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Thread: hissing noise

  1. #1
    Regular Member johnm's Avatar
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    Default hissing noise

    recently bought vec 2.2 dti sxi, accept my apologies if this thread as been posted earlier. this being my first diesel in 24 years of driving, i,ve noticed an hissing noise when i change gear, basically is this normal, my 18 year old son (new ford fiesta ha ha, 0 to 60 in 3 weeks ) know all, told me its the dump valve, if on this occasion, he turns out to be right, perhaps i,ll forget to tell him.

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    Regular Member lofty's Avatar
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    I think that's right, either that or you have a snake in the car

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    Regular Member AndrewTi's Avatar
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    He's not too far wrong, it's from the wastegate of the turbo and perfectly normal. It's the built up air in the turbo being released to atmosphere when the throttle is closed. It prevents the turbo from kind of clogging itself with air and not responding.

    Little bit like a dump valve, but not quite!

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    Regular Member johnm's Avatar
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    thanks, my son need not know

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    Regular Member AndrewTi's Avatar
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    Quote Originally Posted by johnm View Post
    thanks, my son need not know
    Absolutely!!

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