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not knockin now...wtf?

This is a discussion on not knockin now...wtf? within the Internal Engine forums, part of the LSx Technical Help Section category; a few weeks ago, i took my car to my dads house to begin the engine removal because it sounded ...

  1. #1
    its short but its skinny. jiveass's Avatar
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    not knockin now...wtf?

    a few weeks ago, i took my car to my dads house to begin the engine removal because it sounded like a bearing was knocking. I unhooked a few things including the coolant hoses and throttle cable and such. I called my dad last week and told him i would just come get the car when i move so i can remove the engine at my new house. So he actually put everything back together for me, except for adding coolant. I go there sunday, and start it up just for grins, and now its not knocking. I warmed it up a bit, but not to normal operating temp. Could it be that my oil just hadnt thinned enough to start knocking? or could the water pump have been the culprit and since there is no coolant in it, the water pump quieted down? The water pump doesnt have more than 5k miles on it. Also i noticed that it idles at around 1100rpm now instead of the usual 700-800. Thoughts?

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    Member importhater81's Avatar
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    Might be that the knocking you heard before was just common piston slap.Most Ls1's have it to some degree and it is normal. Ambient air temp when the car is started cold also plays a factor as to whether or not you hear it.

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    its short but its skinny. jiveass's Avatar
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    ive always had the piston slap......but this knock was different....

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    Member importhater81's Avatar
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    Drive it.See if the knock comes back. Rod knocks and lower end problems don't just go away.

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    O U 8 1 2 Spaz's Avatar
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    have you checked the oil level???

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    Member jetaws6's Avatar
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    Whats done to your car? It could be a noisy valve train if your oil is to thin. Run a ticker weight.

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    its short but its skinny. jiveass's Avatar
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    i just changed the oil before i started working on it...the level is full. im runnin valvoline 10w40.......im goin out this weekend to mess around with it..maybe take it for a
    zero-6-niner around the neighborhood and see if the knock returns.

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    its short but its skinny. jiveass's Avatar
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    Quote Originally Posted by jetaws6 View Post
    Whats done to your car? It could be a noisy valve train if your oil is to thin. Run a ticker weight.
    nothin really except longtubes and emissions delete.

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by jiveass View Post
    nothin really except longtubes and emissions delete.
    i wonder if you don't have a small exhaust leak... once the metal gets warm and expands it might come back and set off the SES... i'd let it warm up a bit and check...

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    its short but its skinny. jiveass's Avatar
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    ses remains on since i dont have any emissions hooked up.....

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    Member jetaws6's Avatar
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    Yea warm it up and see if it comes back. It might just have been your imagination. If it comes back though check all your rocker arms before you take the whole motor apart. The high idle may be a vacuum leak too.

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