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Horrible whistling noise coming from behind upper plenum, I think.

Tiny
TEXASSTANG
  • MEMBER
  • 2002 FORD MUSTANG
  • 4.6L
  • V8
  • RWD
  • MANUAL
  • 130,000 MILES
I have a 2002 Mustang GT and it is making an extremely loud high pitched noise noise near the intake manifold. I am throwing the following codes P1506, P0171, P0174, P0316, P0307, and sometimes P0303 comes and goes. I thought it was the IAC valve so I replaced it but nothing. Then I checked the vacuum lines and added some hose clamps where needed and teflon tape where needed, and still nothing. Lastly, I sprayed WD-40 around the vacuum lines to see if there was a change in rpms but nothing again. Please someone help me. I can post a video of the noise if it helps.
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Saturday, December 19th, 2015 AT 2:59 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You have a bad vacuum leak that you are going to have to pinpoint. It's usually one of the large rubber connectors connected to the manifold. They suck a hole inward when the engine is running and that hole closes when the engine is shut off.
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Saturday, December 19th, 2015 AT 7:29 PM
Tiny
TEXASSTANG
  • MEMBER
  • 3 POSTS
https://www.youtube.com/watch?v=-EuFK-P5kz4&feature=youtu.be
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Monday, December 21st, 2015 AT 4:07 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
If you can't find it visually you will have to do a smoke test on the intake.
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Monday, December 21st, 2015 AT 4:24 PM

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