I got the impression it's a Haltec system with a MAP sensor ..
and may not even have an AFM.

I would go right to that low fuel pressure.
if someone drives a waterboxer engine with a full time fuel pressure gauge
on it..
and it's forever in the 32/34 range .
and then it gets to the 12-15 psi range..
I'd sure think that would be a good place to start !!

sometimes..
people will say ...yeah, I know it does that..but it ran ok before like that
..therefore that's not it ..
to which I say ..
especially if you don't find, or know, something  else to do ..
Fix what you know is not right !!!
for starters.
scott
turbovans

----- Original Message -----
From: "Karl Wolz" <wolzphoto@Q.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, July 25, 2011 2:12 PM
Subject: Re: Strange Catastrophic Failure

> The difference in compression is not good, but it would not cause the
> mentioned symptoms.  I've had some bad running issues when the
> (unclippped)
> AFM connection came loose.  Idled OK, but would not run with throttle
> application.  I'd also look at major vacuum loss, like the breather hose,
> or
> even the AFM boot.  Then the new O2 sensor or the coolant temp sensor.
>
> Look for obvious issues, check grounds, disconnect O2 and then coolant
> temp.
>
> Karl Wolz
>
>
>
> |-----Original Message-----
> |From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]
> |On Behalf Of Rob
> |Sent: Monday, July 25, 2011 10:58 AM
> |To: vanagon@GERRY.VANAGON.COM
> |Subject: Re: Strange Catastrophic Failure
> |
> |A 75 psi difference in compression pressures would bother me,
> |bother me a lot.
> |
> |Rob
> |becida@comcast.net
> |
> |At  7/25/2011 09:47 AM, Jake de Villiers wrote:
> |
> |
> |>Does it crank fairly evenly?  That low cylinder is a little
> |worrisome.
> |>If the lifter's had a spasm and is keeping one of the valves from
> |>closing fully...
> |>
> |>Good luck!
> |>
> |>On Mon, Jul 25, 2011 at 1:29 AM, Max Wellhouse
> |<dimwittedmoose@cfu.net>wrote:
> |>
> |> > Drove my 90 GL w/248k on the ODO(Boston Bob rebuild
> |at130k) to work
> |> > last week with no problems.  1 hours later when I try to
> |start it to
> |> > go home, it did start sorta, but wouldn't build up RPMs and was
> |> > running WAY rich.  Checked compression and had the following  1-165
> |> > 2- 135, 3 -95, and 4- 135.  Don't think that's the major problem,
> |> > though.
> |-----
> |No virus found in this message.
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> |07/25/11