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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 11, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1995 Chevrolet K2500 Cheyenne 6.5L Excessive Emissions, Hesitation, MIL Lamp on VIN: 1GCFC24F1S
This is my truck and it suddenly started belching out a lot of black smoke on acceleration. Mil was on and recovered codes 33, 99.I have vacuum at the EGR all the time and it is opening the EGR when it should not. I think that it should vent the vacuum untill ... Trouble codes: 33 (EGR Controll pressure/ Barosensor circut Highlow vacuum), 99 (pedal position 2 / 5volt ref. fault.)
1998 Chevrolet Blazer 4.3L 4wd system
This one really has me stumped. I had a blazer come in with no 4wd. Test showed the switch shorted on the front axle electric not vacuum and the selector switch was also shorted. Replaced switches then went on. Found that the atc fuse was blown from the underh...
1991 GMC S15 Jimmy SLE 4.3L front diff. & transfer case VIN: 1GKCT18Z1M
4 wheel will not enguage - installed new vac sensor - still inop and seems to work backwards with no vacuum in 2wd but has vac in 4wd - still will not lock front axle t case ok and front shaft ok . any help would be great thanks
1994 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN52LXR
This vehicle has low mileage and is well taken care of. The first start up in the mornings, extended cranking and it finally starts. Once it starts,it may die once and then restart right away. It runs very good, no stumble or hesitation, idles and drives good,...
1997 Oldsmobile Achieva S 3.1L Ignition VIN: 1G3NL52M0V
Im not big on GM experince (Toyota's my game) hopefully someone can help me out. Vehicle came in with a broken ignition lock cylinder and worn out ignition key, we replaced the lock cylinder and key, I noticed a security light on the dash came on after the rep...
1999 Oldsmobile Intrigue GLS 3.5L engine VIN: 1G3WX52HXX
Once this engine is fully warmed up there is an odd noise in the top end of the engine. Checking with a stethoscope at various areas near the intake manifold it sounds the same. In other workds, I have not been able to tell exactly where it is coming from. It ...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Park Avenue 3.8L Cuts out VIN: 1G4CW53LXM
Hi, Pulled the Cam Sensor on the timing cover and brought the cam magnet to the hole. I put a long small screwdriver to see if the magnet was good and the magnet had nothing pulling. I went to the parts house and purchased a new timing set with a new magnet ... Trouble codes: 41 (cam sensor).
1998 Chevrolet K1500 Cheyenne 5.7L trans VIN: 2GCEK19R6W
Most of you were correct. The white wire that feeds fuse #20(trans)go to ignition switch. After i took air bag, steering wheel, and column covers off i wiggled the white wire and bingo, that was the problem. Going to drive with bottom column cover off so can g...
1996 GMC Jimmy 4.3L 4 wheel high VIN: 1GKDT13W3T
Once again, the best tool in my shop (iATN) has come through. Most replies were for the encoder motor. This confirmed my testing but aked for guidance on a system I was not familir with. One reply said to get the part from Dorman which was considerably less th...
1998 Pontiac Firebird Firehawk 5.7L Poor Idle Quality, Surge, Stall VIN: 2G2FV22G0W
Thank you all for replying. We wanted to replace the intake gaskets, as suggested, the customer wanted to repair himself. So, we shall see. Sometimes the customers can sure tie your hands & feet when you are being generous. Trouble codes: P0300 (misfires on several cylinders).
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