knocking sound?

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Nov 2, 2004 | 03:30 PM

nico

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From: el cajon, california

knocking sound?

my 1998 pontiac bonneville has a loud knocking sound when i turn it on in the morning and after it gets warmed up it goes away and the check engine light turns on? what can this be?

Nov 2, 2004 | 04:56 PM

beckstyle

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From: Grand Haven, Michigan

Where'* the noise coming from. Only when you idle, or all the time? A little more info could help out a little.

Nov 2, 2004 | 04:59 PM

Ryan

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From: Reutlingen, Baden-Wurttemburg, Germany

Also how fast/loud of a knocking is it?

Nov 2, 2004 | 06:09 PM

nico

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From: el cajon, california

only when its idle in the morning when first started. the knocking sound is pretty fast sounds like metal hitting against something. it sounds by the upper intake manifold.