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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 4, 2004
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1992 Buick LeSabre Custom 3.8L No Start, MIL Lamp on VIN: 1G4HP53L8N
will not start when hot let sit 10-15min. then it will start I have no spark or inj. I have power& ground to icm also a good crank signal tested power&grounds at ECM thay are good I have installed a new ICM not changes can the ECM have anything to do with spar... Trouble codes: 41 (cam sensor)
1999 Cadillac DeVille 4.6L Poor Idle Quality, Misfire VIN: 1G6KD54Y5X
Car came in with a rough idle cold complaint. Problem occurs when the car is first started. It will always do it if it sits overnight, it may also do it after sitting as little as an hour. Car has to be driven to continue to have the problem. If the car misfir...
1999 Cadillac Catera 3.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: W06VR52R4X
vehicle has random misfires on start up,noticed as soon as completed warm up cycle vehicle smoothed out.replaced plugs & 246 coil pack.coil pack was rusted in housing & 246 was prominent missies at first then switched to 135 and now completly random.cleaned ma... Trouble codes: P0300, P0304, P0305, P0301, P0306, P0302
1992 Chevrolet C1500 454 SS 7.4L rear antilock VIN: 1GCDC14N0N
Antilock brake light (which is also parking brake light) comes on at 35 mph every time and stays on till vehicle is shut off. Tried to pull codes there isn't any. It will stay off until vehicle travels over 35mph. used the GM trouble tree which points me in th...
1992 Chevrolet Camaro RS 5.0L Vibration VIN: 1G1FP23E8N
Severe vibration...once the car has warmed up it usually vibrates in overdrive at speeds 50mph and above while accelerating with a moderate load (incline). If it begins to vibrate and you take it out of overdrive, the vibration will stop. As the car continues ...
1994 Chevrolet G20 Chevy Van 5.7L Ring & Pinion
This Van came into my shop With a complaint of Differential Whine from 40-50mph and Back again at 75mph. Upon removal of the cover I discover Normal Wear to the ring @ Pinion And all of the Bearings. Limited Slip Was worn severely. The customer opted to replac...
1998 Chevrolet K1500 Cheyenne 5.7L No Start, NO DATA VIN: 2GCEK19R5W
Vehicle was towed in , no-start. Will crank start run for 3-5 sec. then die. Not able to communicate with computer. Used two different scanners. Checked voltages at diagnostic connector, good. Hooked up scope to pin#2 get a varable square wave. Also checked vo...
1993 GMC C1500 Sierra SLE 5.7L MIL Lamp on VIN: 1GTDC14K6P
this veh. has a hard fault code 43 we have changed everything in the system according to the wiring schematics . the resistance of the wire from the sensor to the computer is good & not grounded we cheched the ign module wiring still has a hard fault . veh. dr... Trouble codes: 43 (knock sensor)
1990 Oldsmobile Delta 88 Royale 3.8L Hesitation, Cuts out VIN: 1G3HN54COL
customer replaced his iac due to continues to buzz once shut off for any amount of time. now you can feel it but not here it. why would the iac motor continue to runn hours after car shut down? i replaced the o2 sensor due to slow readings and took to long to...
1998 Oldsmobile Intrigue 3.8L abs VIN: 1G1FRTGHQW
Hello to all GM techs, this is a strange one. This vehicle came into the shop with a binding ignition switch, we replaced the switch and had to relearn the key to start the vehicle. Anyway that worked fine, now the customer is complaing of all 4 wheels locking...
1993 Saturn SW2 1.9L Excessive Emissions VIN: 1G8ZJ8573P
This car came in failing emissions. High on HC and CO. 74% of failure is on acceleration. Aftermarket cat was empty and replaced with an OE, a new O2 sensor, and updated the coolant sensor and harness connector. Still fails on HC, and CO is lower but just unde...
1994 Saturn SL1 1.9L 2-3 shift VIN: 1G87H5592R
Techs, I feel like the Saturn transmissions have a different shift strategy than common GM or Ford or Chrysler automatics. I am surprised at the enguagement of the pwm converter clutch in 2nd gear, it makes early 2-3 and 3-4 shifts too hard on the engine. Is ...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Skylark Custom 2.3L engine temp. VIN: 1G4NV55D5S
I'd like to thank all who took the time to reply. Gerry from Michigan and Chris from North Carolina hit the nail on the head. When I first checked for C/O with my block check, it came out negative. After some exhaustive disassembly, I went back and checked for...
1997 Buick Century Limited 3.1L windshield wipers VIN: 2G4WY52M8V
found broken cam on the crank arm upon removal. most posts refered to bent or broken stop tab. this was also apparent on this vehicke. the tab was bent back into respective position and the new crank arm was installed ( dealer only part approx $55 cost)fairly ...
1988 Chevrolet S10 Blazer 2.8L No Start VIN: 1G8CS13R8G
Well I and my tech over looked the obvious and tried to make this harder than it was I appoligize first off for the long time it has taken me to post. We have been covered up! Praise God thats a good thing these days. Anyways it turned out that Dan from Texas ... Trouble codes: 24 (no vss), 32 (egr fault), 53 (fuel pump relay open), 45 (rich).
1998 Chevrolet K3500 Cheyenne 7.4L Poor Idle Quality, Misfire VIN: 1GCHK33J5W
Basic were gone over (plugs,wires,cap,rotor,fuel pressure & volume,regulator,injectors,vacuum leaks,compression) more than once in most cases. Vehicle had restricted exhaust (high backpressure @ 2500 rpm) but don't think it was causing miss. Customer didn't wa...
1991 Oldsmobile Cutlass Supreme 3.1L Cuts out, Stall, MIL Lamp on VIN: 1G3W754T6M
I must say--there has never been a better resource that I have found to exchange ideas and suggestions than iATN. I received 11 replies to my plea for help on my Grandmother's 91 Olds Cutlass Supreme which was repeatedly flagging code 42 (EST circuit problem) ... Trouble codes: 42 (Electronic spark timing problem).
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