1993 Explorer with hunting idle

[Shane Fazzino]

Hey guys! My Explorer when at idle it fluctuates from about 700-950 rpm. I tried to clean the IAC and it didnt seem to make a difference, if anything it made it a little more noticeable. It only has 110,000 miles on it and has been regularly maintained its whole life and taken very good care of, just a truck that spent its life on the highway driving from menlo park to tahoe. any ideas of what i should be looking for?

 

[natenkiki2004]

The fluctuating idle means the IAC is doing it's job, it's compensating for something.

How are the plugs & wires?

I'd suspect possibly a misfire or vacuum leak would be what you're chasing.

 

[Shane Fazzino]

its got brand new plugs and wires. where are the common areas for vacuum leaks?

 

[natenkiki2004]

Plastic vacuum lines. Unhook them all (and plug the hole) from the tee at the rear of the upper intake manifold. If your issue goes away, hook them up one by one.