Thread: Another 560 sel rough idle
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Old 10-24-2009, 11:10 PM
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Cigar Havana Cigar Havana is offline
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Join Date: Jan 2003
Location: London Ontario Canada
Posts: 382
Intake Manifold
My 89 420SEL had a rough idle. Replacing the intake manifold O rings made a world of difference. I'm no mechanic. Have you replaced the O rings? If not, they will be rock hard from the heat, and may even be split.
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1989 420 SEL
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