LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

What are all the possible causes of false knock?

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Old Sep 4, 2003 | 08:58 PM
  #1  
ltlhomer's Avatar
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From: Metro Detroit, MI
What are all the possible causes of false knock?

List anything you have experienced. I'm getting rid of it this weekend if it's the last thing I ever do . Thanks guys...
Old Sep 5, 2003 | 12:39 AM
  #2  
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Cool

Noisy lifters?Nobody chimed in,so I thought I'd lend a hand.
Old Sep 5, 2003 | 01:00 AM
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Exhaust rattle.
Old Sep 5, 2003 | 01:10 AM
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The addition of headers has been known to cause it in some cases.
Old Sep 5, 2003 | 01:14 AM
  #5  
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Cool

Also some after market underdrive pulleys will make a resonance(spelling check),and make a noise as to create a false knock.(read this somewhere).My02
Old Sep 5, 2003 | 07:46 AM
  #6  
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Thanks for the guesses....

FWIW, my car had zero knock when I scanned it at the beginning of the season. That is with the same setup so I'm thinking it can't be the exhaust. The rr's perhaps because they can come loose...noise lifters, I sure hope not because I don't feel like dealing with that.

Any other ideas? Thanks again guys...
Old Sep 5, 2003 | 09:16 AM
  #7  
'94 Bad A Z28's Avatar
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Stuff some tissue around the sensor, lol... That'll take care of that problem!




I'm just kidding, it'll work, but do it at your own risk.
Old Sep 5, 2003 | 10:11 AM
  #8  
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I dunno...I'm adjusting my rr's then throwing some unleaded sunoco 104 in there. If the knock persists, then I'll have to explore other possibilities since I'll know for certain it's false knock.
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