Could be a fuel delivery problem. Weak pumps can be affected by heat or
a clogged inlet screen (in tank) or filter may be causing vapor lock.
That is the reason most manufacturers now put a filter after the pump.
Remember, as the engine is running, the pump is pushing more fuel than
is being used. The returned fuel has picked up heat from the pump and
the engine compartment. That may be why VW stayed with hoses instead of
metal lines. Any way, as gasoline is heated, the vapor pressure
increases, the suction side of the pump creates a vacuum, fuel boils,
and you get drivability problems.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of John Lane
Sent: Friday, July 21, 2006 7:49 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: 1.9 hot weather issues

This is possibly a Temp 2 sensor issue..if the sensor goes bad it tells
the puter it's cold (engine) and adjusts the mixture accordingly...when
it's hot, it basically floods the engine.

----- Original Message ----
From: don spence <dkspence@TELUS.NET>
To: vanagon@GERRY.VANAGON.COM
Sent: Friday, July 21, 2006 5:11:41 PM
Subject: 1.9 hot weather issues

83.5 1,9 wbx.
Good compression, New rotor, cap, plugs, wires, coil.  Checked spark
and it is strong. Fuel pump buzzes when it's supposed to. ( At
ignition on for a few seconds, then again when the engine is cranked.)

Starts well and runs strong until... Hot day like today, +30 C.

Then it starts easy runs strong until it heats up at which point it
does not like to come off idle.  If you play gently with the
accelerator it will catch and pull strong until you shift, when it
behaves like there is no fuel for a bit then catches and pulls.
Eventually it stalls at idle and will not restart until it has cooled
a bit.

  We pulled a plug and it appears light grey which I'm taking as a
sign it's running lean. Yes?

Could this be an AFM issue?

How do folks in the sunny south keep these things running??

Baffled by it all.....
don