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Old 11-09-2005, 12:06 PM
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Join Date: May 2005
Posts: 30
420 SEL idles rough

1990 420SEL, 165,000 miles on it. has a "hiccup" at idle. not a solid miss, just a sporatic one while in gear. It does do it on a normal basis. I was wondering if this is common, and a tune up kit would solve, or if it is something else. Also, where is a good place to get a tune up kit (cap, rotor, wires, etc)?
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Old 11-09-2005, 01:01 PM
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
Could be a bad ignition part - but check compression too. Marginal compression in one cylinder could cause intermittant miss in just that one cylinder. First diagnosis would also include ignition scope and vacuum gauge reading.

'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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