[W126 Coupe] Spark Plugs

[Jonathan]

GreyGarageRuss at aol.com wrote:

> I recently called my local Benz dealer to ask if he had and Bosch 

> W9DCO plugs for my 1988 560 SEC and he said he did.  When I went to 

> pick them up he handed me WR9DC+ plugs. His computer screen indicated 

> that W9DCO'S were Bosch #003-159-10-03, the same number on the box of 

> WR9DC+ plugs.  I didn't take them and when I got home, I checked one 

> of the old plugs in my 560.  It was a WR9DC+.  Apparently the t shop 

> that put in these plugs when I bought the car 3-4 years ago, used 

> these resister ones.

> My question now, is what is the difference....will anything be 

> harmed...should I change them immediately or stick with this type?  

> The car runs very well as is but I want to do the right thing while I 

> am going to put new wires on.

> Thanks,

> Russell

> 1988 560 SEC

> ------------------------------------------------------------------------

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Mercedes has specified in the past that the maximum level of resistance 
is not to exceed 5Kohms or damage to the ignition componentry could be 
damaged.

The resistor plugs on their own have 5Kohms resistance, couple that w/ 
the 1K in the wires, and the 1K in the cap etc and you are well beyond 
the specified maximum.

I would inspect your cap and rotor while doing your wires..chances are 
these plugs contributed to your wires demise.

I would remove the plugs and run replace it with the correct non 
resistor plugs.

Jonathan


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1996 S600 Euro "Scharnhorst"
1991 560 SEC Full Euro ECE (for sale)
1991 560 SEC 226Hp/271ft/lbs (TT conversion IP)
1988 300 TE
1989 560 SEC AMG (Mech.lifter/radical cam conv.)
1986 560 SEL 6.0L 32V AMG
1980 280 SE Euro
2006 Z4 3.0Si M-Spec

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