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2007 Volkswagen Passat Whining noise in my 2.0 when I am in

Tiny
KKHUTCHERSON
  • MEMBER
  • 2007 VOLKSWAGEN PASSAT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 81,700 MILES
I have a whine in my engine that starts up after about 5 minutes of driving or when the car warms up. This is only happening when I am in idle or decelerating, but not when I accelerate or when I am in reverse. The car runs fine, but just a few days ago my check engine light came on, but this is not rare with this car. When I shut the engine off, the whine sounds like a whistle as it shuts off for a few seconds afterwards.
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Friday, October 1st, 2010 AT 10:13 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Get a can of spray gumout, start the car and spray around, pay attention to vacuum lines and manifold, if the idle changes, you found a leak. You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!

The other possibilty is the idle air control, it, s bolted to the side of the throttle body.
Also do not spray hot exhaust manifolds or pipes, it can cause a fire!
You also want to read the codes, it can point you to the problem, Autozone will read them for free, post codes here.
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Friday, October 1st, 2010 AT 11:31 AM

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