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Old 11-22-2002, 05:51 PM   #1
cRayZee
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Join Date: May 2001
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2001 2.5RSTi
2007 Legacy Spec B

Default adjusting idle?

How can i adjust my idle? I just installed a tec II and was informed to raise my idle. Currently, it's idling at ~670 rpms, and would like to raise it up to ~850. I was told there's a screw on the TB that i turn to do this? I can't seem to find this.. anyone have pictures or anything?

thanks,
Vic
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Old 11-22-2002, 07:38 PM   #2
ciper
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Default

I suggest you delete this post and instead ask in the Engine Management forum...
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Old 11-22-2002, 07:52 PM   #3
cRayZee
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Default

i'm not asking how to tune the tec to change the idle. I was informed that there's some kind of screw on the Throttle body or something to raise the idle.

The stock ECU is still handling the idle, not the TEC. I just want the idle raised up a bit.

-vic
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Old 11-22-2002, 09:50 PM   #4
Albert
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Default

I think you're looking for the Idle Air Control (IAC) valve. I can't say specifically where it is on a SOHC engine, but...

On my MY98 it's monted on the side of the TB by two screws, one will have white paint on it from the factory. The one with the paint is the adjusting point (note that hole is elongated). BTW, it's black w/ a light blue top and electrical leads.

If you move it too much you will throw a CEL.

****Mark the position of the screw with a scribe before you start so you know where to go back to JIC.
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Old 11-23-2002, 06:19 AM   #5
cRayZee
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Default

i don't think my car has that screw...

Also, the ecu is already throwing a CEL cuz the tec replaces the stock O2 sensor



-vic
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Old 11-23-2002, 10:17 PM   #6
Albert
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anyone...
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Old 11-24-2002, 01:58 AM   #7
NicGordon
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Default I don't know but...

I'm not really sure....but here's a warning:

Don't adjust the "Do Not Touch" screw!

read here:

http://www.endwrench.com/pdf/fuel/DontTouchInfoF00.pdf
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Old 11-24-2002, 04:57 AM   #8
cRayZee
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ok, I might've solved the stalling problem already... had to mess with the tec's tps voltage settings and sensitivity.


-vic
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Old 11-24-2002, 03:29 PM   #9
Legacy777
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Default

The idle is automatically controlled.

here's a pic of one of the throttle stop screws



here is the bottom stop screw.....



Don't touch either of these screws.

They are adjusted at the factory so that the TB flows a certain amount of air.

Idle is controlled via the IAC valve. When you adjust the screws you can take the IAC valve outside it's operating range and cause issues.

On the older IAC valves you can turn the electro-magnetic servo motor slightly, and it will bump the idle either up or down slightly. The ECU should leave it alone since it does not know the IAC was taken out of it's "calibrated" factory state.

The newer IAC valves on the TB itself.......I'm not 100% sure if there is something similar you can do or not.

However....bottom line.....really shouldn't have to adjust those things if everything else is ok......it sounds like you adjusted some stuff to get it working.
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