Benz designed resistance into the wiring/terminals. The use of resistor plugs upsets the ignition equation and will result in suboptimal efficiency.

My solution, eliminate spark plugs altogether.

How are you going to light the fuel? With a match?

Someone said that it's best to rely on your MB dealer selling you the right plugs. NO!

My MB dealer sold me 2 lots of resistor plugs for a total of 200 Euro before I took the matter in hand and put in non-resistor Bosch plugs. Result: more even idling and eliminated misfire. This on a 1991 M104.980 engine.

I now get Beru or NGK for about 2 Euro each and all is well. MB in my neck of the woods (France) can be utterly clueless on older car issues.

It is most important that all HT components on my engine (and similar) are of the highest quality and in perfect condition. For me, this means MB for everything apart from plugs. Failing that, Beru or Bosch caps and rotors. NOTHING else, in my opinion.

The best to all.

RayH

Indeed. I went with this solution as well.

When you compress a gas, it gets hotter. Compress it a lot, and it will ignite fuel on contact. Rudolf Diesel was on to something good. Besides, the cool kids know that real Mercedes Benzes don't have spark plugs

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.