hitting fuel cutoff after installing QLCC (cont.)

[Noah]

OK, now I am in a bit deeper... I think the diaphragm got torn somehow. The
diaphragm was all rotten and melted to the little cup that presses against
it. I am going to order another diaphragm and see what that does. (SJM is
out of town till the 13th, anyone know of another good diaphragm source?)

My problem now is that I have attempted to remove the lower spring perch nut
and the whole shaft is spinning. I have been holding the cup with a pair of
pliers and still the shaft spins. Is there a way to remove the top part of
the WG without taking it apart from the two flanges? I apparently need to
get ahold of the other end of the bolt. I notice that there are three small
nuts that seem to hold the top part onto the accordian-looking piece. If I
remove these can I separate the WG and get at that bolt?

-Noah
'87 5kcstq w/ very high boost



----- Original Message -----
From: "Noah" <noahgodwin at earthlink.net>
To: <Eric_R_Kissell at whirlpool.com>; "Robert Myers" <robert at s-cars.org>
Cc: "Audifans Q-list" <quattro at audifans.com>
Sent: Wednesday, September 24, 2003 9:57 AM
Subject: Re: hitting fuel cutoff after installing QLCC


> Text inserted between replies...
>
> > At 08:04 AM 9/24/2003, Eric and Robert wrote:
> >
> > >Did your car have any other boost modifications prior to installing the
> > >qlcc chip?  If it had the zenor diode modification, you should remove
> > >that.
> >
> > Yes, if present it should probably be removed but the function of the
> > zener/resistor mod is to prevent the chip from shutting off the fuel
pump
> > when boost is elevated.  This can't be the source of the problem.  It
> might
> > be the source of other problems but not this one.
>
> The car was completely stock before the "transformation". In fact I could
> not get more than 1.3-1.4 bar to appear on the gauge. This was pre-boost
> gauge though, so it may have been up to factory specs. One thing I have
> learned is that the digital gauge is VERY slow to respond. It even seems
> like the fuel cutoff is pretty slow to respond also, since it's getting
it's
> signal from the same source as the gauge.
>
>
> > >The chip is doing its job in cutting off at 1.95 bar.  That is a
> > >designed-in safety feature to keep from destroying anything.
> > >
> > >It sounds like your wastegate is not opening.
> >
> > That is a possibility.  A torn wastegate diaphragm can cause overboost.
> >
> >
>
> I'm thinking that I would have noticed the diaphragm tearing if I did it
> while changing the spring, and I know it was fine before I started.
>
> > >Are your hoses to the wastegate OK? Check the lower hose to the
> wastegate.
> > >Is it attached?  Any cracks?
> > >
> > >Your spring may be too stiff.  Is your wastgate cap adjustable? If it
is,
> > >back it off until the problem goes away.
> >
>
> I checked the lower WG hose yesterday and found it to be fine.
> Before this procedure I had no overboost problems so I'm guessing it
mostly
> has to do with the spring pressure. I am going to try to find the old
stock
> spring today and see if reinstalling that stops the overboost.
> Maybe I'll make my WG adjustable and try it that way too. I like the
> characteristics of the heavy spring but obviously I can't deal with the
max
> boost it provides. Maybe the heavy spring will be ok with less preload.
>
> Thanks for the help guys =)
>
> -Noah
>