[20v] Coupe Quattro 20V Carbon Fouling Plugs

Ben Swann benswann at verizon.net
Sat Sep 12 06:40:23 PDT 2009

Definately sounds like BrettD has the most likely culprit pinned down!

Brett Fairbanks - you need to install a new pressure regulator.  There are probably some
aftermarket adjustable units that will be better and cost less than stock.  Others may
chime in as I don't have much experience with these - Yet.


-----Original Message-----
From: Brett Dikeman [mailto:brett.dikeman at gmail.com] 
Sent: Friday, September 11, 2009 6:52 PM
To: Ben Swann
Cc: brettfairbanks at verizon.net; 20v at audifans.com; quattro at audifans.com
Subject: Re: Coupe Quattro 20V Carbon Fouling Plugs

On Fri, Sep 11, 2009 at 6:29 PM, Ben Swann <benswann at verizon.net> wrote:

> Basically what you are saying is what I meant sort of - somehow the 
> FPR fails and dumps too much fuel in.  I can certainly see how a seal 
> in the regulator fails or leaks in such a way as to dump fuel directly 
> into the head, particularly if the injector seal allow for fuel to 
> leak by or to pull fuel through the vacuum control port - which  now as I recall is
how I think the failures I mentioned earlier were occurring.

I think the giveaway is that fuel is pooling in the IM.  I can't think of how that could
possibly occur from a leaky injector, even if the Hitachi injectors are known to be
junk.  And it's definitely not normal.

I think the leaky FPR was an issue on V8's as well, causing some fuel hydrolock in some
cases, which is a definite bummer on that engine...

Other Brett: after you get this straightened out, I definitely recommend running some
Seafoam through to clean out the combustion chambers etc...


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