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Prev Professional Automotive Repair Technical Discussions for August 17, 2004
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Open Help Requests for GM
Help Request Answers
1989 Buick Reatta 3.8L abs VIN: 1G4EC11C2K
Hi all, We have this 89 Reatta with the ABS light on, the code we get is 21 for main valve, when we run Mitchells test it says problem is intermittent, and if you clear the code it will not reset untill car is driven forward it will not reset in reverse. When ...
1992 Buick Roadmaster Limited 5.7L Excessive Emissions, Poor Idle Quality, Surge, Stall, Misfire VIN: 1G4BT5376N
This vehicle has sat for a long time. Each time it has been started, it starts and runs fine. The last time it was driven, it ran great. It will start and run great for 3 to 5 minutes. After that, the idle quality drops, the engine starts to surge, and there i...
1992 Buick Regal Gran Sport 3.8L Misfire VIN: 2G4WF14L8N
Complaint is that on hard acceleration the car misfires right before it shifts, after duplicateing the complaint it appears that the vehicle is limiting RPM to approx.3500- 4000rpm. The one thing that is unusual is that the pcm thinks the car is in neutral or ... Trouble codes: 34 (Mass air flow)
2002 Buick LeSabre Custom 3.8L Speedometer VIN: 1G4HP54K82
Good evening Buick guys, Car came in with complaint of speedometer registering 120 when trying to keep up with traffic. Scanned and found it was approximately 20 mph faster at lower speeds and while doing 70 mph on speedo scan tool read 41mph. We are a small ...
1991 Cadillac Allante 4.5L Battery VIN: 1G6VR338XM
Hello Guys and Girls: Looking for a little input on this one. If car sets 3 to 4 days, battery is dead. I have had this car in the shop twice now, for the same problem. Checked for drains and none were found. Let car set for 4 days, battery ok. Customer takes ...
1964 Chevrolet chevelle mal 327CID horn,interior lighting VIN: 45867B1083
looking for wiring schematics for this 1964. need the horn circut and the interior light circut. if any one has a complete main schematic that would be great. the horn relay is drawing down the battery and when you start the car the right front interior light ...
1989 Chevrolet Beretta 2.8L Cuts out, Stall VIN: 1G1LV14W8J
Hi About a month ago this car was towed in as a no start. We found a #6 cyl shorted injector. We replace injector and everything worked fine. Car came back with same symtom. The injector we replaced is showing 4.1 ohms (should be over 11). When we unplug inje...
1992 Chevrolet Cavalier RS 2.2L Excessive Emissions, Poor Idle Quality, running rich VIN: 1G1JC1440N
This car came to our shop running terrible. The car has no signs of obvious maintenance. The tune up parts were rusted and obviously needed replaced. The crankshaft sensor was leaking oil, so we replaced it. THe tune up helped the problem a little, but still t...
1992 Chevrolet Blazer Cheyenne 5.7L Poor Idle Quality, Stall VIN: 1GNEK18K8N
This '92 Blazer came in originally w/ the guages on the dash all reading lower than normal and the wipers intermittently turning on/ off. The more electrical accessories you ran the more wierd things it would do. Traced that down to low voltage supply in the c...
1995 Chevrolet C2500 Cheyenne 7.4L Poor Idle Quality, Surge VIN: 1GCGC29N4S
This pick-up starts and will die. After starting it will surge severly up and down,sometimes dying. when it is surging the IAC motor opens and closes like it is trying to regulate the idle speed. I checked codes and it has none. While this is occurring I can i...
1996 Chevrolet S10 LS 2.2L Cuts out, Misfire VIN: 1GCCS1943T
Need help please! Changed rear O2 sensor, no change ran same. No MIL light set. No codes in scanner. Starts great runs well except when trying to go up an on-ramp incline to Interstate or cross street fast. Back fires and misses almost to point of dying. This ...
1998 Chevrolet Monte Carlo Z34 3.8L abs VIN: 2G1WX12K8W
customer complaint of abs light on. pulled codes, found c1242, rear motor not holding. no other codes present. after all test ran replaced abs motor pack, ebcm, abs module, and abs relay in that order. we still are losing power to enable relay. starts with 12....
2000 Chevrolet Silverado 1500 5.3L No Start VIN: 2GCEC19T4Y
good morning i have a 2000 chevy pick up with a 5.3 vortec motor that has an intermitten extended crank.truck starts great when cold but after hot soak truck will not start right up when cranked.sometimes may take two key ups to fire up.truck runs great plat p...
2000 Chevrolet Tahoe LT 5.3L MIL Lamp on VIN: 1GNEK13T8Y
This truck is in for a mil. Po446 code evap Alldata chart said to remove fuel cap and check fuel tank pressure. the pressure is 5.33inh20 specis 0inhg then go to tank pressure sensor high voltage. I did the test and replaced sensor and tested tank pressure aga... Trouble codes: P0446
2000 Chevrolet Silverado 2500 6.0L not sure VIN: 1GCGC29U9Y
Hi guys this truck came in with complaint of abs actuating at low speed stop just before you come to rest . it does happen but not every applicatin of brakes.Had code so i did testing for code and replace bad sensor.Light is now out and I have no codes ,but it...
2001 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC12451
Help, I have a 2001 Cavalier driving me crazy! MIL light comes on under 1/2 tank- P0442 EVAP small leak detected. I use a MotorVac evap leak check with a .040 leak gauge. Supposedly if the gauge reads less than the .040 hole, then the leak is not big enough to... Trouble codes: P0442 (EVAP system small leak detected)
2000 Oldsmobile Silhouette GL 3.4L power window VIN: 1GHDXO3E1Y
This one is different! Sitting in the drivers seat @ idle you can hear a slight hum or electrical resonance coming from dash area. With the car running and the windows up, if you hold the left window button in the up position the noise stops until you release ...
1987 Pontiac Grand Am LE 3.0L Stall VIN: 1G2NV54L6H
we recieved this car with a complaint of overheating and dying. we found the wires at the cooling fan had been torn loose and repaired(very poorly)we repaired fan wires using posi-locks and car runs at normal temperature. We also replaced the oil pressure send... Trouble codes: 43 (esc)
1993 Pontiac Grand Prix SE 3.1L alternator VIN: 1G2WJ54T6P
this car came to me last week the customer said he had 12 alternators installed and thay would only last 2 days. so i tested the system checked all the the wires from the alternator to the starter and from the starter to the battery there is no short to ground...
1997 Pontiac Sunfire SE 2.4L Stall VIN: 1G2JB12T6V
hello, and thanks for any light you might shed on this one.this is a regular customer who says this car stalls very intermittently, sometimes while cruising. i have been unable to duplicate this symptom on multiple road tests, scan tool ready. i told the custo...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Chevrolet Silverado 1500 4.8L abs module VIN: 1GCEC14V7Y
replaced ebcm... bleed brake system... ran scanner on it again... had no codes recorded on it... test drove vehicle for a couple of miles... determined all is good. thanx guys
2001 Chevrolet Cavalier 2.2L trac VIN: 1G1JC12441
kept scanner on watched voltage for two days found it to be tps intermitt.
2003 Chevrolet Silverado 1500 4.3L Cuts out, Stall, Misfire VIN: 1GCEC14X33
Well you can sometimes not see the forest for the trees... The great guys at Identifix almost insisted that I change the distributor cap again. I used AC Delco parts but they claim they are not the same quality that you purchase from the dealer. You guesed i...
2001 Pontiac Grand Prix SE 3.8L MIL Lamp on VIN: 1G2WP52KO1
Thanks Mark & every one involved.po420 was not false. coolant leak at plenum was to blame for previously restricted cat followed by mil light. Thanks again Jim Trouble codes: P0420.
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