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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 7, 2005
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Open Help Requests for GM
Help Request Answers
1988 Cadillac Eldorado 4.5L stereo VIN: 1G6EL115XJ
I'm interested in hearing from any tech with experience replacing the factory Delco Bose Radio/tape deck with an aftermarket unit. This is my personal vehicle, bought it from the dealership for $100.00. I have an Alpine CD deck I'd like to install. My question...
2001 Chevrolet Tahoe 5.3L Autoride VIN: 1GNEK13T01
Need some help with this one guys. Is there a way to disable the autoride system on this Tahoe. Customer has had nothing but problems since vehicle was new. If I pull fuses the service ride control message comes on. Customer wants message gone and autoride tur...
1992 GMC K3500 Sierra 7.4L No Start VIN: 1GDJK34N5N
I have a 1992 GMC 1 ton dually with a 454 TBI. When it cranks it has fuel but no spark. I have current to the coil and distributor and both are new. I have tested the 4 wires going from the module to the PCM for continuity and they are fine. I have also tried ...
2002 GMC Yukon XL 1500 SLE 5.3L Assist VIN: 1GKFK16ZG2
This vehicle loses steering assist at low speed, specificaly when parallel parking (engine at idle or slightly above and steering wheel turned nearly to max). We replaced OE pump due to broken shaft with Delco reman. Subsequently the pump was replaced twice ag...
1996 Oldsmobile 88 Royale 3.8L Surge, Cuts out, MIL Lamp on VIN: 1G3HN52K7T
This car came in with a CEL and intermitant stumble. Pulled the codes and checked failure records. P0102 came up and under failure the baro read 60iHg. Followed test procedures and was instructed to replace MAF. Replaced with aftermarket MAF. Still same proble... Trouble codes: P0120 (maf frequency low)
2000 Pontiac Grand Am SE 3.4L MIL Lamp on VIN: 1G2NF52E2Y
I have this problematic grand am. It keeps setting a p0442 code for evap small leak. Each time I check it out I can draw a vaccum on the evap system and it will hold it all day. I'm not sure why the scan tool reads a negative vaccum for the fuel tank pressure.... Trouble codes: P0442

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Regal Limited 3.8L MIL Lamp on VIN: 2G4WD14L5L
I wish to thank everyone for there time and much effort on this car. Also I would like to thank IATN for posting this. After rechecking all grounds and power pins,checking all wiring again,I almost gave up on this car.Something was amiss and I could not figure... Trouble codes: 21 (throttle position).
1995 Buick Park Avenue Ultra 3.8L idle-noise-vibration VIN: 1G4CU5219S
Most replys were to replace harmonic balencer, it was new, had a few on checking tensioner travel, some suggested reinstalling the old pulleys however they were not avaliable and were wearing with flat spots, the bearing in the new pulley on tensioner had gone...
1995 Buick Skylark Custom 2.3L No Start VIN: 1G4NV55D4S
We replaced the timing chain kit when we found that the exhaust cam was out of time with the crank and intake cam. Interestingly enough, the intake cam had remained in time when the chain skipped a tooth. The clue to this came due to the apparently low compres...
1991 Chevrolet C1500 454 SS 7.4L Surge, Cuts out, MIL Lamp on VIN: 1GCDC14N9M
This vehicle is fixed!! I originally saw the PCM commanding the TCC on and off at cruise with no apparent reason. This was the only symptom at the time. I checked the TPS, MAP, fuel pressure, battery, all related wiring, and performed an O2 feedback test. Clie... Trouble codes: 45 (Exhaust Rich).
2002 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JH12FQ2
The fix was checking the timing on the timing chain. Found the intake camshaft was half a link advanced. We retimed this thing and all is well no rough idle or shake. LIVE AND LEARN! Trouble codes: P3000.
1985 Pontiac Firebird Trans Am 5.0L Poor Idle Quality, Stall VIN: 1G2FW87F0F
thanks to all that replied. this car has been quite a headache. performed all of your recommended tests and found everthing was testing ok. no signs of a vacuum leak. finally after extensive testing found the cause of the lean condition and stalling. found the...
1994 Pontiac Firebird Formula 5.7L Misfire, Spark Knock VIN: 2G2FV22P3R
Hello Fellow Techs, Sorry for the delay in responding (over a month!) customer travels a lot and wasn't able to bring the car back until this Monday. Took the entire week to work the kinks out, but vehicle runs great and customer is happy. Yippee!! Had many ex...
1999 Pontiac Grand Prix GT 3.8L entire electrical systems VIN: 1G2WP12K9X
thanks to everybody that replied.the concern has not happened for about a month now and i have not had a lot of time to attempt to duplicate it.once i eventually figure it out,i will post what i find.
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