My Expedition runs high it used to run at 750-850 rpm in idle but now it 900 to 1000 rpm at idle. I don't know what the problem is I have cleaned my throttle body changed the throttle body gasket replaced my IAC valve and the PCV hose that is notorious to have a vacuum leak. It has no check engine light. The truck does everything fine tho it drives fine its just the damn idle.
I don't know what else can cause a high idle can someone guide me in the right direction to find whatever causing it.
My Expedition runs high it used to run at 750-850 rpm in idle but now it 900 to 1000 rpm at idle. I don't know what the problem is I have cleaned my throttle body changed the throttle body gasket replaced my IAC valve and the PCV hose that is notorious to have a vacuum leak. It has no check engine light. The truck does everything fine tho it drives fine
Did you use an OEM part when you replaced the IAC? Without more data, this sounds like a vacuum leak. FWIW- Engines often need to relearn their idle after a throttle body cleaning.
I put on a Motorcraft IAC valve so its an OEM valve.