1999 S80 hissing noise when pressing gas pedal

1999 Volvo S80

There is a hissing noise when I press the gas pedal. It gets quieter when I don't, louder when I press harder. It also gets louder the longer I drive. Sounds like a soft hiss, and then turns out into something like scratching of sand on glass.

Anyone has an idea what it could be? It's not there when the engine is cold, so the service guys didn't hear it (they didn't test-drive it long enough).

I'd really appreciate the help.

Last post for today. Merry Christmas everyone and goodnight.

you might want to check for turbo or vacume leaks...
hissing might be the air by passing through a hole
or leake...has miles per gallon changed?

On Dec 24, 10:25 pm, kompir wrote:
> 1999 Volvo S80
>
> There is a hissing noise when I press the gas pedal. It gets quieter
> when I don't, louder when I press harder. It also gets louder the
> longer I drive. Sounds like a soft hiss, and then turns out into
> something like scratching of sand on glass.
>
> Anyone has an idea what it could be? It's not there when the engine is
> cold, so the service guys didn't hear it (they didn't test-drive it
> long enough).
>
> I'd really appreciate the help.
>
> Last post for today. Merry Christmas everyone and goodnight.
>
> --
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