Is there a timing mark on the engine? And where is it? on 2000 Ford Explorer

The truck has a bad mist. The garage says it needs a timing chain.

by in Lima, OH on January 29, 2013
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2 answers 2 comments
ANSWER by , January 30, 2013
explain bad mist please
COMMENT by , January 30, 2013
the engine idles up and down.
COMMENT by , January 30, 2013
do u have any engine codes?
ANSWER by , January 29, 2013
Hope this helps you