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Prev Professional Automotive Repair Technical Discussions for April 30, 2020
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Open Help Requests for GM
Help Request Answers
2003 Chevrolet Silverado 1500 5.3L Surge VIN: 2GCEK19T13
This truck runs poorly hot or cold. Scan data shows misfire on cylinders 7, 8 and occasionally a little on 2. I removed all the plugs and performed the compression test and then gapped the plugs. #8 plug was fouled. I removed the RH fuel rail and swapped #... Trouble codes: P0300 (Multiple Cylinder Misfire), P0300 (Multiple Cylinder Misfire), P0300 (Multiple Cylinder Misfire), P0300 (Multiple Cylinder Misfire)
2008 Chevrolet Tahoe LTZ 5.3L Misfire VIN: 1GNFK13038
Intermittent cylinder 7 miss fire. GM techs please help!. This 08 Tahoe has an intermittent miss fire that occurs only on light acceleration, and occasionally on deceleration. A ten mile test drive will generally result in a 10 to 15 second long miss fire ... Trouble codes: P0300
2016 Chevrolet Camaro SS 6.2L Misfire VIN: 1G1FF1R77G
Quick question for you GoodWrench Boyz. Got this '16 Camaro 6.2 litre that sets a P0106 MAP Sensor Performance code as soon as you turn key on and will not clear. MAP sensor reads 3.9 volts koeo. Since the beginning days of the MAP sensor as I remember the... Trouble codes: P0106 (MAP Sensor Performance)

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Century Custom 3.1L Hesitation, Surge, Misfire, MIL Lamp on VIN: 2G4WS52J35
Well, I had a ton of good info from everyone which allowed me to rule out things as best as possible. This car is in rough shape, but meant a lot to the customer, so I did quite a bit of "free labor" because of the extent of work needed. It was what I thought.... Trouble codes: P0300 (Randon Misfire).
2005 Chevrolet Silverado 2500 HD 6.0L Misfire VIN: 1GCHK29U55
I have gotten busy and haven't done anymore diagnostics. I suspect the also plugs thread insert is causing an intermittent hot spot. I'll report when I figure it out. Thanks for the help. Trouble codes: P0302 (Cylinder 2 misfire), P0300 (Random misfire).
2008 Chevrolet Silverado 2500 HD WT 6.6L MIL Lamp on VIN: 1GCHK29638
Thanks for the replies, The EGR cooler was in fact plugged up as well as the intake port it's bolted to. I soaked it over the weekend in Purple Power degreaser and it cleaned up perfectly. In answer to my original question, when the EGR is activated at idle th... Trouble codes: P0401 (EGR low flow), P003A.
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