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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 20, 2015
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Open Help Requests for GM
Help Request Answers
1992 Chevrolet Corvette 5.7L No Start, Stall VIN: 1G1YY23P5N
Hello everyone on iatn. I had this corvette towed in to me a couple of days ago and it was a no start. I had no spark and had no refrence low 8x signal coming out of the opti spark so I replaced the distributor with a reman unit. after that it would start but ...
2000 Chevrolet Impala LS 3.8L No Start, Stall VIN: 2G1WH55K2Y
Vehicle presented as a cranks ok, no-start. Acts like it's in anti-theft mode, "Security" message displays until start attempt, then goes out (normal operation). Will run for about a second on initial start attempt, then stall out and only crank until the key ...
2002 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: 1GNDS13572
This car came to the shop in limp home mode with the service engine soon and the reduce power lights on the scan toll read P1275 accelerator pedal position sensor 1 circuit. All pedal wire continuity tested positive. Both sensors reference voltage reads 7.6v i... Trouble codes: P1275 (Accelerator Pedal posotion circuit -sensor 1)
2012 Chevrolet Sonic LTZ 1.8L HVAC Blower Fan VIN: 1G1JE6SH8C
Customer has to put on 40 to 60 miles before it acts up. Blower fan is inoperative regardless on speed position. She says it seems to act up more the colder it is outside, like below 0. When it acts up, she waits approximately 5 minutes, while still driving an...
2005 GMC Yukon XL 1500 SLE 5.3L Cooling Fans VIN: 1GKFK16T25
Now the cooling fans run all the time when the engine is running, they are on high speed, no codes. I suspect it is to do with the A/C high pressure switch, reads 3.3v running, jump red to gray reads 5v. Black wire shows no continuity to ground, I see it goes ...
2009 GMC Sierra 2500 HD WT 6.6L Mechanical VIN: 1GTHK49689
truck came in the shop running very rough and smoke out of the exhaust raw fuel it had misfire on cylinder 5 cancel the out injectors the only one that made a difference was cylinder number 5 to make a long story short phone date then push rod on the exhaust s...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Chevrolet C2500 5.7L No Start VIN: 1GCGC29R5Y
Thanks for all the helpful replies, got back to this one late and as many of you suggested the coil just poop out. New coil puts out 40-50+ kv on start up and now has the blue spark (wow) These techs got it William [...], ...
2002 Chevrolet S10 LS 4.3L tcc solenids VIN: 1GCDT13W52
My problem got resolved by replacing the TCC,PWM and pressure control solenoids. But when doing so I did not noticed that 3 of the pins from 20 pin connector at the transmission had slightly come off/broke from it and caused a different code. I crossed t 2 o...
2007 Chevrolet Silverado 1500 Classic LS 4.3L No Start, no crank VIN: 1GCEC19X17
After a lot of waiting for the issue to present itself again, the vehicle finally wouldn't start again. I had a Fluke 97 lab scope hooked up to both high speed data communication lines. The HS+ showed virtually no signal with a few negative spikes. I had a fel...
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