Re: Fw: HELP!!! Low boost 200tq

[Orin Eman <orin@wolfenet.com>]

Immediate candidate is the multi-function 'switch', actually a combined
temperature sensor/switch.  If not that, perhaps the wastegate frequency
valve.  Take a good look at Scott Mockry's writeup on low boost conditions:

http://www.sjmautotechnik.com/boost.html

Orin.

> >I waited a long time to ask the list on this...
> >
> >I have a 1989.5 200tq with the dual knock MC.  When I bought the car just
> >under a year ago, I saw the magic 1.4 bar number all the time.  After a few
> >months of use, that number dissapeared forever on the boost gauge and has
> >yet to be seen again.  In fact, my max bar of boost now is only 1.2!
> >
> >It's been this way for a few months now.  I have recently spent some
> serious
> >time trying to chase down this low boost problem and have yet to find the
> >culprit.  I have checked all vaccuum lines, pulled off the TB to IC hose
> and
> >checked it carefully, I had new injectors & seals installed about 6 months
> >ago so it can't be leaking from there.  New fuel pump, new fuel fliter,
> >mixture seems fine and hasn't been messed with.  yesterday I pulled the
> >codes and I got the "4444"!  That's right, everything is fine there.  And,
> >today, as a last straw, I replaced my WOT switch (even though the old one
> >tested fine) as I thought it might make a difference.  It didn't!
> >
> >I am at a loss here folks.  Any direction or advice on where to look for
> >this loss of boost power would be appreciated.  Otherwise, the car still
> >runs great, idles smooth, and pulls strong all the way up to it's 6500 rpm
> >redline.
> >
> >Any advice on what might be causing my low boost condition would be greatly
> >appreciated!
> >
> >BTW, I talked to my mechanic the other day and he told me he thought the WG
> >spring might have gotten weaker and might be opening up prematurely and
> >bleeding off too much boost.  He said he sees it all the time on 930 turbos
> >and other Porsches.  Is this something that plagued Audis as well???
> >
> >Later,
> >Dan
> >
> >
> >
> >