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Help please! Very bad noise when dumping.


RobEvans
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My cars started making a really bad noise and its getting worse...

 

Just wondering if anyone can help me before I take it a garage. It only makes it when i let off, like when the car dumps. Its like a really loud vibrating sound and you can feel it on the loud pedal, kind of like the gritty ABS feeling you feel on the brake pedal :(

 

It only does it when letting off harshly on roads but when I'm on the motorway its every time theres any boost over 0 bar.

 

Please tell me its not bad news :rolleyes:

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Hope its not serious...otherwise I'd be crass in saying that that is the best thread title I've seen yet.

 

Yeah, I read the title and thought "more fibre in your diet"...

 

Seriously, is this on engine braking then? You might be thinking it's something to do with boost, because after boosting, the slow down effect of engine braking is more noticeable, so it may be more of a drive train issue.

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Anyone got any ideas???

 

Iv tried my standard dump valve but it seems to be broken and constantly open.

 

the strange thing is when iv got foot to the floor 70+ then slowly let off, you can hear alittle bit of dump - weird buzzing voice - then the rest of the dump.

 

Iv also had a problem with it sticking and not dumping for a few min when the engines cold.

 

Its SARD by the way/

 

Thanks guys

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