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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