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Old 11-17-2002, 01:44 AM
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Join Date: Jan 2002
Location: Hong Kong
Posts: 47
Buying 500SL with rough idle??

I am considering buying a 1991 500 SL which suffers from a rough idle condition.
Once teh engine is warmed up everything seems ok, excpet maybe that I imagined I would get more power. The roughness to me sounds like a stuck valve, but nothing shows up on a compression check.
Any ideas??
Vince Alfonso (in Hong Kong)

92 MB 600 SEL
94 MB 600 SL
92 MB 500 SL (for sale)
93 BMW 740i
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Old 11-17-2002, 01:53 AM
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Join Date: Jan 2001
Location: oregon
Posts: 2,013
have it pluged into dealer or better yet independent shop computer takes about ten minutes
will tell you everything but the color of your socks............
William Rogers........
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Old 11-17-2002, 11:20 AM
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Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
I agree with the previous post. Check for diagnostic codes either by taking it to a mechanic or doing it yourself as explained many places on this website (recommended). You'll want to specifically check the CIS fuel injection (socket 3 of the diagnostic connector) as well as the ignition (socket 8).
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Old 11-17-2002, 10:12 PM
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Join Date: Mar 2000
Posts: 532
Check all idle air circuit hoses - betcha some are heat fatigued and cracked.
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