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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 17, 2006
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Surge VIN: 1G4HR53LOP
This Buick leans out badly on accelleration cold.The O2 voltage drops way low and the injector waveform shortens way up. Intermittantly the cooling fans will come on on cold start then cycle off, thats why we tried a different ECM. All three coils ohm within s...
2002 Cadillac Escalade 6.0L stability VIN: 1GYEK63N52
Came iin with complaint "service stability system" lamp on. My modis won't get me into the suspension, so I scanned ABS, had code C0286 "ABS lamp ckt short to B+/MPA switch ckt". There is a TSB on this switch so I replaced it. Light still comes on and same cod...
1987 Chevrolet Sprint 1.0L Excessive Emissions VIN: JG1MR2151H
this car is in my own fleet of rolling junk.at 2500 rpm engine will run full rich. the duty cycle will go to 10% and o2 will read 1.0v. while running full rich i can pull arm on wot switch and system will go into closed loop. the computer is forcing system ful...
1989 Chevrolet Corsica 2.8L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G1LT51W4K
hello car came in customer complained running rough. Checked coil output at coils very good. Checked output at wires very good. Checked plugs they were new but very black running rich. So replaced plugs changed oil . Checked fuel pressure normal 35 to 45 . Che... Trouble codes: 45 (running rich)
1994 Chevrolet Lumina Euro 3.1L Misfire VIN: 2G1WN14TXR
Hello-thanks in advance for your time and effort. Have a 1994 chevy lumina-3.1.Under a load seems to drop a couple of cylinders.Tried plugs and wires first-same results.Check injectors all checked and sprayed good-went ahead and put new ones in-same results.Tr...
1995 Chevrolet Tahoe LS 5.7L Mechanical VIN: 1GNEK13K1S
this truck came to us with the only repair to do was to install new shoes, well i told him with the miles on it I would also install new springs and wheel cylinders and the drums look bad so he said ok. Well everything went great and worked well untill after t...
1998 Chevrolet K2500 Cheyenne 5.7L Flex Plate VIN: 1GCGK24R5W
Thanks in andvance for your help. About 6 months ago we replaced the flex plate in truck. The center was broke out around all the crankshaft bolts. We installed a new flex plate and all was well until today. The new flex plate was broke just like the old one. ...
2002 Chevrolet Trailblazer LS 4.2L starter VIN: 1GNDT13S62
Truck was towed in for no start/no crank and also couldn't get key out of ignition. push manual button on lock solenoid then can turn key back and get out of cylinder. found fuse #34 in engine fuse box blown(which powers ignition switch). install new fuse and ...
1998 Oldsmobile Aurora 4.0L starter VIN: 1G3GR6C8W4
Starter engages but does not spin. Car will start if jumped off a running vehicle. Jump box or a battery with good cables does nothing. After jumping with a running vehicle, car will start for several days under any conditions. Vehicle battery cables and conne...
1988 Pontiac Firebird 5.0L Cuts out, MIL Lamp on VIN: 1G2FS21E8J
This one is a PIP ! The closer to the repair facility, the less often it occurs. the customer, prior to giving it to me, replaced damn near everything. ECU, ESC, Knock Sens, Coolant Sense, distributor, C-R-Wires, and a partridge in a pear tree. We get with a ... Trouble codes: 43 (ecm low voltage at esc / knock sens 5 seconds)
2000 Pontiac Bonneville SE 3.8L power windows and door locks VIN: 1G2HX54K5Y
2001 Pontiac Grand Am GT 3.4L coolant VIN: 1G2NW52E51
Hello folks, I got one here that i need a little direction on. Bottom line I have Oil in the coolant, I am suspecting head gaskets, but would like to put it past you folks to see if there has been some pattern failures, the engine has no oil comsumption, only ...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Buick Century Custom 3.3L Surge, Cuts out, Stall VIN: 1G4AH51N1K
well, thanks to everyone who replied to my message. a lot of you hit the nail on the head. it seems that the tcc solenoid was the whole problem. i disconnected the solenoid and gave the customer the car back. she has been driving it since with no problem. now ...
1993 Buick Regal 3.1L triggering codes fal VIN: 2G4WB54TOP
after checking all grounds and sensors both scanners reacted the same so i went up 1 year to 94 and everything works fine. the car is a 93. i have got readings that were off before when entering wrong year in scanner but never kicking codes.very strange all is...
1993 Buick LeSabre Limited 3.8L automatic air/heat VIN: 1G4HR53L5P
thank you to all who responded. I replaced the actuator and the problem was solved. Thanks for your help.
1994 Buick Skylark Custom 3.1L egr VIN: 1G4NV55M6R
Wow! Lots of great, helpful replies! Including one that implied that I was lying! This one is for the records, obviously, because of its bizarre nature/fix. After eliminating all the obvious, such as intake gaskets and such, the customer authorized removal of ...
1998 Buick LeSabre Custom 3.8L starter VIN: 1G4HP52K7W
Many thanks to all who responded, most replies said to look at the grounds, all were good, we had no 5 volt reference to the alarm module from the pcm. we had a bad connection at the bulk head connector c101, repaired and now had the 5 volt reference (needed f...
1999 Buick LeSabre Custom 3.8L windows,locks,dash warning lights. VIN: 1G4HR54KOY
Thanks to everyone for their thoughts and comments. Last week the shop had the chance to 'test drive' a TECH 2 and a Master tech, we were able to pull more codes from all modules. All codes pointed to a class 2 communication proublem. I was told by a GM tech t...
1998 Cadillac DeVille Concours 4.6L security light VIN: 1G6KF5499W
thanks to every one who replied.the car also had some other elec problems at the time which i didn't know about. the fix was replacing the neg battery cable due to high resistance. the cable got so hot you couldn't touch it.
2000 Cadillac Catera 3.0L Unknown VIN: W06VR54RXY
Thanks For Your Help. Most All Replys Thought It Could Be The Defrost Motor, But You Have To Pull Dash,Console And Steering Column. I Made An Est For The Owner. At This Time They Picked The Car Up To Use This Weekend And Said They Would Contact Us Later. All O...
1989 Chevrolet C1500 Cheyenne 5.7L No Start, cranks VIN: 1GCDC14K7K
Thanks everyone for their input. Everyone had pretty much the same 'hunch' that I had an electrical, or device problem. I found a broken wire in harness. The wire going from dist back to ecm. No signal being received from dist to fire coil or injectors. It was...
1995 Chevrolet Cavalier 2.2L Stall VIN: 1G1JC5249S
Thank you all for your input. Everyone is truly a professional and I enjoy using this site because of this!!! This vehicle actually had three problems going on at the same time when the vehicle warmed up. During diagnostic checks and info sent to me, this vehi... Trouble codes: 27 (quad driver fault).
1997 Chevrolet C-Series Kodiak C7H042 6.0L right tank not pumpi VIN: 1GBJ7H1PXV
Thanks go out to Nick from NH who was in the know. This system of dual tanks takes fuel from the right side tank to equalize the left tank. The left tank feeds the motor with fuel. If the right side tank sender reads lower than 2 ohms the transfer pump will no...
1998 Chevrolet C3500 Cheyenne 6.5L Misfire VIN: 1GBKC34F8W
thanks again to all who replied,,, we had another pump sent which we installed, still same problem, we talked to a man from stanadyne corp who looked into this for us, we had installed a dipaco rebuilt pump the man from stanadyne went to a meeting that day and... Trouble codes: 263 (misfire see text many misfire codes).
1999 Chevrolet Tahoe LS 5.7L No Start, Poor Idle Quality, Stall VIN: 1GNEK13R9X
OK, it's over... We took it our back and shot it! (No, not really.) It is FIXED!!! Thanks to everybody and to this great data-base. It turned out to be the fuel pump as 95-percent of you suggested. What sent me off in the wrong direction was that I replaced th...
2003 Chevrolet Suburban 1500 LS 5.3L Poor Idle Quality
Thanks to all who replied. I did finally find something in Alldata about getting the ECU re-programmed, so I sent the customer to the dealer to get that done. I had forgot to put in the original post that I had cleaned the throttle body when I replaced the man...
1994 GMC K1500 Suburban SLE 5.7L heater core VIN: 1GKFK16K5R
Well all good info from those that responded. Unfortunately the cust traded that rig in so we will never know what became of heater core #4. Paul
1997 GMC K1500 Sierra SL 5.7L Excessive Emissions VIN: 1GTEK14R5V
We found that the pink wire going to the rear o2 sesnor on the right hand side had rubbed a sharp steel edge on the underneath body right above the transfer case where the is a very limited amount of room. Trouble codes: P0102 (mass air flow), P0340 (cam sensor).
2001 GMC Sierra 2500 HD SL 8.1L turn signal switch VIN: 1GTHK29G71
Thank You everyone for your rsponses!!! Could not have done it without your help. Got the tilt lever out by pulling it straiht out as I was told and yes it is in very tight. To get the air bag out, had to use a screw driver to release the retaining springs. On...
1998 Oldsmobile Aurora 4.0L Center vent airflow VIN: 1G3GR62C4Q
Thanks to the few guys who responded, but we fixed this one with some southern ingenuity. As stated, we could find no problems with any doors. I think customer probably had been driving with side vents closed or dampered for a period and when they were opened ...
1998 Saturn SL1 1.9L 2-3,34 shift VIN: 1G8ZH5287W
Sorry for so closing I was out sick and the costomer traded the car.He can in today to show be his new Saturn.Thank for the help all you iatn people are graint.Thank You John
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