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NCHEVYHEVN -> RE: P0302=Cylinder 2 Misfire Detected Need Help!! (8/20/2006 12:44:07 PM)
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quote:
ORIGINAL: kcb37
NCHEVYHEVN when you have a high compression engine you need a higher octane so you don't have pre detonation, on a fuel injected, and I belive a throttle body, the knock sensor will change the timing so you can run a lower octane. If the Knock sensor goes bad and won't adjust the timing then 87 octane may not work, but if you put in 91 it has a possablility of running better because the timing won't need adjusted to make it run right. But then the knock sensor could just be all messed up and a little higher octane rating wouldn't do anything. If you can't figure it out from this I don't know what to tell you.
First his motor isn't a high compression motor so 87 is fine.
Second all the knock sensor does is retards the timing. The knock sensor is basiclly just an ear on the motor listening for detonation.
Third timing doesn't change the compression ratio. Timing is just when the spark plug fires. Whether it fires earleier or later it still fires. And gas is high flamable to whether it's 87 or 110 it's still going to fire. Detonation or knock is when it does prematurly because of like you said a high compression ratio and too low of octane or hotspots in the cylinder from carbon deposits or the wrong plug heat range.
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