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IAC Valve: Does it operate only at Fully-Open & Fully-Closed modes, or are there different positions ? 700 1985

posted by  ndesouza on  Mon Sep 20 13:01 CST 2004
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last visit: Sun Mar 18 15:14 CST 2012
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If the pulse is that rapid, I guess you'll need an O.scope and wont see anything with a voltmeter :(

I've been through the entire sequence of setting the idle-speed. With throttle-body off..

- loosened the TPS screws so it could rotate freely
- loosened the stop-screw so it didn't touch the throttle-lever
- slowly tightened the screw until it just made contact with the throttle-lever
- Turned it another 45 deg. and locked it down
- Adjusted the TPS position until the switch opened as soon as the throttle was opened.
- Installed the throttle body and verified that the TPS switch was ON by checking with a meter at the harness-connector end. Idle still high.

Do you know where on the computer I will find the WOT unput signal ? And what function is served by the red-jumper I mentioned that was at the computer-connector ?

Thanks for the input ! My IAC opens and closes very well with an audible snap, and the valve is very clean. But given that the open/close sequence pulses so fast - the commutator would need to be in perfect order. Wonder if I should open that and check it up. I did try it when cleaning it out (4 pairs of tabs that needed to be levered out) - but it didn't seem to move when I pulled and since I didn't have a spare around didn't want to force it. Maybe the magnets were holding it in place ? Should it come out easily ?

Thanks for the responses !

Noel






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