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knocking when first started (ls-1)

This is a discussion on knocking when first started (ls-1) within the Internal Engine forums, part of the LSx Technical Help Section category; Hi, I have a 98 z-28 that I just bought 2 months ago. When I first start the car for ...

  1. #1
    I lika da Chevy's LETHALxLS1's Avatar
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    BLACK
    Z/28 LS1

    knocking when first started (ls-1)

    Hi,
    I have a 98 z-28 that I just bought 2 months ago. When I first start the car for the first time of the day it makes a knocking/tapping sound for about a minute. After that the noise goes away. I can start the car immediately or 3-4 hours later and the noise does not occure at all. If I let the car sit for about 6-7 hours it will make the same noise again for about a minute. Does anyone know what this could be ???? Thank you very much any help is greatly appreciated.

  2. #2
    a lil slap n pickle SSee ya's Avatar
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    how many miles on it?

  3. #3
    nc98z
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    piston slap which is a normal condition for an LS1.

  4. #4
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    Quote Originally Posted by nc98z View Post
    piston slap which is a normal condition for an LS1.
    dont worry about it! its normal
    mods- suncoast creations hood with functional lt1 style airbox, ls6 intake, QTP longtube headers, QTP ORY, UMI SFC, Adj. LCA with relo brackets, UMI adj. panhard bar, Koni SA and strano springs,Torq Thrust M 17s 9.5 and 10.5 with nitto 555Rs, tuned by Frost
    Quote Originally Posted by Modulistic View Post
    sometimes you get owned, sometimes you own.

  5. #5
    Junior Member turbotko's Avatar
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    Slappy slappy. It's a bit unnerving to hear your LS1 make this noise but it is normal.

    I'd trash GM for building these engines that are prone to piston slap........but it's such a damn good engine and I can deal with the sowing machine under my hood!

  6. #6
    I lika da Chevy's LETHALxLS1's Avatar
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    it has 65,000 miles and has made the noise ever since I bought it.

  7. #7
    I lika da Chevy's LETHALxLS1's Avatar
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    Thank you guys it damn sure had my nerves shot.
    I never heard anything like this in my previous camaros.
    But then again I never had above a 87 model iroc before
    this 98 I just got!!!

  8. #8
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    black
    02 z28

    if your ls1 doesn't sound like a sewing machine/ticking beast than it isn't an ls1

  9. #9
    King 0f n00bz shady milkman's Avatar
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    GM fixed that damn slaping in the ls2..i moved to a floating pin in the design..i believe you can swap em' out and eliminate it...but yea ls1 slap more then ike did to tina turner..and thats alot

  10. #10
    I lika da Chevy's LETHALxLS1's Avatar
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    hahahahahahah Ike and Tina thats funny man!!!!
    Thanks for the help!

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