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Thread: Cavalier 2001 2.4l LD9 - Lots of KR

  1. #1
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    Cavalier 2001 2.4l LD9 - Lots of KR

    I'm having what I think is the phantom knock problem with the LD9.

    I did many drive of 1 hour cruising at highway speed while logging and have lots of KR all over the place... I did take a few time between 3* and 5* and it made not much difference.

    I read once that there might be a way to lower the knock sensor sensitivity... Do one of you would know something about this?

    Any help is appreciated.
    Last edited by GTP@2727; 03-21-2013 at 07:29 AM.

  2. #2
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    File and Log?

    These are bad for #3 Bearing going out.

  3. #3
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    here you go... they are from last spring as I parked the car during the summer not having much time to spend on it...
    Attached Files Attached Files

  4. #4
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    1. List Mods
    2. Get a wideband
    3. Start with VE Tuning
    4. Copy High Spark to Low Spark Table(even Alc tables) When Tuning Spark make changes to all tables.
    5. Have a Read Here http://www.hptuners.com/forum/showpo...9&postcount=21

  5. #5
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    1. Cold Air Intake (AEM brand) and MagnaFlow CatBack exhaust...
    2. I have the DynoJet wide band but I haven't installed it on the car. but will do for sure.

    Have you seen similar KR problem before when tuning?

    I appreciate your help and will definitely look at VE tuning. Should I consentrate on VE and once done move on to Spark tuning? or should I try do both at the same time?

    I'm planning to do off-road track racing with this car.

    thanks

  6. #6
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    get the WB in, and then read that link and start with VE.

  7. #7
    I ran into a similar prob. with another j-body....different motor, but same symptoms.

    As an experiment, set your timing to something ridiculously low, that would have absolutely no chance of causing legitimate knock retard....eg. 5-6 deg. I'm guessing it makes absolutely no improvement to the kr you're seeing. It appears from your log that the kr the car is seeing happens in direct relation to putting a load on the powertrain. Each time the tps goes up, kr goes up. If altering the timing as I suggested above doesn't get rid of the issue (& I don't think it will), go over the car looking for bad motor mounts etc.

  8. #8
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    This is very interesting Shane.... you got it right as the KR occurs under load. As soon as I take take my car out I will try with your suggested timing... until then I will spend some time to look at the motor mounts.

    thanks for the info!

  9. #9
    The LD9 likes to have ghost knock.

    Lowering the knock sensor sensitivity will help.

  10. #10
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    how can I do this?

  11. #11
    Quote Originally Posted by GTP@2727 View Post
    how can I do this?

    Go to the Spark Tab, then Retard, Then Base Retard table, lower that number. Maybe 10-20%