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#1
09-21-2009, 04:57 PM
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Spark plug confusion
No, this isn't another typical spark plug thread....
I have an even dumber question...... On my '88 560SEL, as I was troubleshooting the car this weekend, I pulled off the spark plug wires to discover that the spark plug terminal ends were never screwed onto the plugs. I've noticed this on lots of German cars before, but of the 3 or 4 W126's I've worked on, I've never seen one that didn't use the plug ends. Did the PO just do something dumb, or are there certain models of W126 that don't need the terminal, and the boot just goes right over the screw thread? Looking into the boots, it's hard to tell - it looks a tad too large to not use the terminal ends, but perhaps too narrow to use them. They are Bosch OEM style plug wires with the metal boots and the plugs are Beru. It is possible that all I have seen before are aftermarket plug wires? The ones in my 300SE are aftermarket to be sure..... Thanks......
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition 
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#3
09-21-2009, 06:05 PM
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Thanks for the reply.... Any easy or visual way to tell them apart?
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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#4
09-21-2009, 07:25 PM
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plug terminals
On your engine the wire terminal end is designed to grip the threads on the plug. The screw-on caps are not used.
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