Question about 1998 Ford Expedition
Start with the vacuum hoses on the motor, this will do this. the vacuum hoses are rubber hoses three quarter inch in diameter on down to real small hoses and can be located anywhere on the motor or under the hood. Look for a hose off, cracked, broken, or loose at a connector.
Posted on Mar 16, 2011
Its not the throttle position sensor! I just dealt with this 30 minutes ago... A large EVAP leak is detected... Which means one of the 3/4 inch vacuum hoses slipped off or is deteriorated! More than likely the hose connection to the back of the "top-middle" section (intake manifold i think). This hose also connects to the valve cover, on the side where the engine oil is added. I dont know the name but its that one. Follow that hose to the back top of the engine... You can barley see if it came off so it's easy to overlook!!!
Posted on May 10, 2012
Sounds like hou need a new IAC sensor they go bad all the time its a comon thing in the expeditions mine did the same thing I. replaced the IAC ad bingo runs like a charm they are relativly cheap about 40-50 bucks hope this helps
Posted on Sep 21, 2014
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Posted on Jan 02, 2017
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