dang it i was gonna throw out bad knock circuit but mod beat me to it. doesn't have to be the sensor could be the harness too. If adding an an octane booster (recommend NOS in the box or the lucas one in the orange bottle) mostly gets rid of it you can either just drive forever to get somewhere with 93 or take it in and have the dealer use the consult3 on it. He confirmed the problem so it's already warranty and your golden.
Edit: until you start getting gasoline blended for -30deg temps don't complain about yearly blends.
Last edited by 1slow370; 11-12-2009 at 08:34 AM.
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