2004 Mustang GT Mild idle Flutter

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08-31-2010, 11:10 AM

#11

Power Juicer

Thread Starter

Join Date: Jul 2010

Location: TN

Posts: 14

Quote:

Originally Posted by cliffyk

Wait--at 4500 miles (which have been useful info in the first) it is highly unlikely that the IAC has worn enough to be causing the noise.

Are you 100% sure that what you are hearing is not just plain ol' intake noise?

Also, by "...idle will flutter after it has warmed..." do you mean that the idle is a tiny bit "lumpy"-if so then there's nothing wrong these engines can have a slight "rolling/uneven" idle, mine has been that way since I got it with 30k miles.

Yes, thats what its doing.
The intake noise is just uneven. You can see a small dip in the rpm gauge

08-31-2010, 11:42 AM

#12

cliffyk

TECH SAVANT

Join Date: Dec 2006

Location: Saint Augustine, FL

Posts: 10,938

Quote:

Originally Posted by Power Juicer

Yes, thats what its doing.
The intake noise is just uneven. You can see a small dip in the rpm gauge

If it is just a tiny bit then it's normal for these engines, part of the PI (Performance Improvement) changes to the 4.6L 2V introduced in 1999 was higher lift and more aggressive cams--they can be a little bit "lumpy" at idle.