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Testing Auxilliary Air Valve 200 1980

posted by  Ten Sleep on  Mon Feb 6 06:41 CST 2006
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last visit: Mon Apr 14 16:35 CST 2014
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I am working on a 1980 245 DL with the B21F motor. I am tracing down bad vacuum lines and in the process, identifying problems with the cold start circuit. I have already idendified a bad thermal time switch.

I also tested the auxilliary air valve by applying +12 VDC across the terminals. I observed the damper opening slowly rotate to a closed position in approximately 30 seconds. I then removed the voltage and watched the damper rotate to an open position in the same amount of time.

I then tested for voltage at the wiring harness between the two leads - with the key on, no voltage, and with the motor running, no voltage. It looks like this valve is sourced through the fuel pump relay (blue wire?). I checked that wire at the relay, and it is switching +12 VDC. Are there any other components between the relay and the auxilliary air valve? My diagram indicates not.
--
Ten Sleep 1980 245DL 1995 850 Turbo






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