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Mystery Rattle - Only when warmed up and coasting

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Old 29 Jun 2017, 10:35 pm
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Default Mystery Rattle - Only when warmed up and coasting

My 2001 PT Cruiser Limited with auto transmission has 97,000 miles on it. It has developed a substantial rattle that sounds like a suspension or exhaust rattle coming from the left front. It doesn't start rattling until the car has been driven 30 minutes and then only when coasting. It rattles on perfectly smooth roads and when the car is in drive or neutral. I had two local shops check out suspension, brakes and exhaust without finding anything. I replaced the transmission mount and upper motor mount and still no improvement. A gentlemen who worked at a local Chrysler dealer for 30+ years says the flex joint the lives between the exhaust manifold and the catalytic converter is a frequent source of rattles, but can only be replace with a new converter assembly. Another friend suspects the torque converter is not unlocking properly and wonders if the transmission has the correct fluid in it. This car is only worth $1500 so an expensive repair is not in the cards. Anybody experience a similar issue or have any ideas. Thanks and sorry for the length of the post.
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coasting., rattling, torque converter

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