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Vacuum leak??

Skimanz

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Skimanz New Member

Skimanz

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I have a 2003 Sierra 5.3 2wd, no check engine lite, no codes, but on freeway, I have an annoying whistling sound like a vacuum leak.  I can't find it anywhere.  Do you have any suggestions??

carnau Enthusiast

carnau

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1 hour ago, Skimanz said:

I have a 2003 Sierra 5.3 2wd, no check engine lite, no codes, but on freeway, I have an annoying whistling sound like a vacuum leak.  I can't find it anywhere.  Do you have any suggestions??

Where does it sound like it is coming from? Is it speed only or can you get it to make the noise while you're sitting still and throttle up?

Skimanz New Member

Skimanz

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Under speed only.  I cannot duplicate it sitting still.  So it does the pretend-turbo whine when it is under slight load, going 65+mph on freeway.

 

It sounds like off the intake manifold or power brake booster, somewhere around the front left, I believe.

 

carnau Enthusiast

carnau

Posted
Posted
5 hours ago, davester said:

Are you sure it's not wind related?  Like a door seal failing or window slightly cracked?

This what I am thinking. Get some painters tape and start taping openings

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