressure is good. Mass air flow sensor cleaned and tested within specs. O2 sensor stuck biased lo...
1996 Buick Century Custom 3.1L Stall VIN: 1G4AG55M4T
Owner complained of stall when stopping last week, test drove and couldn't duplicate so I removed throttle body cleaned plate and IAC motor. Car came back today stalling more often. Now car will stall about every 15 to thirty minutes while idling in the shop. ...
1999 Buick Park Avenue 3.8L Misfire VIN: 1G4CW52K4X
hi guys, this buick is killing me. car came in with new tune up parts and a horrendous misfire under load. it idles great. fuel trims look good. i tried shorting cylinders under a load and all 6 seem to drop. the kicker is, i've got no codes and the misfire co...
2001 Buick Century Limited 3.1L Electronic VIN: 2G4WY55J31
car came in with trans stuck in 4th gear we hooked up scanner and did not find any codes . we un hooked battery to try and kill memory to see if it would reset and nothing change. We had another computer so we changed it out to see if it fixed it and we cant c...
1988 Cadillac Brougham 5.0L dies on accel VIN: 1G6DW51Y7J
Customer recently purchaced car & is in VERY GOOD condition. Car originally came in for dies on acceleration in gear at times .As soon as you give it gas in gear it will die right out. Will restart and idle OK . Rebuilt carberator and returned to customer .Cam...
1994 Cadillac DeVille 4.9L Cuts out VIN: 1G6KD52BXR
Well we have this 94 Deville came in for a misfire and loss of power. What we found is four of the fuel injectors are turning off at 1700 Rpm. We check the injectors and four of them were bad so customer broght injectors from old engine which ran fine. We inst... Trouble codes: 099 (Cruise control Applied)
1992 Chevrolet G20 Sportvan 5.7L No Start VIN: 2GBEG25K3N
I really need some help with this one. This van starts and runs perfectly for 20 seconds at a time. After 20 seconds the fuel pump shuts off and it dies. It will restart immediately and run for 20 more seconds. Prior to the beauty falling in our hands, the own...
1997 Chevrolet Malibu LS 3.1L drive engagement VIN: 1G1NE52MXV
purchased at auction with this problem..very hard slam going int any foward gear, reverse is much better. transmission tech got code for pressure solenoid and replaced it. same problem. another shop replaced entire transmission with used and exact same problem...
1998 Chevrolet Corvette 5.7L cluster VIN: 1G1YY22G8W
gauges erractic, message center displays inacurate messages, gauges inop at times, starts when it wants to, all accessories inop at same time or only a few at a time.
2000 Chevrolet Tracker 1.6L seals VIN: 2CNBJ1864X
thank you all. this tracker came in with what i thought was a rear main seal leak. replaced seal leak still the same. removed trans, used smoke machine on oil system, crank sensor leaking replaced o-ring and retested o.k. reassembled and still leaking but 1 dr...
2002 Chevrolet Express 2500 5.0L Starting VIN: 1GCFG25M92
Hey Folks, I got one that is just making my week. This Chevy Express 2500 was brought to my shop last week, the problem is the frist cold start. I have good spark, Fuel pressure, and no codes. As long as the motor is cold, it will crank fine and all the other ...
2003 Chevrolet Impala LS 3.8L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 2G1WH52K23
Hello fellow techs, This car was on a road trip when the customer noticed a lack of power and a check engine light.At one point the car would barely go 50 mph.The check engine light started to flash and they shut the car off. It would not restart and was towed...
2005 Chevrolet Cobalt 2.2L tail lamps/cluster back light VIN: 1G1AK52F45
Hey guys just wonder if these cobalt have any common wiring problems that cause a short that blows the 15 amp tail light fuse under the hood.This problem is intermitten and seems to happen when nothing is changing ,moving, or driving.I've have been looking at ...
1998 GMC Savana 2500 5.0L No Start VIN: 1GTFG25M6W
vehicle came in as "no start" . with key in on position fuel pump cycling on and off . data display comes and goes . found pcm rotted / full of water . my question is . if i install a salvage yard computer in this thing , what issues besides crank relearn may ...
2003 GMC Sierra 2500 HD 6.0L Starting VIN: IGTHK29U73
Hello Gruop, When you first turn the key on in this truck the shift indicator light showing park is on as normal and the truck will start. Now the trouble...if you don't turn the key to crank in the first 3 to 4 seconds the little light under the "P" for park ...
2006 Hummer H3 3.5L MIL Lamp on VIN: 5GTDN13696
I thing this one is for the books, I have a recurrent MIL lamp ON (P0171). I think I have a concept missed or I lack of complete understanding about how emission control works in this veh. Let me give you all the data: All info at close loop - Upstream HO2S is... Trouble codes: P0171 (System too lean Bank1)
2001 Saturn SL1 1.9L No Start, theft VIN: 1G8ZG52801
Hi everyone. I used to work at saturn, but never ran into this.Tech next to me is working on this. Car keeps setting a B2960. He has replaced the bcm, passlock sensor, ignition cylinder to insure a good magnet. It has been rewired from the passlock to the bcm.... Trouble codes: B2960

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP52KXW
Thanks to all who responded. I cleaned the MAF and intake, no change. Replaced the MAF still no change. One conclusion I need to learn more about these MAF sensors. I tried many of the suggestions mentioned and nothing showed any change or promising results. L...
2004 Cadillac DeVille DHS 4.6L all power windows VIN: 1G6KE57Y34
Been trying this one as often as I can every day since I first posted.Unfortunatly, the windows and all related systems are working perfectly!I found the ground eyelet Joseph mentioned,it was clean and intacked,with [.025 voltage drop w/windows operating.I p...
2005 Cadillac CTS 3.6L Poor Idle Quality, MIL Lamp on VIN: 1G6DP56765
Thanx for the comments and experiance. All your replies and suggestions are awarded. I did read up on all TSB's yet did not find anything relating to a crankshaft reluctor wheel. After reviewing prior engine repairs, info sent on to a local Caddy dealer and so... Trouble codes: P0008 (engine position systen performance bank 1), P0009 (engine position systen performance bank 2), P0016 (cam/crank correlation intake cam), P0017 (cam/crank correlation exhaust cam), P0018 (cam/crank correlation intake cam), P0019 (cam/crank correlation exhaust cam).
1991 Chevrolet Corvette 5.7L flywheel VIN: 1G1YY2387M
2002 Chevrolet Silverado 2500 HD 6.6L trans shift VIN: 1GCHK24102
The replies on this wre varied. Ranging from faulty ign., faulty PRNDL switch, bad solenoid E, faulty internal wiring, or short in pressure switch. After reading the replies I spoke to the customer about the results. Since I didn't feel that I had enough infor...
2004 Chevrolet Silverado 1500 5.3L Unknown VIN: 2GCEK19T64
I cleaned all of the grounds and unplugged the transfer case module connector as one of the guys said, put everything back together and it has been working fine for a week now...thanks for the help.
2004 Chevrolet Express 3500 LS 6.0L abs VIN: 1GAHG39U74
Thanks to all who replied. The vehicle has been gone several days and took a trip to dallas so i think this one is fixed. I went through all the wiring on this long van and found nothing, all seemed good so as i was looking at any other possabilities and i fou...
2006 Chevrolet Uplander LS 3.5L converter / transmission VIN: 1GNDV23L36
Well - to summarize, everyone basically agreed that this van needs a transmission. When I pulled the pan there wasn't any bad stuff in the pan or on the magnet but that fluid was very dark. Looking closer at the van it is clear that it has had a very bad acc...
2006 Chevrolet HHR LT 2.4L Engine starts, then dies VIN: 3GNDA23D66
I received 4 replies, and all were excellant. But, as I discovered the customer still had his 3 year 36 thousand mile warranty in effect, and as another mechanic had already charged him 1300 dollars for "repairs" that would have been covered under that warran...
2008 Chevrolet Corvette 6.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1G1YY26W78
Hello steal did not fix the car I go over the wiring all fine waiting for costumer to return the car and try to find anther problems post fix after that Thanks for your help Mike Trouble codes: P0443, P0102.
2001 Oldsmobile Aurora 4.0L random missfire VIN: 1G3GS64C61
This car got taken from me and given to another tech after i mentioned scoping the ckp sensors, this one has 2. The other tech ohmed the ckp sensors and they were the same so he ruled them out. The car was with us for almost a month befoe our service manager ...
1993 Pontiac Grand Am SE 2.3L Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G2NE5432P
Hello everyone and thanks to all that replied, went through all connections again including grounds. After numerous tries knowing it could not be the ECM, I replaced the ECM with another unit and vehicle was fixed. Don't know why for sure, replaced ECM twice a... Trouble codes: 65 (Injector circuit fault), 26 (Quad driver fault), 43 (knock sensor), 35 (Idle air control fault), 55 (testing and results).
1994 Pontiac Grand Prix SE 3.1L system VIN: 1G2WJ52M9R
The grand prix is fixed. Thank you to all who replied.It was a 134 system.The clue that I ignored was the gauges. It is basic ac mechanics that when high and low sides are the same or nearly the same the compressor is faulty. In this case we had replaced the c...
2005 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ23D73
Thanks to all who replied. Timothy from Michigan had the answer I was looking for. I do Saturns so infrequently that I forgot to use the Red OBD 11 connector for programming. I could get data and do everything else with the regular connector, I just could not...
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