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Professional Automotive Repair Technical Discussions for August 4, 2016 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 2002 Chevrolet Trailblazer LT 4.2L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GNES16S42 vehicle came in with misfire. found it was a coil but put spark plugs in while we were at it. engine was started with throttle body disconnected and when plugged back in idle was off. we performed the battery disconnect reconnect procedure to a success and the... Trouble codes: P0340, P1171, P0130 |
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| 2004 Chevrolet Trailblazer LS 4.2L Unknown VIN: 1GNET16S04 Vehicle came in with compressor clutch will engage on when you hit the A/C on switch and then just stop and if you turn off the vehicle and the A/C switch then restart it would do the same thing. so we put the gauges on and we have high side on reading 75 and ... |
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| 2004 Chevrolet Cavalier 2.2L No forward Gears VIN: 1G1JC52F74 Vehicle lost forward gears, no warning. Just lost gears. It has reverse. Scanned and got no codes ... Thank you for helping ... |
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| 2013 Chevrolet Spark LS 1.2L A/c compressor VIN: KL8CA6S96D Hey guys I R&R high side pressure hose with pressure switch (was leaking) on this vehicle now a/c compressor won't come on, I can see with my scanner that there's no "a/c request on ecm as Im pushing on & off the a/c button I can see on the bcm that as I turn ... |
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| 2014 Chevrolet Traverse LT 3.6L Hesitation VIN: 1GNKRHKD7E Good afternoon. I have this 2014 Chevrolet Traverse that sometimes hesitates on accel after a decel. I would push the pedal around an inch just to get the engine to respond and take off. Does not do it every time. Has plenty of power when it does respond. No c... |
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| 2005 Pontiac Sunfire 2.2L Running Lean VIN: 3G2JB12F55 What could cause vehicle to run lean? LTFT at +25%? Smoke tested and no leaks found Fuel Pump and Filter previously replaced At idle there is 40 PSI at the Rail (manual gauge) KOEO Pressure goes up to 30-40 PSI and immediately drops back to 0 Trouble codes: P0171 (Fuel Trim System Lean) |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2000 Chevrolet C3500 7.4L No Rear Brakes VIN: 1GCGC33J8Y Finally got rear brakes working, i dont know if you guys have ever tried this, we disconnected rear brake hose and applied shop air pressure to the line (blowing air towards the ABS Module) then we re-bled all the brakes, brakes are now working perfectly. than... |
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| 2002 Chevrolet Avalanche 1500 5.3L Misfire, MIL Lamp on VIN: 3GNEC13T92 Thanks for the many replies. A variety of suggestions. Intake leaks, Fuel pressure regulator, Bad coils. however it is the right side converter that is bad. Don't remember who suggested it first, but I removed the RF O2 sensor and when running the misses w... Trouble codes: P0430 (Cat efficiency low bank 2), P0300 (Miss), P0101 (Maf out of range). |
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| 2003 Chevrolet Silverado 2500 HD 6.6L Compressor VIN: 1GCHK29123 I'll add a little info before I close this post out. The A/C system is a manual system and I'm loosing voltage at the coil when it acts up. When it does act up the PCM does not ground the relay. The customer hasn't been back in for me to check it again. When a... |
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| 2002 GMC Sierra 3500 6.6L pressure VIN: 1GDJC34162 First, I didn't put in enough digits for the mileage. It has 335,830 miles. Well, I feel like an idiot! The problem was blocked fins on the radiator and inter cooler. There was no debris between the two, so I just blasted some water where I could reach and let... |
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| 2006 GMC Sierra 3500 SLT 6.6L Cooling Systems VIN: 1GTJK33236 Thanks for all the help diesel guys! Water pump was in deed leaking. After replacing, I vacuum and pressure tested cooling system and could not duplicate any leaks at all. Even the anticipated exterior head gasket leak did not reappear ( I don't know why thou... |
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