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04-24-2020, 09:22 PM
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#1 |
 Drives: 2012 SS Join Date: Aug 2017
Location: Lake Worth, FL
Posts: 99
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P0306 2015 SS/Auto L99
Out of the blue the car started throwing this code with reduced power and all the usual light. Changed the wire and plug but no difference. The strange thing is when driving, the reduced power stops and it drives normal - starting around 20-25 MPH. As soon as I stop, I get the same behavior again.
The car also has a loud knocking/rattling but it goes away. This seem like it may be an lose exhaust. I put a stethoscope to the different cylinders and they don't really sound much different from each other. #6 might have some extra noise but it would be very slight. Should I replace the coil pack and see if that fixes it? Next I'll try a compression test. |
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04-26-2020, 12:26 AM
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#2 |
 
Drives: 2011 2SS, 2006 GMC Sierra Join Date: Jul 2019
Location: MA
Posts: 243
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Remove the valve cover on bank 2 (passenger side) and check the rockers
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04-26-2020, 04:04 PM
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#3 |
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Drives: 2012 SS Join Date: Aug 2017
Location: Lake Worth, FL
Posts: 99
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Looks like a collapsed lifter ugh
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