1992 Chevy Lumina rattle underneath and engine miss

1992 CHEVROLET LUMINA
87,000 MILES • 6 CYL • 2WD • AUTOMATIC
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TNMAN6978ZH
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My 1992 3.1 has an engine miss and rattle coming from unerneath the car. It was running fine when one day I started it up and it had a miss. There is a rattle coming from underneath since I bought it. It has slowly gotten worse. I changed plugs and wire, with no difference. It seems like the exhaust has gotten louder since the miss in the engine. If it is the cat, how can I tell for sure? No check engine light on. Any clue? Thanks!
Jul 11, 2010 at 7:44 AM
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JALOPYPAPA
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Someone needs to look the exhaust system over carefully. The ceramic substrate material inside the cat can break and rattle when you shake it, in which case you need a new cat. But it sounds like you have a hole or maybe a loose connection somewhere, which could cause a rattle.
Jul 12, 2010 at 3:34 PM