High idle problem with 5.0L HO engine

It idles about 2000 rpm. At first it would only idle high a few seconds when you first started it up. Now it idles high, ALL the time.

I pulled apart a few wiring connectors and all the contacts look clean on the idle air solenoid, TPS and maf sensor.

What could be wrong and how should I check it?

Dan S

It idles about 2000 rpm. At first it would only idle high a few seconds when you first started it up. Now it idles high, ALL the time.

I pulled apart a few wiring connectors and all the contacts look clean on the idle air solenoid, TPS and maf sensor.

What could be wrong and how should I check it?

What happens when you pull the plug on the IAC motor/solenoid? Report back on this... also, it could be dirt or debris holding the throttle butterfly open a crack.

Rob

It idles about 2000 rpm. At first it would only idle high a few seconds when you first started it up. Now it idles high, ALL the time.

I pulled apart a few wiring connectors and all the contacts look clean on the idle air solenoid, TPS and maf sensor.

What could be wrong and how should I check it?

Dan S

By IAC motor / solenoid, do you mean the air conditioning compressor? = The air doesn't work so compressor isn't kicking in.

"Dan" wrote

Nope. Idle Air Control valve. Diagonal thingy on the side of the throttle body.

Have you checked the coolant temperature sensor and it's electrical contacts?

No I haven't checked the sensor or it wires yet. I'll have to look = around for it. This is a " new to me car".

I did what the other fellow asked and unplugged the IAC while it was = running. It made zero, zip, nada, no difference. I kept plugging and unplugging it and it never did a thing for the idle.

Does this mean it is defective or just needs to be taken apart and = cleaned?

It looks pretty easy to take off...

I did what the other fellow asked and unplugged the IAC while it was running. It made zero, zip, nada, no difference. I kept plugging and unplugging it and it never did a thing for the idle.

Does this mean it is defective or just needs to be taken apart and cleaned?

It looks pretty easy to take off...

============================ Nothing wrong with trying to clean it first. It is easy to take off, and is a very common problem on Fords of all ages.