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My car does this too. Just started to notice it around 8500 miles. It happens when there is an abrupt acceleration. Wasn't sure if it was drivetrain or what. Some cars with exhaust have had issues where it will shift and contact something when accelerating (I have an aftermarket exhaust.) Some other kinds of cars (Mazdaspeed 3, focus st) have motor mounts that allow the engine to move enough to contact the firewall. Was wondering if that's a possibility.
One thing in my particular case that might rule out drivetrain is I can induce the sound by punching the throttle for a rev match or just abruptly applying throttle while not in gear.
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Last edited by vtmike; 05-30-2013 at 10:50 PM.
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