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  #1  
Old 10-26-2005, 03:38 PM
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Join Date: Dec 2003
Location: DFW, Texas
Posts: 88
Ignition: 420 SEL

Hi, I have a 1988 420 SEL @ 101K miles. The plugs, ignition wire set, and distributor cap/rotor were last replaced at just under 50K. Within the last month or so there have been a few times when the car didn't start right up. Given the facts do you think it's time to replace the parts listed above?

P.S. I'm asking the question b/c about a year ago I paid for a full diagnostic and the ignition was cited but I decided to put it off until absolutely necessary. Thought I would poll the group here especially since i don't want to pay again for a diagostic which was done in a different state from where I now live.

Thank you much.

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Old 10-26-2005, 09:47 PM
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smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
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What plugs are in the engine now?

Sixto
87 300SDL
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Old 10-27-2005, 11:31 AM
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Location: DFW, Texas
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I can't see the brand stamp on the plugs. As part of the diagnostic done last year, we turned off the shop lights and I could definitely see elec arcing upon startup. After 50K miles would it be unusual to have to replace everything - plugs, wire set and distrib cap/rotor? I tried searching the web but came up with nothing especially since old MB manual are now only available on disk. Thanks for the help.
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Old 10-27-2005, 05:18 PM
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smoke gets in your eyes
 
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Some folks experience problems with platinum plugs.

Sixto
87 300SDL
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Old 10-27-2005, 10:32 PM
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Location: Atlanta, GA
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If you are seeing arcing that was the time when it was Neccesary..since then you have been getting far from ideal combustion. With wires sparking I would bank on a full replacement. Wires (use Beru) cap, rotor and plugs. Do NOT use platinums.

Jonathan

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