Knock at low loads
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This is a discussion on Knock at low loads within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; Hi, it was a brisk day today and I did some logs and noticed some knock at low loads and ...

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    Knock at low loads

    Hi, it was a brisk day today and I did some logs and noticed some knock at low loads and no boost. I know this is generally accepted but was kind of consistent. Just wanted someone to take and look and see what might be causing and if its an issue of concern. These are just random driving events, not 3rd gear pull. Thanks
    https://docs.google.com/file/d/0B5GF...it?usp=sharing
    https://docs.google.com/file/d/0B5GF...it?usp=sharing

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    Moderator Donkey's Avatar
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    Need to know mods and octane of gas used.
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    Invidia catted tbe
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    Cali 91 octane
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  5. #4
    Moderator Donkey's Avatar
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    I would try cleaning the MAF and have a look under the car at the exhaust and make sure none of the hangers are broke. Sometimes if the exhaust bangs against something the knock sensor can actually pick it up.
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    I will take a look thanks, and what about cleaning the maf? If it was per say dirty wouldn't it throw it off all the time?

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    Quote Originally Posted by Gator0302 View Post
    If it was per say dirty wouldn't it throw it off all the time?
    Unfortunately no. Also gasoline quality can also effect it.
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    Granted in Cali we can only get 91, I only use chevron or shell. All that aside though running at at a non consistent -1.05 knock is acceptable? I say non consistent because it doesn't do it all the time. Just ran another log today and no issue.

  9. #8
    Moderator Donkey's Avatar
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    All cars knock to some degree. Thats the whole purpose of having active timing. -1 correction is not a big deal. Send the logs to your tuner.
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    Thanks for the input.

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