Another possibility is that as the engine is overheating the heads are
coming loose and losing compression. Rare for this to get so bad to prevent
the engine from starting. Do you have what sounds like exhaust leaks but you
can't find any? How about chirps or whistles from the head to cylinder
gaskets?

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Gary Meier
Sent: Thursday, May 17, 2012 7:55 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Questions/Advice Needed 1980 VW Westphalia

I'm having an intermittent problem with the above vehicle quitting while
driving. Initially this was mainly when the engine had been working hard;
i.e. prolonged climb at the low end of the RPM range. Now it's beginning to
happen more frequently and under a variety of conditions. When it stops if
you let it set for 10-15 minutes it restarts and drives fine for an
undetermined period of time (now getting shorter). I've replaced the fuel
pump, fuel filter and most of the hoses on the fuel and intake system. Any
suggestions on where to look will be greatly appreciated.

I've also found that the auxiliarry air regulator is not full closing when
it's warm. VW says that this part is no longer available. Any suggestions on
how to by-pass this part or other work-arounds.