spark plugs 280 sl - Mercedes-Benz Forum

 
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post #1 of 2 (permalink) Old 07-23-2002, 09:22 AM Thread Starter
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spark plugs 280 sl

I have a 1970 MB 280 sl automatic. For some reason the spark plugs will get black after just about 10 minutes of running the engine. I have tried brand new plugs and replaced the fuel pump. Anyone have any ideas? Thanks.
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post #2 of 2 (permalink) Old 08-08-2002, 12:00 AM Thread Starter
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Re: spark plugs 280 sl

Problem is it's running too rich.<br> <br> This may mean that it just needs a mixture adjustment, but in these cars can also mean that someone has been farting about with the length of the rods that run the different parts of the injection system. If this is the case, you will need to have the system recalibrated by someone who knows what they're doing.<br> <br> By the way, until you rectify this, it is crucial you change your oil regularly - excess petrol has a habit of being a poor lubricant!
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