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Old 07-26-2013, 05:13 AM   #11
BammBamm
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I'm assuming this also applies to my manual 08 then? Its idling at about 750rpm
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Old 07-26-2013, 10:13 AM   #12
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To properly set the idle (ECU Controls it) unhook the IACV , car should die , restart , set idle to 725 then reconnect the IACV this will put it back to stock TB settings for the ECU to take over

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Old 07-26-2013, 06:30 PM   #13
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Thanks for that Tom, always thought there was some arbitrary value there but not sure what it exactly was. I used to set them by lowering until car would slow down and die but that was on earlier types that IAC defaulted shut, these stay open at default thinking. The cross section of the opening would support some specific rpm number.

Last edited by amc49; 07-27-2013 at 03:26 PM.
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Old 09-11-2013, 09:31 PM   #14
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Quote:
Originally Posted by focituner View Post
I had to adjust the screw to make my TB not stick, I wouldn't call that changing the idle , more like improving Butterfly reaction. But I had to adjust it once, now my car idles like a fricken champ. It took me a couple of minutes of screwin with it but since then no problems.
I just replaced my tb and i am having the same problem with a sticky tb. What did you excatly do?
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Old 09-12-2013, 02:59 AM   #15
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If the TB is sticky while off car then it has been overtightened to warp it out of true flat and grab the shaft. Common with those who go to bigger ones and the gasket then does not seal properly. Or butterfly hitting or scraping the intake bore edge.
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Old 09-20-2013, 03:26 PM   #16
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If you have a weird or low idle, Defiantly consider cleaning out your ICV. i dont know where it's located. but i know i did this on another car and it helped out tremendously.

also, if you still have idle issues, replace your pcv hose and valve. the pcv hose is located under the intake manifold and runs around to the front of the engine. I did mine on the zetec. it was a Bit*# it get to but helped out a lot. I found out after pulling it that it had a crack in it too (apparently common with focuses)


Edit:Typo
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Old 09-20-2013, 08:32 PM   #17
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When you mess with the idle screw the PCM just commands the IAC to move in a different position to keep the idle at same speed. Problem being though, if IAC has run for a long time, it has built up carbon on it, the carbon is normally scraped off as the IAC shaft operates. The IAC going to a new 'normal' position because idle screw was moved then puts the IAC shaft trying to work over a portion of shaft that is now highly coated with carbon, and it then begins to stick. The self cleaning action only covers a small amount of the shaft, not all of it, get in the dirty part and let the sticking begin. Pull IAC (or buy a new one) and clean it without damaging the vacuum diaphragm in there and it will go to not sticking again.

Yes, that means many of you bought new IACs for no reason at all, the old one may well still be good.

Last edited by amc49; 09-23-2013 at 03:32 AM.
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