Hissing on overrun/engine braking

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November 5, 201411 yr

Hi All!

I've been having a hissing noise on overrun as the revs drop down. This Only occurs between 2500 and 2000rpm. It will go on for as long as you are off the throttle, and in between those revs.

It even happens when in neutral and the engine is revved above 2500 and your foot taken off the accelerator.

Does anyone else have a similar noise?

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UK TT Manual Project

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By cybernet · Yesterday at 00:001 day
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Hello, I have a 1996 twin turbo manual with 64k miles. I recently started having the check engine light come on sometimes and other times it doesn't. When I checked the codes these are what I got : If anyone has had these same codes what did they change to fix the problem. Car runs fine with check engine light on but want to fix issue. Any help would be greatly appreciated. Thank you.
P0400
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By JB300ZXTT · Monday at 22:143 days

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Hissing on overrun/engine braking

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