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Old 01-07-2013, 07:43 PM   #1
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idle adjust screw uses

I know the idle screw is not meant to be touched but is it possible to adjust it just a little to allow more airflow into the engine for a smoother idle in drive. I dont have a terrible idle but I feel like it would benefit from alittle more air. Can u change the screw slightly to do this?


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Old 01-07-2013, 08:12 PM   #2
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The IAC controls your idle speed.
If you open the throttle blades at idle, the IAC will reduce it's airflow to compensate.

You have something else going on, probably the PCV.
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Old 01-07-2013, 09:25 PM   #3
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From use the throttle stop screw may 'settle' or wear slightly and then the throttle blade may stick closed a little. moving it can stop the sticking.
that is about the only reason to adjust the screw.
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Old 01-08-2013, 12:46 AM   #4
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More likely for carbon to build up on the butterfly edges to block the air crack. Regardless, the PCM will simply reset the idle right back where it belongs.
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Old 01-08-2013, 12:57 AM   #5
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I just installed a Focus Central TB and it revs at 1600-1800 RPM's the screw is just touching the plate. The return spring is pretty rusty and weak.

So to the OP, what does the return sping look like? Worn? Rusty?
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Old 01-08-2013, 02:19 AM   #6
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Any adjustments you make will not last, the computer will compensate and return the idle to the programmed idle speed. Why would you want to change it anyways? If it's running good there is no need to. If it's feeling a little rough in drive you should probably check or change your motor mounts. Those are one of the number 1 reasons for vibrations, not idle speed.
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