Very High Idle at start up

[Bigwilly1277]

I have a 93 Exploer with a 4.0. When I start it up every time, my idle will jump all the way up to around 2G's at stay at about 1500 for a very long time. I just recently change the plugs and wires, and had a new injector put in. My filters are new as well. I just can't understand why it's running so high. I mean this problem just started about a month ago. In the past, when I started it up it would settle at around 800-900 like clockwork.

Any ideas?

[carr17]

It sounds to me like either your idle Air Control is getting stuck open at start up or the computer doesn't know it's coolant temp. Try replaceing the cooland sensor and cleaning out the idle air control with some electrical cleaner. Tell if this fixes the problem.