4.6L 4v Tech for the 4V Cobra motors and Mach 1

Rattling noise at high rpm's

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Old 11-11-2004, 06:12 PM
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Rattling noise at high rpm's

Hey guys...

Just recently I noticed when I am driving hard and reach high rpm's (speed doesn't matter) there is a rattling sound of some sort coming from my engine bay. Sounds like marbles in a can. I tend to think it is detonation and asked my shop teacher and he said the same thing. I am guessing to put in high octane fuel....any other advice?

Thanks
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Old 11-11-2004, 06:50 PM
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Originally Posted by DevilishCoupe
Hey guys...

Just recently I noticed when I am driving hard and reach high rpm's (speed doesn't matter) there is a rattling sound of some sort coming from my engine bay. Sounds like marbles in a can. I tend to think it is detonation and asked my shop teacher and he said the same thing. I am guessing to put in high octane fuel....any other advice?

Thanks
Sounds like piston slap
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Old 11-11-2004, 07:05 PM
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check your timing, you might be able to fix it that way, otherwise try higher octane and see if that helps.
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