Chris NottSky Insurance
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  1. #1
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    pressure release sound from engine bay when engine is stopped

    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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  3. #2
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    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.
    A3 8V 1.8T 6 speed 3 door S line - Daytona Grey. Interior lighting pack, privacy glass, comfort pack, electric folding heated dimming door mirrors, tyre pressure monitor, electric lumbar support, cruise control, acoustic parking system rear, B&O sound system.

  4. #3
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    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

  5. #4
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    Lower left as in passenger side

  6. #5
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    Air con compressor.

  7. #6
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    Could very well be a/c, btw how much kms have you done so far Tim?

  8. #7
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    3100ish, not had much chance to use the car since I got it at the beginning of September unfortunately.
    A3 8V 1.8T 6 speed 3 door S line - Daytona Grey. Interior lighting pack, privacy glass, comfort pack, electric folding heated dimming door mirrors, tyre pressure monitor, electric lumbar support, cruise control, acoustic parking system rear, B&O sound system.

  9. #8
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    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)

 

 

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