[urq] RE : RE : What causes knock ?

Louis-Alain Richard laraa at sympatico.ca
Fri May 12 14:37:40 EDT 2006

Yeah, you're right: the wastegate spring (+ boost pressure) is the only
thing that controls actual boost. I checked it a while ago, but it may
have failed now. IS it possible to test it with a MightyVac ? IIRC, I
wasn’t able to... 


> -----Message d'origine-----
> ... if your car is stock you should not see readings this high ... and
> that very well could be contributing to the knock.  The ECU would
> have shut off the fuel pump at this boost level.  Do you know if your
> diaphragm is cracked?
> Steve B
> San José, CA (USA)
> >
> > I my case, the story is similar has I've seen as much as 1.9Bar on
> > dash gauge, a figure I've never seen before. And the car feels
> > than ever, even with 3 guys + tools aboard heading for parts hunting
> > a scrapyard yesterday.
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