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pressure release sound from engine bay when engine is stopped

Discussion in 'New A3/S3 (8V Chassis)' started by karlabdool, Dec 24, 2013.

  1. karlabdool
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    karlabdool Member

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    [Dec 24, 2013]
    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?
    #1
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  3. driver_tim
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    driver_tim Active Member

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    [Dec 25, 2013]
    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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  4. karlabdool
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    karlabdool Member

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    [Dec 25, 2013]
    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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  5. karlabdool
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    karlabdool Member

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    [Dec 25, 2013]
    Lower left as in passenger side
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  6. Dan_G
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    Dan_G Active Member

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    [Dec 25, 2013]
    Air con compressor.
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  7. karlabdool
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    karlabdool Member

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    [Dec 26, 2013]
    Could very well be a/c, btw how much kms have you done so far Tim?
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  8. driver_tim
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    driver_tim Active Member

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    [Dec 27, 2013]
    3100ish, not had much chance to use the car since I got it at the beginning of September unfortunately.
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  9. karlabdool
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    karlabdool Member

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    [Dec 31, 2013]
    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)
    #8

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