2000 Ford Expedition 5.4
There are three idler,s,one tentioner ,and two idler,s.What,s your problem?
If it knock,s it more than likely is the tentioner idler bad.
Sounds like a weak tension spring. Replace tensioner.
Looking for a Used Expedition in your area?
CarGurus has 23,042 nationwide Expedition listings starting at $1,100.
Search Ford Expedition Questions
Ford Expedition Experts