Hi Gary,
    If not the afm then the temp 2 sensor.  Also check the grounds on the
left head and the ones on the body near the coil.

Darrell Boehler

----- Original Message -----
From: Gary McEachern <glmce@HOTMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, January 09, 2000 11:12 PM
Subject: Surging Idle fixed! / High O2 sensor readings

> Hello list folks
>
> Today I found the causes for the continuous surging I was experiencing on
my
> newly acquired 87 GL.
> These were:
> 1.) Two small hoses connected that are connected to the throttle and
> stabilizer valve had become disconnected on the back side of the firewall
> leaving 2 sizeable vacuum leaks.
> 2.) The idle stabilizer control unit was bad. I disconnected the input to
> the stabilizer and the idle smoothed out noticeably. I exchanged the valve
> and control unit from my other van which confirmed the stabilizer control
> was bad.
> If anyone has a good idle stabilizer for sale please p-mail me!
>
> While going through the troubleshooting, I disconnected the O2 sensor and
> monitored its voltage with a DVM. The voltages read in the range of .8 to
.9
> volts! With the same test setup the voltage off the O2 sensor on my other
> van is .5V which is what I expected. I also substituted the AFM, bellows
and
> associated hoses from my older van to the newer van with no effect.
>
> >From these readings I must assume the new van is running very rich at
least
> when it is not running closed loop.
>
> What are some of the likely scenarios that would cause these high O2
sensor
> voltage readings? I expected the AFM substitution to improve or correct
the
> problem but it made no apparent difference. Any suggestions?
>
> Gary
>
>
> Gary McEachern, Reading Ma.
> '84GL Sunroof
> (2) '87GL Wolfsburg Weekenders
> '75 Spitfire
>
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