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Professional Automotive Repair Technical Discussions for December 19, 2017 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 2007 Chevrolet Cobalt LS 2.2L No signal to the starter [aka crank] relay VIN: 1G1AK55FX7 Customer has very little money to fix vehicle. My AllData is a bit confusing, as it suggests that the anti theft system will kill the fuel system. This car will start & run if I jumper the starter relay. It appears that the PCM is not providing the ground ... |
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| 2007 Chevrolet Tahoe LTZ 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNFC13027 Cylinder 2 misfire. The car drives great with no misfire or hesistation but has a very slight miss at idle only. It is barely noticeable but when watching the misfire counter it slowly goes up on cylinder 2. Intake Vacuum is very steady 20". I have swapped... |
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| 2008 Chevrolet Uplander LS 3.9L Cuts out VIN: 1GNDV23W28 Got this Uplander with no RPM signal from crank sensor. Got the 5v reference, 5v signal circuit and good ground to sensor. Strange thing is signal voltage goes from 5v to .74 volts as soon as you plug the crank sensor in. Voltage never changes once you spi... Trouble codes: P0335 (no crankshaft sensor signal) |
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| 2007 GMC C4500 Topkick C4E042 6.6L Tcc VIN: 1GDE4E1927 Local trans shop brought this truck to us after rebuilding tranny and now has code p0741-00, TCC system stuck OFF. Reason said shop did the job was that torque converter got so hot it turned blue. Customer regularly tows a heavy trailer. We checked wi... |
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| 2009 GMC Sierra 1500 SLE 5.3L MIL Lamp on VIN: 3GTEK23319 Truck sets p1174 within a few miles, it has a slightly rough idle at times but no misfires showing up. I have swapped all injectors from bank 1 to bank 2, cleaned fuel system, and swapped o2 sensors from bank 1 to bank 2. Compression is 180 on all cylinder... Trouble codes: P1174 |
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| 2007 Pontiac Vibe 1.8L Low voltage at idle VIN: 5Y2SL65857 vehicle cam in for running rough. Checked codes and data and no codes or misfires shown. only runs rough at idle and alt output starts at 12.4 volts and drops to 11.8 at idle the longer it runs. Voltage goes to 14.2 volts at 800 rpms or more and engine doesn't... |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 2000 Chevrolet Silverado 1500 5.3L No Start, Poor Idle Quality VIN: 1GCEK14TXY Thank you for all of the help offered on this one but it turned out to be a bad battery. It turned over the truck just fine but it would only crank it for about 5 or 6 seconds before starting to slow down. We noticed that if we hooked up our 10 amp charger and... |
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| 2006 Chevrolet Equinox LT 3.4L No Start, Poor Idle Quality, Stall VIN: 2CNDL63FX6 Dirty throttle body. Thanks guys. What thru me was the security codes. Doing a little research the P1612 will throw if it doesn't start, whether it is antitheft or not. Trouble codes: P1626 (Theft Deterrent Fuel Enable Signal Lost). |
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