Knock Question

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Jul 24, 2006 | 08:59 PM

A-Dub

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From: Houston, TX

Knock Question

I am trying to get my car tuned (HPTuners). I keep picking up 4-6 degrees of knock at 3500 rpm regardless of throttle position. I pull timing back and the knock stays there. How should I approach this?

Car has STG II 5.3 heads with 2.02/1.60s and they are milled as well. Running 224/224 566/566 cam. I bought the car that way running a stock tune. I haven't modified the stock timing tables other trying to elliminate knock at the point above (tuning fuel right now).

Last edited by A-Dub; Jul 24, 2006 at 09:58 PM.

Jul 25, 2006 | 01:35 AM

Black02SS

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From: Kokomo, IN

Where is the knock coming from? Is it burst knock?

Jul 25, 2006 | 09:01 AM

A-Dub

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How do I tell if its burst knock? How do I tell where the knock is coming from?

Jul 25, 2006 | 03:10 PM

white2001s10

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From: Fairview Heights Illinois

If it's not throttle dependant then it's most likely false knock.

Jul 25, 2006 | 03:57 PM

A-Dub

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So I guess I should pull even more timing in that area and see if it still shows up? If its still there then its false knock? Definitely not throttle dependent.

Jul 25, 2006 | 04:06 PM

RedHardSupra

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try to pull timing, but if it's something ridiculous like <15 than it's most probably not real knock. another great thing to try is 100octane, since normal gas prices are almost as expensive anyway... if it knocks on 100oct with tame timing, then you gotta start looking elsewhere for reasons.

Jul 25, 2006 | 08:52 PM

A-Dub

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From: Houston, TX

I had replaced the knock sensors with the updated part numbers last weekend. For curiousity's sake, I copied the knock sensor level and knock sensor global gain from a 99 car that came with the new sensors. This reduced the knock from 3-5 to 1-3. Does this tell me anything?