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Whats this noise?

This is a discussion on Whats this noise? within the Internal Engine forums, part of the LSx Technical Help Section category; Ive heard this noise on both of my LS1 cars. I know its not piston slap, ive heard that before. ...

  1. #1
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    Whats this noise?

    Ive heard this noise on both of my LS1 cars. I know its not piston slap, ive heard that before. I kinda sounds like something inside the motor is lose. Its a rattling sound, and is louder when the motor is cold. On my first car i just figured it was because of the miles, but the one i have now only has 20,000 on it. Anyone one know what this is and if its normal?

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    My 2001 LS1 with 57K miles on it has a slight chattering noise when its cold but you have to either have the hood open or under the car with the engine running. My buddys 2002 T/A has the same sound. Are oil pressures and water temps good? I would not worry much about it.

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    Ya all the temps and pressure is good. My trans am only did when cold like yours. But this car does it even when its warm.

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    does it sound like some nuts and bolts rattling on some metal? because I have that sound....

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    Ya thats exactly what it sounds like actually. Today though a ran half a can of seafoam through the engine and the noise is completely gone. Along with other improvements to the way it runs. Good stuff

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