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Q:

how can we adjust timing chain tension on 2000 Toyota Echo

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
a rattle in top left moter.just a littler to start with now most of the time sounds like a pulley lose we have no code for this
(1) Answer
Timing chain tensioner or guides may be worn out. Might want to replace as complete set(chain , guides and tensioner) depending on miles and general condition of car.