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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 11, 2015
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1994 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1GBKC34N4R
Ok this one has me. It came in for a intermittent rough run with CEL on. Has codes 33 MAP high and 45 rich exhaust so I started with the Map found it reading 3.6 volts @ idle. Manifold vacuum was low @ 14" repaired a small leak at #6&8 manifold gasket now I ha... Trouble codes: 33 (Map sensor high), 45 (Exhaust rich)
2007 Chevrolet Express 1500 LS 5.3L Mechanical VIN: 1GCEC19Z77
Van came in with bad transfer case (making girding noise while driving) install used one & its all good,week later customer came back & complaining the van roll when its in park ,several times when he park the van, comes back later & the van moved to the middl...
1999 GMC C7500 Topkick C7H042 7.4L No Start VIN: 1GDJ7H1D6X
Hello all, this problem vehicle came in running but missing due to a damaged cam lobe and ruined roller lifter. Replaced cam and lifters and installed new timing chain and gears. everything went together as it should, but engine does not start. The starter cra...
1990 Oldsmobile Cutlass Supreme SL 3.1L Hesitation, Surge, Cuts out, Misfire VIN: 1G3WS54T5L
HI IATN TECHS, Need some help on the car. Customer came in with a intermittent car will stall out. Test drove and confirms engine does stall out after driving for a good 20 - 30 minutes. It stall out at a red light. The RPM somethings will surge a few times, s... Trouble codes: 33 (Map), 35 (Iac)

Fixes & Summaries for GM
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