High idle when driving

[bristol24]

recently my 96 with 230000 mile has been idling high while driving, It will start off normal like around 800 rpm, but as drive for a few minutes and come to a stop it is running around 1700 to 2000 rpm. Any help would be greatly appreciated.

[bristol24]

anyone?

[techtalk]

what kind of vehicle is this?

[techtalk]

the idle speed sensor might need to be replaced

[TedL]

Originally Posted by techtalk

what kind of vehicle is this?

OP writes about a '96 and has posted in the year appropriate Avalon forum , so I'd proceed on the assumption it's a '96 Avalon................

[bristol24]

its a 96 avalon. Has anyone had this problem before?

[bristol24]

could it be the idle air control valve?

[fourwheeler]

from what I've seen before on this forum, when the idle air control valve acts up, it usually causes a low RPM or poor idle, not a high RPM. Is there any codes? Can you have the OBD II scanned. Perhaps there is a code stored even though the CEL is not on. Autozone or other National parts chains will scan the car for free.

[fourwheeler]

any chance your throttle plate is dirty causing it to stick open causing a high idle?

[HATEnFATE]

^ I was going to suggest cleaning the TB as a start. Might clear up the issue might not.

[bristol24]

no codes, I did have it scanned. I will try cleaning the the throttle body, It was just cleaned about a year ago.

[pmesfun]

Make sure all vacuum hoses are plugged in as well.

[robcam13]

sounds like a pcv valve or vacume issue. when it acts up try spraying some brake cleaner at the vacume lines, pcv, tb, etc and listen for any rpm changes.

[robcam13]

mass air sensor may also be dirty

[bristol24]

The trottle cable goes to a box near the battery, in the box the cable wraps around a half wheel, that wheel has a broken spring, anyone know what that part may be?