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Old 10-31-2009, 07:01 PM   #11
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Changed both knock sensors today. The back one is a SOB but I'm persistent. Took it for a scanning run, and there is absolutely no improvement in KR. I'm getting up to 3.5* KR at WOT under 6 to 7 psi boost. The good news is with the BCS replaced I'm getting up to 9.5 psi boost.

I'm running 93 octane. I have tried 3 different types of gas over the last 6 weeks or so, all with the same results.

As mentioned, I replaced both knock sensors. No improvements.

Any suggestions as to where to go next? Could I be running lean? Should I check fuel trims?
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Old 10-31-2009, 07:21 PM   #12
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Does your scanner allow for averages on the cells for LTFT? If so, post what you have. the best way to find out of your lean is to have a wide band O2. Pull your plugs and look at them, how do they look? Check out your motor/trans mounts, look real close for any shinny metal, that would indicate rubbing and that will set off a knock sensor. Check the exhaust for any contact on metal. Can you hear any add sounds in the engine? Have you upgraded your PCM yet to a performance tune? This can help. A good shift kit has proven to help reduce KR by shifting faster and reducing tranny noise. I've noticed that 2000+ do seem to run a little on the lean side.
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