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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 6, 2006
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Open Help Requests for GM
Help Request Answers
1996 Buick Skylark Custom 3.1L IP/anti-theft VIN: 1G4NJ52M8T
The customer has 2 intermittent problems that are possibly related. The vehicle will start and immediately die but will eventually stay running and then runs fine. While driving the vehicle all instrument panel lights will intermittently flash as well as gauge...
1998 Buick Regal 25th Anniversary Edition 3.8L Body VIN: 2G4WF5211W
Hello all, This vehicle has a vibration that is generated by the powertrain that is noticed throughout the vehicle & is more prominent when the vehicle is put in gear at idle. You can feel this noise under the hood an all types of things, but most on the passe...
1997 Cadillac Seville STS 4.6L tcs activation VIN: 1G6KY5292V
cad techs need some help with the traction control system on this 97 seville sts, frequently but intermittently,the the traction control system activates for no reason - when taking off from a stop the system will activate & the low traction light will come on...
1990 Chevrolet K1500 Cheyenne 5.7L speedometer VIN: 1GCDK14KOL
the speedo will work with the brake pedal depressed. have tried adjusting brake switch but the lights stay on when i adjust to get speedo to work. i am lost as to what to do next. any help would be appreciated.
1991 Chevrolet C1500 Cheyenne 5.7L probable driveline VIN: 2GBEC19K1M
after a belltech drop kit was installed the vehicle developed a rythmic howl starting before 70 mph and can be driven through at 85 mph the kit came with the drivesystem shims for angle set-up, anybody out there seen this
1995 Chevrolet Lumina 3.1L rocker arms/studs VIN: 1234567M-S
Hello everyone, This car came in with a miss, we found the #3 cylinder With a broken rocker arm stud and we didn't really think that much of it, you do see it from time to time on cars and trucks. It also had water in the oil from a blown intake gasket. The c...
1998 Chevrolet Express 1500 5.0L No Start VIN: 1GCFG15M5W
Vehicle originally towed in as no start. Found vcm split, replaced,flashed, relearned. Vehicle left running & no Mil. Determined OE vcm at fault through wiggle testing harness & tap testing vcm. Crank/no start- cold engine. Can anyone point to the vcm pin numb...
1998 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1GNDT13W5W
This happens to be my son's vehicle (of course). This vehicle backfires just about everytime it starts (that's when the symptons first occured). It is running excessively rich. Injector on time varies between 3.8 to 4.1 ms. MAP is at 1.68 at idle. Fuel trim wa... Trouble codes: P0300 (Random misfire), P0108 (MAP circuit voltage high)
1998 Chevrolet Astro 4.3L radio and door lock VIN: 1GNEL19W7W
Greetings fellow techs.This van is equipped with the speed compensating stereo system.When the radio power button is pushed the radio lights up and does everything it should except there is no volume.The volume only starts to work when you press the door lock ...
1998 Chevrolet Venture 3.4L head lights
We were coming home late at night a few days ago and noticed that I lost one of my headlamps as we drove down the road then a few seconds later I lost the other headlamp, The following day I was going to change the bulbs and thats when I noticed that the bulb...
2000 Chevrolet P-30 5.7L Alternator VIN: 5B4KP32R5Y
Truck came in with battery discharging. Customer requested new batery and alternator due to time restraints. Problem remained. Checked fuses. Found Engine fuse blown. (not ECM1 fuse.. engine still ran) Engine fuse has direct short to ground. Very limited info ...
1989 GMC P3500 Value Van 7.4L E.G.R. Problems VIN: 1GTKP32W8K
Hi Everyone: Thanks in advance. This will take some reading, didn't want to leave anything out. This is for the smog techs that may have run into this before. As I said above this is a factory duel exhaust system, no catalytic converters, vehicle is rated for ...
1997 Oldsmobile Cutlass GLS 3.1L suspension VIN: 1G3NG52M4V
help, this car came in for a rattle/clunking noise, road tested to confirm, sounds like a sway bar or strut bearing noise, pulled struts, not leaking, strut bearings ok, slight play in rack unit, replaced it, noise still there, put on new struts, took off new ...
2001 Oldsmobile Aurora 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3GR64H11
Hello, have a vehicle here that starts up and runs rough for about 5-10 seconds after start-up only when cold. you can watch misfire count on scan tool and all cylinders will miss some more than others. vehicle does have a new fuel pump assembly on it cause th...
1995 Pontiac Bonneville SE 3.8L charging system VIN: 1G2HX52K2S
I am posting this for the shop as I'm the secondary tech on this job. The alternator was replace about a month ago for a no charge condition. It is now back for an intermitant no charge and check engine light for low voltage condition. We replaced the computer...
1997 Pontiac Grand Am GT 2.4L No Start, Stall, MIL Lamp on VIN: 1G2NW52T3V
hey GM techs, I have this 97 Grand Am GT. Customer called this morning, no start. Went to his house, tried starting and it started right up. After about a minute, car died. couldn't keep running. Towed back to shop. Car then ran long enough to get into shop ba... Trouble codes: P0122 (tps low voltage), P0141 (oxygen sensor 2 heater performance), P0335 (ckp sensor circuit), P0342 (cmp circuit low voltage), P1629 (anti theft device crank signal low)

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Regal Custom 3.8L Surge VIN: 2G4WB54LXM
Thanks to all that replied. Many tests were performed to try to pinpoint the problem and to diagnose it correctly. We had already done many of the things suggested, but most were retested a second and third time. Fuel pressures were good, ignition patterns wer...
1998 Buick LeSabre Limited 3.8L no shift VIN: 1G4HR52K6W
Thanks for the replies... drive spocket indication was right on...reconditioned .. runs like a champ.. Thanks again... Duane
1991 Chevrolet Corvette 5.7L Poor Idle Quality, Misfire VIN: 1G1YY2385M
After reviewing all of the replies, we were still stuck. Several people had suggested parts to replace, but no tests. Running compression has always been pretty subjective at best, and this didn't seem like a compression issue. We finally decided to replace th...
1993 Chevrolet C2500 Cheyenne 5.0L master cylender VIN: 1GCFC24H2P
The truck is fixed. Sometime I am one dimensional at times. I was stuck on the fack that there was air in the master or ABS system that I forgot everything I know. I want to thank Dave from New Jersy for getting me on the right track. His input was so simple I...
1994 Chevrolet G30 Chevy Van 5.7L Poor Idle Quality, predetonation VIN: IGBJH32K5P
Our previous compression test showed no apparent problems, however upon a retest we found 60psi on cylinders 3 & 5. Blown head gasket all along, between the cylinders. Felt stupid, but hey it happens. Replaced the gaskets, worked the heads, all is well. Most r...
1996 Chevrolet K1500 5.7L MIL Lamp on VIN: 1GBEK19R3T
Not sure if this one is fixed or not. The list of codes we kept getting only had grounds as common components. The thermostat housing grounds were clean and tight. It has a new engine, we theorized that the paint on the new engine was interfering with the grou... Trouble codes: P0161 (02 heater ckt bank2 sensor 2), P0154 (low 02 activity bank2 sensor1), P0102 (maf signal low), P0155 (02 heater ckt bank2 sensor 1), P0135 (02 heater ckt bank1 sensor 1).
1997 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E8V
This vehicle is a mystery. It has not died or blown the fuse all of the time we have had it in the shop. I did replace the wire from the fuse panel to the ECM. We tried to deliberately short the wires that pass through the floorboard connector to the fuel pump... Trouble codes: P1655 (Evap purge solenoid circuit.).
1998 Chevrolet Corvette 5.7L Stall VIN: 1G1YY22G8W
Well this ended up going to the dealer. I was told that the relay that was used in the recall was bad. I did ask the dealer about a second recall regarding a pcm reflash and they said it didn't exist. Thanks everyone for your help!
1999 Chevrolet K3500 7.4L Hard start hot VIN: 1GBJK34J5X
I pull the upper intake friday ohmed and visualy check all injector, all were ok. I then replaced the fuel pressure regulator this helped the hard start alot but not completely Thanks guys for all your help Trouble codes: 1351 (ign coil control circuit high voltage).
2001 Chevrolet Venture LS 3.4L Excessive Emissions, MIL Lamp on VIN: 1GNDX03EX1
Thanks to all that replied. Replies ranged from O2 sensors, vacuum leaks, fuel control problems, excessive backpressure and of course junk (I mean aftermarket) converters. I had several good replies explaining how GM now test converers at idle. It has been a m... Trouble codes: P0420 (TWC efficiency below threshold).
2002 Chevrolet Tahoe LS 5.3L intermediate steering shaft
Thanks to everyone who answered. It seems that this symptom is very widespread and that as of now there is no definite solution. Hopefully GM will come up with a long lasting solution instead of the temporary 'patches' that they have tried so far.
2004 Chevrolet Aveo 1.6L Misfire VIN: KL1TD62604
We replaced all the intake and exhaust valves as suggested by Mark and Justin. The customer has driven the vehicle for a little over a week now with no problems, (She just dropped a plate of caramel brownies off at the shop, and let us know the car was running... Trouble codes: P0300 (Random missfire), P0700 (transmission fault), P1781 (Corrupt engine rpm info to transmission).
1988 Oldsmobile Cutlass Ciera 3.8L No Start, Cuts out
Thanks to all that replied. Most of you that replied indicated that the crank sensor was a common problem. Unfortunately, the customer did not want to dig into it any further. They just bought another car. Sorry I couldn't give a 'fix' but I'm sure you all kno...
1997 Oldsmobile Achieva S 2.4L my sanity VIN: 1G3NL52T9V
Sorry to say I did not fix the noise in this car. Thanks to everyone who replied. Most people who replied to my help request said to check the rear verticle control arm bushing. Even though it looked ok I replaced it. A couple people suggested checking eni...
1999 Saturn SL2 1.9L Exessive vibration VIN: 1G8ZK5274X
We have not yet fixed this vehicle, but we did slightly raise the engine and the vibration almost completely went away! The customer will be back later this week to replace the passenger side top motor mount. We would like to thank everyone that replied VERY m...
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