[W126 Coupe] HELP! resistor vs. non resistor plugs

[eurotech1 at charter.net]

Hey folks,

  You can't use resistor plugs with OEM MB caps or wires. There's a resistor in the plug boot and in the cap tower. MB says non-resistor plugs . If you use resistor plugs, it will act like it has a bad set of wires on it.

                   Later,
              Christopher Huffine

============================================================ 
> From: "Richard Hogarth" <R_Hogarth at Foundrycove.com>
> Date: 2005/09/21 Wed PM 08:56:43 EDT
> To: "'Mercedes Coupes Mailing Lists'" <mbcoupes at mbcoupes.com>
> Subject: RE: [W126 Coupe] HELP! resistor vs. non resistor plugs
> 
> That's curious. My oem plug wires only accept the non-threaded plug top.
> I'll have to double check the manufacture of my wires. 
> The resistor in the plug is giving you a significant drop in spark kernal
> temp. 
> Just for shits and giggles.  Pull the plugs and gap them to .028. 
> What wires did you put in? Are they generic or MB?
> Most plug instrutions say not to use anti-seize on the threads. Anti seize
> is not a great conductor. But there is more than enough metal to metal
> contact at the ft/lbs that it takes to seat a plug, tapered or gasgeted.
> I've been using anti sieze for over 30 years on plugs. 
> Don't completely goop up the plug, just a tiny smear vertically across the
> threads from top to bottom. 
> 
> 
> -----Original Message-----
> From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
> On Behalf Of Tom Oelsner
> Sent: Wednesday, September 21, 2005 7:14 PM
> To: mbcoupes at mbcoupes.com
> Subject: [W126 Coupe] HELP! resistor vs. non resistor plugs
> 
> This afternoon I replaced my plugs to see if I could smooth out my idle that
> occasionally ran a tiny bit rough.  RH...you cannot use Rapid Fire #4 plugs
> as they have a one piece top that does not mate with the Bosch wires.  Also,
> AC Delco says do not use any anti seize lube on threads...
> 
> So here is my problem.  The parts store did not have W9DC plugs in stock but
> had WR9DC (resistor built in).  I queried him really hard about them and he
> said they would be fine and would not impact performance.  So I gapped them
> to .040 and put in new ignition wires (even though the old ones were only a
> year old, I broke one pulling it.  So I replaced all.).  Well the car idles
> really badly.  This is in spite of the fact that 3 of the older plugs were
> really fouled.  So my question is obvious.  Are the resistor plugs causing
> rough idle problems?
> 
> Tom Oelsner
> 90 560SEC
> 
> 
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