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Old 11-08-2010, 07:44 PM   #6
FordACE
Fast Ford to the Future
 
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Join Date: Dec 2004
Location: Brisbane
Posts: 2,493
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rattle is bad, means the biscuit (not one you can eat), has become dislogdged. The catalytic converter resides in your exhaust system, it's role is to change the gases dispelled from the car into something less toxic. if it becomes blocked, the car struggles to exhaust it's gasses and thus, the engine struggles to operate effectively.
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