C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Knock,knock

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Old Aug 7, 2004 | 10:06 AM
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From: Database Error Indiana
Default Knock,knock

Im getting knock counts/spark retard. Only when the tires are spinning. As soon as it hooks up the knocks stop. I can also rev the motor in park and induce knock counts. Just seems to knock under no load conditions. Any ideas out there?? Its an L98 A4 3.07 gears with some mods and a ski chip.
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Old Aug 7, 2004 | 10:35 AM
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Have you checked the harmonic damper or had some one listen up front as you rev the engine to see if knock or noise can be heard?
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Old Aug 7, 2004 | 10:44 AM
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Seems to be near #8 cyliinder but nobody can agree on exactly where. I would not expect a no-load knock. Also Ive tried timing/FP combos to no end. The pre cats are empty. Could the knock sensor be picking up vibes from them? The car is pretty loud.
Thanks

Last edited by JackDidley; Aug 7, 2004 at 10:49 AM.
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