[W126 Coupe] Denso Iridium Spark Plugs and the SEC

[gary peck]

Hi Figster, this is Gary from Canada. The Iridium plugs are in my SEL 560
Euro with the 300 hp engine, my SEC 560 also has the Euro engine with stock
MB plugs. The SEL has only been driven about 4,000 klms since installing the
Iridium's, at this period of time she runs silky smooth, idles correctly,
and talk about pickup shes a rocket. There is one small problem, sometimes
on initial cold startup I have to fire up twice, this may be just in the
fuel monitoring system, never a problem with a warm engine. Is anyone else
experience this?

MBGary
----- Original Message ----- 
From: "a figment of the imagination" <figstir at yahoo.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Sent: Thursday, September 08, 2005 1:41 AM
Subject: Re: [W126 Coupe] Denso Iridium Spark Plugs and the SEC


> Hi all!
>
> Okay, here's a question for debate that has been going
> on for some time on all the Benz forums.
>
> What is the premium spark plug for the SEC?
>
> Today, I just completed a tune-up job for my 380 SEC.
> As part of the many normal things one would do during
> a simple tune-up, I replaced my Bosch Platinum-2's
> with Denso Iridium plugs, instead of the Bosch Supers
> (W9DC's..).  Instead of going back down, I went up...
>
> I know Gary (from Canada) uses Iridium's on his 560
> SEC.  So far, I am not aware of any complaints.
>
> The one improvement I noticed right away was that the
> misfiring I had after the huge downpour went away, but
> I think the reason this was fixed had to do with
> replacing my most likely worn-out or damaged dizzy cap
> and rotor.   Nevertheless, with these Iridium plugs
> the car just fired up so quietly and smoothly.  It was
> an impressive change.  I haven't driven it yet, and am
> waiting for a response.  In general, with the more
> efficient spark, I expect to gain improved performance
> and better fuel economy.
>
> However, my concern here comes after reading about so
> many others who warn of not using anything different
> than the Bosch Supers.  I truly do not understand the
> dangers of using Platinums, Platinum 4's, or Iridiums.
>    I also have not seen any *new* original literature
> from Bosch or MBZ that warns against these *newer*
> plugs.
>
> 1) Are these truly justified contra-indications?
>
> 2) What is my biggest risk in using these Denso
> Iridium plugs?  Do I need to take them off right away
> before I supposedly destroy my engine, an argument for
> which I have not seen one solid basis for as of yet.
> Please advise.
>
> Thank ya!
>
> -figstir
>
>
>
>
>
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