1998 C 280 - How to change spark plugs - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 01-14-2012, 08:54 AM Thread Starter
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1998 C 280 - How to change spark plugs

I have a 1998 C 280 that is giving me misfire codes. I got these codes on 2 different cylinders. Once on Cyl # 1 and once on Cyl # 6 . Car has 120k and i purchased with 96k about 3 years ago. I've never replaced spark plugs in this car. I noticed coil has two wires per cylinder. Does it have double ignition? How do the wires remove? Do they just pull off? Don't want to mess anything up. Can anyone advise on how to replace spark plugs?
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post #2 of 3 (permalink) Old 01-14-2012, 12:06 PM
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OBD most often reports symptoms and not the disease.

The most likely cause of these symptoms is failed Mass Airflow Sensor, a common problem on this engine.

You can get an official Mercedes service DVD which explains quite nicely how to replace MAS (and spark plugs, too, if you must).

Star Service CDs and DVDs

Kent Christensen
'07 GL320CDI
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post #3 of 3 (permalink) Old 01-14-2012, 04:51 PM
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Can someone tell me what the trick is to remove spark plug caps on a 91 Mercedes sl300??
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