Hey Martin, its way past time to stop checking values and start grabbing
parts.
It might be something difficult but its more likely water in the gas or
over-advanced timing.

Is the distributor tight in its hole or will it turn with hand pressure?

What happens when you wiggle the distributor harness wires while its idling?

Undo the fuel hose at the regulator and watch it while your wife turns on
the ignition.  Does gas blast out?

Change the filter and try it again.

Does it idle steady at ~900 RPM?

On Fri, May 23, 2008 at 5:14 AM, Chris S <szpejankowski@gmail.com> wrote:

> Backfire like that would indicate a lean condition, no?
>
> I'd go with a new fuel filter and check for fuel leaks especially ahead of
> the fuel pump where it could be sucking air.
>
> But I'd also make sure to check the total timing advance.
>
> Viel Gl�ck!
>
> On Thu, May 22, 2008 at 2:08 PM, Poppie Jagersand <
> poppie.jagersand@yahoo.ca>
> wrote:
>
> > Hi,
> >
> >  While driving the 1.9l wasserboxer first lost power and backfired on
> >  steep uphills, then shortly started loosing power at any time, until
> >  we had to creep off the highway on idle until the next exit.
> >
>

-- 
Jake
1984 Vanagon GL
1986 Westy Weekender "Dixie"
Crescent Beach, BC
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27