High Idle

[Jaime]

Hello I have a problem that started a few days ago. When I start it in the morning it revs really high. I mean a lot higher than the normal rev up. And it won't rev down unless I turn it off two or three times then it settles down. It has also done this in the afternoon when I get ready to go home. I researched this and came up with IAC. What do you think? Also is there a way to test the IAC before I replace it. I tried finding the test in the FSM with no luck. Oh it is an 88 4.0 4x4 ba10.

 

Thank You

Jaime

[Boots]

I would try taking the IAC out of the throttle body and cleaning it and the hole it goes into. Mine used to idle high, not that high, but I found that the IAC was getting stuck.

:wrench:

[aquiring93]

There could also be a leak somewhere in the vacuum line..

[Jaime]

Thank you for you help. I tried you suggestion and cleaned the IAC and the hole it goes into and that did the trick.

Thanks again