I have this same type of problem on my US spec '92
Turbo also. Although I have yet to get any type of
boost controller... I will have good boost (factory
8.7) for a period of time... and then out of the blue
usually when I am driving it will drop to around 6 psi
for who knows how long (it has ranged from 2 hours to
two weeks). Since you don't use the boost solenoid I
am assuming that my problem is not the factory
solenoid either. Perhaps the wastegate is failing? My
knowledge of turbocharged cars ends at the theroy of
turbocharging. If anybody has any other ideas please
let me know. It's no fun driving at 6 psi.
Jay Erlenbach
'92 Legacy Turbo US Spec.
--- Ricky <
prostho@netscape.net> wrote:
> Yup.. similar problem. but i totaled the car before
> i could find out
> what the problem was... If it was running fine
> before, and u were
> running the MBC, i think the factory boost solenoid
> failing would
> have nothing to do with the boost settings, so i
> guess it must be
> your MBC malfunctioning or some vaccum line must
> have came off... or
> maybe there is a leak in the system somewhere.. good
> luck on finding
> the problem..
>
> i lived with the lost boost for a few weeeks and i
> got around 10%
> better fuel economy..
>
> --- In BC-BFLegacyWorks@y..., "Dave C"
> <legacycentral@y...> wrote:
> > When we were installing my AVC-R, we turned off
> all boost control
> to
> > see what the wastegate would open up at without
> boost control.
> > Somewhere between 6 and 7 PSI. This has held true
> on three EJ22ts
> i
> > know of. Ricky had a similar problem with his.
> >
> > It would be hard for an MBC to fail, indeed. Try
> hooking the old
> > factory one up and see what happens. My factory
> one is just capped
> > off on all 3 fittings.
> >
> > Dave
> >
> > --- In BC-BFLegacyWorks@y..., "PJHARJ"
> <pjharj@s...> wrote:
> > > > From: "Dave C" <legacycentral@y...>
> > > >
> > > >
> > > >6-7PSI is what the wastegate spring will open
> at.
> > >
> > > Do you mean if there is no signal at the
> wastegate diaphragm it
> > will open at
> > > 6-7 PSI on it's own?
> > >
> > > > Did you disconnect all but the wiring from the
> factory solenoid?
> > >
> > > The only connection I have to the factory
> solenoid is at the very
> > bottom,
> > > the hose that runs to the air-box is still
> connected and yes, the
> > wiring is
> > > still connected to keep the CE light off.
> > >
> > > >
> > > >It sounds like the MBC isn't working or might
> be installed
> > > >incorrectly.
> > >
> > > I suppose it could have failed, but it such a
> simple device -
> check
> > ball and
> > > spring ( I pulled it apart and all is clean and
> free). Perhaps I
> > lost some
> > > spring tension? It has been installed on the
> car for over six
> > months
> > > without problems..........
> > > How often does the wastegate solenoid fail I
> wonder? I will check
> > it.
> > >
> > > >The only way for the ECU to control boost is
> via the
> > > >factory solenoid and the eventual fuel cut at
> ~13PSI.
> > >
> > > Yep, that's what I thought.
> > >
> > > Thanks for the help Dave!
> > >
> > > PeteH
>
>
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