It's probably the same noise (pinging) that you hear when you get bad gas or the octane is too low or with a stick shift, being in the wrong gear (too high) when your trying hard to accelerate. The PT has a knock sensor but it sounds like it's not working. Get to a professional...if it's doing it all the time, you can damage your engine.
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 ...just CREWZIN along! ® . . . PT Cruiser Links Moderator 
2000 PT. Original Owner, 110,000 miles
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