Problems for specific Ford Expedition years:
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2002 Ford Expedition Problems
There is a technical service bulletin for the V8 engines regarding a possible problem with the spark plug being ejected from the cylinder head, damaging the threads in the spark plug hole. If the vehicle is under warranty, cylinder head replacement is recommended. If the vehicle is out of warranty, Ford authorized the use of a specific thread insert to repair the head.
The PCV hose may crack, causing the vehicle to idle roughly, this may or may not illuminate the Check Engine Light.