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#1
10-13-2006, 09:28 PM
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spark plug condition?
1992 500sl. I have been adjusting the fuekl mixture and the rough idle has disappeared.
Can I find out if it's too lean by the color of the spark plu electrode after a few miles? white, brown, black, ash color being what I'm looking for I guess. The DYI information is pretty complex and I adjusted the mixture to the place wher the engine was running smoothest, I'm concerned about running too lean and causing damage to the engine. opinions please.
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Thanks, Juan 
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#2
10-13-2006, 11:40 PM
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Overly lean condition will produce pinging, usually at low RPM under moderate to heavy load. Try getting into highest gear on the highway around 60 mph and applying heavy throttle, though not enough throttle to cause a downshift. If the mixture is lean, you will likely hear pinging.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#4
10-14-2006, 08:30 AM
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really, too, if it is too lean it wont idle correctly or run smoothly.
lean running should make your plugs white. black is too rich. light brown is the correct color. in the old days of lead gas a light gray coating inside the tail pipe was indication of correct mixture too. but now there is only black which in the lead days indicated too rich. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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