Flare and IAC at Startup

[david4451]

Living in The Philippines, I'm always buying spares to replace common failed parts, even though there is no problems at the present.
Well Amazon had an IAC on warehouse deals for $36, so I bought it. Took 2 months to get here and it's the wrong hand on the electrical connector! Amazon were full of apologies and gave refund.
So I decided to try and open this IAC and turn the connector. After removing aluminium holding electrical connector, internals would no way come out, so I'm NOT worried about damaging this IAC I held electrical plastic head in vice and tried to turn to correct position, with difficulty it turned to correct position.
I'm expecting that the electrics are now broken. To my amazement it had continuity. In my quest to dismantle the plastic end has gasket maker in it, covering a allen keyed plastic plug. I removed this and it is a damper with spring. I put this back and tightened it down, till it closed the plastic valve in opening in valve closed.
I was not sure what to expect but I put it on my ST and started no problem RPM at start was 1200, and at tick over(warm) 500. I went for a 20 minute drive and all was fine.

So my original good IAC, RPM 1500 at start tick over 600(warm) now I thought that I could re set allen keyed damper, so I tightened it one turn plus minus, to my surprise this reduced start RPM to 1200 and tick over to 500.
My conclusion is that IAC is adjustable with this allen keyed damper which is hiding under gasket maker type filler in the end of IAC.
Any comments or remarks??????

 

[david4451]

Just to make it crystal clear, the IAC valve IS ADJUSTABLE.
You adjust the damping of the valve via a hex plastic screw, located in the plastic connection. This hex plastic screw is HIDDEN under gasket maker in the plastic connection end. You must remove gasket maker to see hex plastic screw.

If you have any vacuum leaks it will not reduce flare, so check vac lines are good first.

This is trial and error screwing in to reduce flare 1/4 of a turn until you get 1000 rpm max at cold startup.

I've not found any post dealing with this damper hex screw before, that's why I'm reiterating it, as IAC valve seems to pose a lot of problems.