pressure release sound from engine bay when engine is stopped

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karlabdool

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• Dec 24, 2013

• #1

hi all,
i have the fwd 1.8tfsi, 4700kms

does anyone hear a sort of hissing (pressure release) sound that pulses (hisss stop hiss stop etc.) when they switch off their engine when returning home from a trip with the car?? the sound only lasts a couple of seconds .

I am not sure if it is venting pressure from the turbo that might still be spinning slowly ( i do give a minute or 2 spool down time before i switch off)



i also noticed a very very mild oil stain on the plastic shield right below the oil fill cap. The cap seems to be spring loaded as well. I hope i do not have some kinda back pressure problem.
car doesnt seem to be burning any considerable amt of oil either.
Car drives fine tho.

any ideas?

 

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driver_tim

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• Dec 25, 2013

• #2

I have the same engine. Not noticed a hiss but will keep my ears open.

I also have a small oil stain near to the filler cap. I check the oil level regularly and it doesn't seem to be burning much if any. I put the stain down to the dealer topping up the oil during the PDI.

 

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karlabdool

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• Dec 25, 2013

• #3

Yea I think the oil was a bit overfilled and maybe some vapor came out when I did some red lining ? Who knows ? I read somewhere that the pulsing hissing could be a/c so I will have to drive without a/c and see. The hiss does seem to come from lower left area of engine bay

Thanks for your response Tim

 

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karlabdool

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• Dec 25, 2013

• #4

Lower left as in passenger side

 

Dan_G

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• Dec 25, 2013

• #5

Air con compressor.

 

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karlabdool

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• Dec 26, 2013

• #6

Could very well be a/c, btw how much kms have you done so far Tim?

 

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driver_tim

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• Dec 27, 2013

• #7

3100ish, not had much chance to use the car since I got it at the beginning of September unfortunately.

 

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karlabdool

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• Dec 31, 2013

• #8

Ok well it did lose some oil since last I checked. The level is a bit lower than half at the current mileage of 4700 kms . I'm monitoring it carefully and bought some top up oil incase it gets too low b4 5000 kms ( service)