Most likely you are having a problem with the O2 sensor or the wiring
to/from it. An easy way to test is to quickly cycle the ignition switch
while the engine is running. If the engine runs normal for 30-seconds or so
after this cycling then the problem is definitely related to the O2 sensor.

What is happening is that the ECU is not seeing the signal it wants so it
keeps richening the mixture. Without the proper feedback the mixture goes
rich enough to kill the engine. Bad ground connections, a shorted wire to
the sensor, etc are all reasons for this circuit to cause grief.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Finn Runyon
Sent: Monday, August 24, 2009 8:42 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Warm engine missing 87 Westy GL

Hey Everyone,

I have been off the list for a while as my 87 has been moth balled since
last simmer, thank you in advance!  I have had much assistance over the
years!  At the end of the summer last year after a 1200 mile trip my engine
started acting up.  It starts well and warms up smoothly.  As soon as it
gets warm, simply at idle it starts running really rough as if it is running
on only 2 or 3 cylinders.  Also black smoke from the exhaust.  It I try to
drive, or rev the engine, it will accelerate very poorly, missing terribly.
I have been searching the archives to no avail.  Can anyone offer an idea at
to what is going on?

Thanks,  Finn Runyon