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engine noise at high rpm

This is a discussion on engine noise at high rpm within the Internal Engine forums, part of the LSx Technical Help Section category; I need a little help. I have 98 Z28 6 speed. When I run the engine under full throttle into ...

  1. #1
    banditmotor
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    engine noise at high rpm

    I need a little help. I have 98 Z28 6 speed. When I run the engine under full throttle into the high rpms I get a knocking noise. It seems to come from the left side of the engine. The car also seems to lacking power. Occasionaly when I hold the throttle steady there seems to be a barely perceptable variance in the power.

    I replaced the waterpump about 20k miles ago.

    Any help would be appreciated.

    Sean

  2. #2
    member since may 2000 nhraformula's Avatar
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    black
    2000 nhra edition formula

    sounds like pinging, better known as knock retard.
    youre a/f ratio maybe off.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  3. #3
    banditmotor
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    how do i adjust my air/fuel mixture?

  4. #4
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
    00 Z28 sold :-(

    a tune......either on a dyno or canned

  5. #5
    Awaiting Activation Liquifire's Avatar
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    Quote Originally Posted by banditmotor
    I need a little help. I have 98 Z28 6 speed. When I run the engine under full throttle into the high rpms I get a knocking noise. It seems to come from the left side of the engine. The car also seems to lacking power. Occasionaly when I hold the throttle steady there seems to be a barely perceptable variance in the power.

    I replaced the waterpump about 20k miles ago.

    Any help would be appreciated.

    Sean
    I seriously doubt that the water pump has anything to do with it.......unless you are running at 300 degrees.........do you have any mod's done to the car or stock?

  6. #6
    banditmotor
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    There are no mods to the engine, borla exaust and K&N air filter are all that has been changed. I am beginning to think the noise may be coming from the clutch assembly. Possible damage to the clutch or fly wheel causing the noise. If anyone has an opinion, let me know.

    Thanks for all the help so far.

  7. #7
    Member keliente's Avatar
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    99 Firebird Formula

    Sounds like spark knock to me. High rpm's, lack of power, etc. Get it on a dyno and have a tuner work with you to achieve the correct air/fuel ratio. Or perhaps something mechanical could be causing the poor a/f ratio, such as oil consumption, etc.

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