Mechanics

IDLE SURGES UP AND DOWN

2003 Ford Expedition • 121,000 miles

I own a 2003 ford expedition 4.6 2wd the idle surges up and down and is idleing high. Replaced the idle air control unit and maf sensor and have taken off the throttle body and cleaned it. I have disconnected the idle air control unit and it runs fine. I dont know where to go from here any suggestions !
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Jesusmancilla
September 16, 2012.



Runs fine? The idle is very low about to stall? Thats where it should be with it disconnected.

I would look around for a vacuum leak. Pcv hose is real common

Roy

ASEMaster6371
Sep 16, 2012.
I would look into the throttle position sensor. I have had that problem a lot with fords. Good luck!

Tiny
Dynamatech
Sep 23, 2012.