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what year moters and models will fit and work properly on 2003 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
timming chain jumped and i replaced them all 3 and know it wont start
(1) Answer
here the computer is the biggest issue. now a days you have to replace with same or spend big bucks at a performance shop to change engine. as far as it not starting if it's an interference engine it may have damaged the valves and or pistons. the heads or engine may need major work