The throttle switch is only closed at idle or full throttle. So, sure, it
could be that, but it's not probable. A quick thing to try is unplug the
throttle switch, as per Bentley.

I agree with most everyone else, you have a fuel issue.

Replace the filter first, then try the other things (pressure, etc).

Jon

On Thu, 1 Mar 2007, mordo wrote:

> I am inclined to agree. It seems related to TPS to me but I figure I ought
> to go through the paces of checking all potential systems.
>
> On 3/1/07, Dave Vickery <davevickery@hotmail.com> wrote:
> >
> > I woudl say it has nothing to do with Vanagon Syndrome that is a very
> > specific situation caused by long periods of driving without moving the
> > throttle position.
> >
> > I doubt it has anything to do with AFM at all as it wouldn't get bad all
> > the
> > sudden.  Plus everyone suspects those and it never is.
> >
> > It's not going to be the 02 sensor either.
> >
> > I doubt loose grounds either for a sudden onset.
> >
> > Is the gas good?, near empty with water in it?  If it runs crappy when you
> > can work on it, you could try some spraying starting fluid into the intake
> > and see if it revs up fine.  That would narrow it down to a fuel
> > problem.  I
> > am definitely not the sharpest tool in this shed but maybe this will help
> > get some of the bigger brains to respond.
> >
> >
> > >From: mordo <helmut.blong@GMAIL.COM>
> > >Reply-To: mordo <helmut.blong@GMAIL.COM>
> > >To: vanagon@GERRY.VANAGON.COM
> > >Subject: Common problem, I think
> > >Date: Thu, 1 Mar 2007 17:33:49 -0500
> > >
> > >So, the trusty, uncomplaining engine that I feel grateful to have had for
> > >8k
> > >miles has suddenly developed a condition that I know has been described
> > and
> > >discussed ad nauseam here, I think. I would call it Vanagon syndrome but
> > it
> > >isn't really. Also, I have the OEM harness that is meant to cure
> > >"drivability issues." I have searched the archives, "the whole shebang"
> > on
> > >the BDTD site and also a cursory search through the Samba. I am left not
> > >knowing exactly what's happening.
> > >
> > >2.1l water cooled, automatic, 160k miles
> > >
> > >engine starts as normal but whether cold or warm, when one accelerates
> > and
> > >runs the RPM up to about 2500, it will go flat - loss of power. If I let
> > of
> > >the throttle, it will drop to a low, erratic idle of about 800 RPM. I can
> > >feather the revs til it smooths out at about 1700 rpm but it will not
> > >return
> > >to idle.This is, of course, sporadic but it has not disappeared long
> > enough
> > >to travel any great distance - maybe two blocks at a time without
> > failing.
> > >
> > >Perhaps recall that I had written about this engine and that when I come
> > to
> > >a stop, in gear, the idle holds high at about 1100 rpm. Tapping the pedal
> > >will let it drop to a consistent idle of about 950-1000 rpm.
> > >
> > >So, I'm thinking AFM or TPS mostly because of the high idle condition
> > when
> > >the engine was operating well. But, does the TPS usually cause the loss
> > of
> > >power (basically going flat) at higher RPMs?
> > >
> > >The engine was running perfectly on Sunday for a 160 mile jaunt back from
> > >the Northern Neck of Virginia. This condition appeared Wednesday morning
> > as
> > >wife tried to go to work in the van. I reckon I should check the
> > following,
> > >in this order:
> > >
> > >
> > >   1. disconnect oygen sensor
> > >   2. disconnect idle stabilizer valve
> > >   3. connections at injectors
> > >   4. loose grounds
> > >   5. TPS
> > >   6. AFM track and wiper
> > >
> > >Can anyone suggest a more direct troubleshooting path? Am I confusing
> > >symptoms by imagining the condition akin to the "syndrome"?
> > >Cheers,
> > >--
> > >mordo
> > >1990 Carat
> >
> > _________________________________________________________________
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> > FREE.
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> >
>
>
>
> --
> mordo
> 1990 Carat
>