Making loud sound from valve cap broken

Asked by Apr 02, 2017 at 11:08 PM about the 2006 Volkswagen Jetta 2.5L

Question type: General

My car is making a loud whistle sound with a little
howling when I push down to go faster the noise
stop but soon I take my foot off noise starts back
started making noise day after oil change... 2006
volkswagen jetta 2.5 when my car is in park my
tachometer goes in between 10 and 20 I'm not
even driving it doing while in park
..Making loud sound from valve cap broken

1 Answer

70,255

Sounds like a vacuum leak. Intake manifold vacuum is highest at idle. So the noise will be louder. The high idle speed is also a symptom of a vacuum leak. HTH. -Jim

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