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Q:

clicking sound on 2003 Buick Park Avenue

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my engine makes a clicking sound from a cold start up and then stops after warming up. What could this be?
(1) Answer
This sounds like an exhaust leak, most likely the exhaust manifold gaskets. You can get an estimate on this repair here: http://repairpal.com/estimator?car_type_id=3655
and find a shop to perform the repair here: http://repairpal.com/directory?address=60160&car_brand_names=Buick
The shop will need to inspect this first to diagnose the problem.