1997 Kia Sportage high idle

DEEPS

MEMBER
1997 KIA SPORTAGE
2.0L
4 CYL
4WD
MANUAL
150,000 MILES

Replaced the iac valve, cant detect any vacuum leaks, car idles and runs perfect, BUT the cars idle stop screw is completely backed out, not touching anything. Im stumped. It idles at about 800 rpm this way. Turn in the idle screw and the idle raises. The car runs perfect for the last five years this waybut I just gotta know why. It ran this way before I replaced the iac valve also. Throttle position sensor?

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Try cleaning the throttle plate on both sides with choke cleaner first. The computer controls the idle not the stop screw

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Saturday, May 10th, 2014 AT 3:57 PM

DEEPS

MEMBER
2 POSTS

Ok, look at it this way. The car idles too high. When I bought it, it was idling at about 1300 rpms, so I backed out the idle screw all the way off to get it at 800 rpms. Thats the lowest it will go. Im assuming that it wasnt designed that way. Otherwise why would there be an adjustment screw. So ive done the obvious, cleaned the throttle plate, checked for vacuum leaks, replaced the iac valve, checked the timing, the egr, pcv, brake booster etc. Thats why I was wondering about the tps sensor. The car shouldnt even run at all with the idle adjustment screw removed, should it?