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  #1  
Old 01-31-2011, 06:58 PM
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5.4L Intake whistle when cold

Hey all.

In the 05, I get a whistle from the engine compartment at certain speed/rpm combinations. It only happens when the ambient temperature is cold.

Are there any particular parts or gaskets that give out with a minor leak? The thing just whistles... No idea where to start looking.

Ryan
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Old 01-31-2011, 07:09 PM
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If its running ok, dont worry about it. Engine coolant is a factor for IAC operation.
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Old 01-31-2011, 07:13 PM
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I didn't know what an IAC was until I googled it. Idle Air Control?

It does it even when the engine is warm, it only whistles when the ambient air is cold. It's running just fine though.

Ryan
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Old 01-31-2011, 07:18 PM
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Originally Posted by O'Rattlecan View Post
I didn't know what an IAC was until I googled it. Idle Air Control?

It does it even when the engine is warm, it only whistles when the ambient air is cold. It's running just fine though.

Ryan
Intake leaks can generate a whistle, but there would probably be driveability issues. You might spray carb cleaner around to locate any air leaks. Its probably internal though.
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Old 01-31-2011, 07:25 PM
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Thanks Vince. Maybe I'll pop off the Idle Air Control and see if it's got any gunk in it I can clean out.

Ryan
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Old 01-31-2011, 07:44 PM
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Originally Posted by O'Rattlecan View Post
Thanks Vince. Maybe I'll pop off the Idle Air Control and see if it's got any gunk in it I can clean out.

Ryan
Try that and a carb cleaner soaked rag on the butterfly and mating surfaces inside the throttle body. There isn't any tsbs related to the symptom.
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Old 01-31-2011, 07:55 PM
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Originally Posted by blacksnapon View Post
Try that and a carb cleaner soaked rag on the butterfly and mating surfaces inside the throttle body. There isn't any tsbs related to the symptom.
Cool. Will do. Thanks for the help Vince. I feel better about there not being a vacuum leak.

Ryan
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