Do you have an aftermarket exhaust? Some of us had knocking from an aftermarket exhaust from the the part of the exhaust pipe that went over the rear axle. When you it a bump, the rear axle went up and hit the pipe.
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 ...just CREWZIN along! ® . . . PT Cruiser Links Moderator 
2000 PT. Original Owner, 110,000 miles
MY technical suggestions are given in GOOD FAITH without total guarantee, if in doubt go to a Garage.
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