Fw: bucking above 1.1 bar, max boost 1.3

[Claus Vegener]

----- Original Message -----
From: "Claus Vegener" <vegener at post7.tele.dk>
To: "Chris Covington" <malth at umich.edu>
Sent: Monday, February 25, 2002 3:55 PM
Subject: Re: bucking above 1.1 bar, max boost 1.3


If the problem is the ECU - reset the ECU by removing
the fuse. Had a overboost myselves with a IA chip.
(2.5 Bar > 5000 rpm)
When the situation was hit, it had to be reset for "normal" driving.
I have had a difficult to find leak - under the wormgear to
the short rubberconnection / T from IC tube to throttle.
After running NOS (-80 deg.C) the rubber cracked.
Try finding leaks with an aircompressor. Reservoir
big enough, so it wont start all the time.
A lot of connections have to be capped off -  but that
the way to do it - and use a thin hose from your ear to
listen.
Claus
----- Original Message -----
From: "Chris Covington" <malth at umich.edu>
To: "Kneale Brownson" <knotnook at traverse.com>
Cc: <200q20v at audifans.com>
Sent: Monday, February 25, 2002 3:15 PM
Subject: Re: bucking above 1.1 bar, max boost 1.3


> Kneale, et al,
>
> My fuel pump was replaced about 10K miles ago.
>
> Chris
> '91 200q20v
>
> On Mon, 25 Feb 2002, Kneale Brownson wrote:
>
> > My bet's on the fuel pump.
> >
> >
> > At 10:42 PM 02/24/2002 -0500, Chris Covington wrote:
> >
> > >I took a nice trip this weekend to Burlington, VT to visit a friend and
> > >give the 200 a nice 200 mile each-way trip.  No problems on the way there,
> > >in fact I even got 23.8MPG.  On the way back, merging/passing a Volvo
> > >after the I87 onramp in 3rd gear, at around 5K RPMs at WOT the 200
> > >seriously bucked and I let off the throttle.  The engine ran fine as long
> > >as it didn't get over 1.0 bar, without any missing / roughness, then it
> > >would buck really hard as if it were backing off or intentionally
> > >preventing high boost.  I let off boost for awhile then I then pulled over
> > >to get gas and check the intercooler hoses, and everything seemed fine.
> > >After the fill-up on 87 the 200 seemed normal again - I still got 1.7-1.8
> > >but I didn't push it too hard because I was more concerned with getting
> > >back.
> > >
> > >When I got home I tested it again and basically now get serious bucking
> > >in any gear starting when boost gets over 1.0 bar, with 1.3 being the
> > >highest I can get.  I thought it might've been the WOT switch because it
> > >seemed to only do it at full throttle, but under further examination it
> > >will buck at 3/4 throttle too, or in any other situation in which it goes
> > >above 1.0 bar.  So it seems to be a boost issue (or the witholding of) of
> > >some kind.  All my hoses are either new / in good shape.
> > >Is this the WGFV?  Something else?
> >
>
> _______________________________________________
> 200q20v mailing list
> 200q20v at audifans.com
> http://www.audifans.com/mailman/listinfo/200q20v