1990 Buick Century Engine shakes

1990 BUICK CENTURY
71,600 MILES • 6 CYL • FWD • AUTOMATIC
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MMIRRO
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  • 3 POSTS
Engines shakes and there's a rattling noise. The car starts and runs, without any stalling or backfires. It runs slow and rough but the shake is always at the same rhythm.
Aug 5, 2010 at 6:43 PM
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MMIRRO
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  • 3 POSTS
I'm answering my own question. I replaced the catalytic converter, it was broken inside and that caused the rattling. The engine was still shaking though. Then I checked for spark and found no spark from the 3-6 coil. The coil tested good, so then I replaced the ignition module and that fixed the shaking problem. I didn't have to buy the ignition module, it was a part saved from five years ago, when a lot parts were replaced in a trial and error desperation.
Aug 5, 2010 at 7:30 PM