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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 15, 2021
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Open Help Requests for GM
Help Request Answers
1984 Cadillac DeVille 4.1L headlamps VIN: 1G6AM6989E
looking for some old information, alldata, and google search comes up empty. this caddy has guide-matic headlamps, I have no high beams flash to pass works correctly. wiring diagram doesn't show clear path of manual operation. I have put a dimmer switch in...
2000 Chevrolet C3500 7.4L No Start VIN: 1GBKC34JXY
Happy Monday everyone! Having a difficult time with this 7.4 C3500HD. Cranks but will not start. I have no injector pulse, have spark and fuel. Crank and cam sensor scope out properly, power and grounds to VCM are good, no codes. Checked injector resistanc...
2007 Chevrolet Silverado 1500 Classic WT 4.3L Poor Idle Quality, Hesitation, Cuts out, high trims VIN: 1GCEC14X27
Got a tough one. Lean codes for both banks. Rough idle intermittently, extended crank, intermittently and intermittently engine bogs down and no throttle response, briefly. Noted trims max out high under load, but trims normal at idle or cruise. Every time... Trouble codes: P0171, P0174
2006 GMC Sierra 1500 SLT 5.3L No Start VIN: 2GTEK13T46
Hello everyone, I am having a problem and hope someone has seen this before or can point me in the right direction. This 2006 GMC Sierra has a intermittent crank/no start. If you crank in for 10 seconds and let off the key and crank it again it starts ever...

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Skylark Limited 3.3L Excessive Emissions, Runs Rich VIN: 1G4NJ14N4P
Thanks to all who replied. For those of you who pointed out that fuel injectors were problematic on these vehicles, thank you. The injectors were the cause of this problem. We dug out an old Matco fuel injector trigger device, charged the fuel system and trigg...
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