An illuminated Check Engine Light could indicate that one or more of the ignition coils has failed due to excessive spark plug gap. To fix this problem, the ignition coils that have failed, the spark plugs, and all coil boots should be replaced.
Problems for specific Ford Expedition years:
Car problem reports
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Most reported 2001 Ford Expedition problems
The PCV hose may crack, causing the vehicle to idle roughly, this may or may not illuminate the Check Engine Light.
Intermittent rough idle may be caused by the EGR sensor sticking, causing the EGR valve to stay slightly open. Our technicians tell us the valve and sensor must be replaced together to correct this concern.
humming noise from engine when starting cold. faulty idle air control valve causing noise,can tap on valve and noise will go away. must replace valve to fix.