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Prev Professional Automotive Repair Technical Discussions for December 8, 2005
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Open Help Requests for GM
Help Request Answers
1986 Buick Electra Park Avenue 3.8L high idle VIN: 1G4CW69B9G
Hello, we have this '86 Buick (it's a Park Av-not a Lesabre like it says) that idles around 1800 rpms, and won't idle down. We can comand it to go to base idle no problem, the fuel trim is correct, no vaccuum leaks detected anywere. We tried a new Delco ECM. I...
2001 Buick Regal LS 3.8L key tumbler VIN: 3G1WS54CGH
once in a while you shut the car off and cannot remove the key from the ignition.i have checked for tsbs and found nothing. in the past i have had a grand am do the same thing and it turned out to be the shifter interlock assembly and the fix was to replace t...
1989 Cadillac Allante 4.5L no start VIN: 1G6VR3187K
My probelm is that while cranking a starting disabled due to anti theft is displayed and theres no injector pulse,a 3 minute wait to start appears on dash. Any help would be welcomed,thanks in advance
1991 Cadillac Seville 4.9L No Power VIN: 1G6KS53B7M
This vehicle came in with an intermittent no start. Determined problem to be in the lock cylinder one of the theft deterrent wires were broken. Disconnected battery to disable airbag replaced cylinder. Now when vehicle is driven it has no power. Timing chain h...
1992 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy VIN: 1G6CD53B4N
this car bucks and jerks and runs very bad after about 80 miles and owner has to pump the pedal to keep it running to get home. we had this thing in here 6 weeks ago and it had stalled so we rebuilt the dist. and it drove fine. now we have it back and it runs ...
2000 Cadillac DeVille DHS 4.6L MIL Lamp on VIN: 1G6KE57Y7Y
1994 Chevrolet K2500 6.5L Intermittent Limp in VIN: 1GBGK24F4R
This pickup will be cruising along at 50-60mph and suddenly jerk into limp in mode (2nd and Reverse gears only). The customer says the only way he can get it back to normal is to shut the truck off and restart it. I have not been able to duplicate this conditi...
1994 Chevrolet C1500 Suburban Silverado 5.7L no gears VIN: 1GNEC16K2R
Could use some advice here. I have rebuilt a few 700r4 and understand that this one is basically the same. However...not sure what to expect with this no gear issue. I want to rebuild it, but would like to know if there is a common problem that would effect al...
1994 Chevrolet S10 LS 4.3L transfer case VIN: 1GCDT19WXR
Hi techs, This vehicle will not go into 4 wheel drive high. I will shift into 4 wheel low with no problem. I replaced the dash switch and also the transfer case control module. When I hit the 4 wheel hi switch the transfwer control module clicks and the light ...
1996 Chevrolet S10 4.3L Cuts out, MIL Lamp on VIN: 1GCCS19W41
Vehicle arrived with customer complaint of ABS activates when driving down the road. After road test to duplicate found engine momentarily shuts down,scan tool resets(no codes stored),ABS resets,and fuel pump relay clicks when condition occours. Happens at all...
1996 Chevrolet Beretta Z26 3.1L Poor Idle Quality, Misfire VIN: 1G1LW15M5T
This thing gets into kind of a galoping idle like it had a vacuum leak and I sprayed propane and carb cleaner all over the engine and none found. Crimped off or plugged vac lines one at a time and still nothing. found the O2 sensor was reading negative volages...
1996 Chevrolet Blazer 4.3L Cuts out, Stall VIN: 1GNDT13WXT
Hi all & thanks for taking the time to read this. Customer had some work done at body shop and was diagnosed for a stalling problem intermentently by an affiliated shop. Customer brought me the igniton switch and I installed it. Customer picked up vehicle and ... Trouble codes: P0147, P1122, P1406
1998 Chevrolet S10 4.3L Hesitation, Misfire, Poor Fuel Economy VIN: 1GCCS14XXW
Customer brought this 2wd s10 to our shop for a misfire code (po300).Tech replaced injectors due to other new parts from previous repair shops(new cap-rotor-wires-fuel pump-plugs-cat)Injectors did not fix truck and now its in my lap. The truck when cold exhibi... Trouble codes: P0300 (engine misfire)
1999 Chevrolet Silverado 1500 5.3L No Start, VIN: 2GCEK19T8X
this vehicle starts hard after sitting, has 60 lbs fuel pressure, spark and injector pulse but cranks for a long time before starting. If you give it a shot of fuel it seems to help, after it starts it runs rough for a minute, once its running engine has great... Trouble codes: P0507 (idle speed high), P0300 (cdr misfire detected)
2000 Chevrolet Impala 3.4L Cuts out, Stall VIN: 2G1WF55E3Y
i'm going nucking futs trying to figure this one out. the car came in for a rough running complaint. i test drove it and it spudderd then stalled it was hard to restart. i drove it back it would hardly run. i unplugged the mass air flow no change. i unpluged t...
2000 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: UNKNOWN
keeps setting code 0449 vent solenoid circuit, tank holds pressure and vacuum so no leaks. tested ground to solenoid with genysis running vent solenoid test ohm reading never changed with it on or off?? Is problem with the vent solenoid(cheap)(and on order) or... Trouble codes: 0449 (vent solenoid circuit)
2001 Chevrolet Silverado 1500 4.3L Hesitation, Surge, Misfire, MIL Lamp on VIN: 2GCEC19W91
Thanks for checking this one out. Help! This truck originally came in with a complaint of a misfire. We performed a maint. tune-up and replaced ignition wires and it seemed to take care of problem. Not long after, truck came back in with the complaint of misfi...
2002 Chevrolet Trailblazer LS 4.2L fan clutch VIN: 1GNDT13S72
Original complaint was engine noise and lack of power. Dtc 0495 high fan speed was present. Diag. charts are a bit unclear and I want to know if unplugging the fan connector at the shroud, running the engine at 2000 rpms for two minutes, turning off the engine...
2003 Chevrolet Express 1500 4.3L Distributor VIN: 1GCFG15X93
Van came in for a died and no start 14,000 miles ago. We found that the distributor wasnt turning and the drive gear was severly worn, we replaced distributor with new AC Delco. Van is back with same problem again? Is this a pattern problem or could the camsha...
2002 Oldsmobile Bravada 4.2L MIL Lamp on VIN: 1GHDT13S12
we need to reprogram pcm. we are working on an 02 trailblazer and a 02 bravada that we need to reflash/reprogram/update pcm's for problems. the issue is these vehicles are owned by a local company. this company purchased these vehicles for one dollar. they are... Trouble codes: P0495 (fan clutch locked)
1989 Pontiac Grand Prix SE 2.8L valvetrain VIN: 1G2WP14WXK
I am a first time user,and need help in how to diagnose from this point,The engine co. has authorized me to diagnose this problem and call them.I have ran compression and i get 150 lbs across the board, i have done a leak down test and found aprox.38%,leakdown...
1990 Pontiac Bonneville SE 3.8L MIL Lamp on, long crank times VIN: 12HX54C9L1
The SES has been on twice for a total of about ten seconds while on the freeway once while accelerating and once while cruising. I was able to catch the code with a snapshot. When the light came on quad driver #4 went from high to low, purge went from 90% to ... Trouble codes: 26 (Quad driver failure)
1993 Pontiac Trans Sport 3.8L MIL Lamp on, A/C malfunction VIN: 1GMDU06L4P
The code numbers are correct, I'm pretty sure the titles are also. Vehicle is at work, I am home at 12:30 A.M., so please have mercy!! It came in for check engine light. 25 was the only one in "history codes". It was also in current codes along with the others... Trouble codes: 25 (MAT too high), 65 (cruise control servo position sensor), 66 (A/C pressure), 69 (high pressure switch circuit), 88 (PCM reset), 99 (power management problem)
1996 Pontiac Grand Am SE 2.4L Hesitation, Cuts out VIN: 1G2NE12T5T
hello all i have this Grand am that is killing us came in for hard 1-2 upshift and loss of power on acell. had a rich running code that kinda came and went did a tranny service oan no change, watching scan data on the tranny the trans temp is at -40 and it sho...
2002 Pontiac Grand Am SE 3.4L passlock VIN: 1G2NF12E72
this vehicle was towed in october with a no start condition. engine would not crank. when we went to check it, the engine fired right up. we checked the battery, charging system, and starter draw. everything was good. yesterday the customer called and said it ...
2000 Saturn LS2 3.0L No Start VIN: 1G8JW52R7Y
when condition is present we have no power to the fuel pump, we have pwr at the main relay and pwr at the control fuse's #1, #2, #3 , we swapped the fuel pump relay when no start condition was present and car still did not produce fuel pressure, we confirmed p...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Regal Custom 3.8L Misfire, MIL Lamp on VIN: 2G4WB52K6T
Hello fellow techs- I found a broken #5 exhaust valve springs. I really appreciated all the help everyone gave. Thank you. Trouble codes: P0300.
2001 Buick Regal LS 3.8L Misfire, MIL Lamp on VIN: 2G4WB55KX1
thank you for all your help,a plugged cat was the fix.all are happy now.love this site. Trouble codes: P0300.
2002 Buick Rendezvous CX 3.4L rear defroster VIN: 3G5DB03E12
Sorry for forgetting to close, got slammed with work with our ciold weather, forgot this was still open. Thanks for the responses, the customer picked up the vehicle for thanksgiving weekend and when they brought it back the said it appeared to be working. We ...
1992 Chevrolet Corvette 5.7L Hesitation VIN: 1G1YY33P2N
thamks to all the replies, all were helpfull. thanks to paul for the hard ground locations, several explained sweep testing on car and off. however this car has a tps module, hidden under the coolant tank, passanger side. the tps wires route to this module(thi...
1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L fans VIN: 2G1FP22P9P
sorry for the delay in responding to your suggestions. ralph from main had it right. it was a guage issue. i wasn't familiar with this vehicle. you know, how it was supposed to operate. the customer didn't offer me reliable information either, go figure. any w...
2002 Chevrolet Impala LS 3.8L Extended cranking VIN: 2G1WH55K72
Hello Group, Firstly I want to apologize for not posting this sooner. I haven't had a chance to get the car back in. Been very busy. But I'm confident an ignition switch will probably fix it. (Vehicle Theft Det. issues possibly). As the majority that replied s...
1998 GMC Jimmy SL 4.3L Fit & Finish VIN: 1G2FR365XS
wow what a strange fix.the hood hinge causing a clunk,a copper washer in between the hood and hing bolt tightened it up enough to eliminate the clunk.thanks to all who replied.
2001 Oldsmobile Alero GL 3.4L service spension light VIN: 1G3NL52E11
thanks very much the fix was simply the plug under the rear seat was unpluged. reconected it cleared the code and ever thing is fine thanks to charles [...]
1999 Pontiac Grand Am SE 3.4L headlights VIN: 1G2NE52E9X
i now know why get burned out in this proffession, gm wiring is way too light to last at all. we found a bad orange wire at the rh headlight we repaired that thinking that would repair the problem. it didn't so we went to find other ground problems and after a...
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