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Author Topic: Hissing from engine  (Read 1599 times)

Offline trizza

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Hissing from engine
« on: 17 July 2010, 08:13 »
Aafter various issues with my exhaust warning light coming on the garage changed the MAF sensor which seem to have cleared the fault.  However when you turrn the engine off a loud hiss comes from the engine bay sounding like it's leaking pressurised air.  I presume this is not normal?

Another issue is that when idling and in D, the engine sits at about 700rpm, but when you put it into N or P it increases to 1100rpm! Is this another fault? 

Am honestly starting to lose the will to live with this car...
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Offline Saint Steve

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Re: Hissing from engine
« Reply #1 on: 17 July 2010, 14:06 »
If its coming from under the engine top cover, the PCV valve may well have blown. If it has a lumpy tickover aswell, then replace that, cheap and easy to do.

Its a rubber diapragm that is a known weak spot on the engine breather circuit.

Mine done the same thing, hissing after shut down. Replaced the unit. £30 for the valve housing, done in 15 minutes
« Last Edit: 17 July 2010, 14:07 by Saint Steve »
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Offline No Golf Clubs at all

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Re: Hissing from engine
« Reply #2 on: 18 July 2010, 05:30 »
Do you still have the part number? Is it easy as a diy job?
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Offline jimmyGIT

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Re: Hissing from engine
« Reply #3 on: 22 July 2010, 21:44 »
Hope so ,Its a complete git on my 1.8t. :undecided:
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