PeachParts Mercedes-Benz Forum - Help finding non-resistor plugs

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)

- Tech Help (http://www.peachparts.com/shopforum/tech-help/)

- - Help finding non-resistor plugs (http://www.peachparts.com/shopforum/tech-help/284905-help-finding-non-resistor-plugs.html)

Quote:

Originally Posted by mbzman (Post 2546655)

I have a uneven idle that I've been trying to figure out. You can hear and feel the engine surge while idling. I did install a new set of Bosch HR9DC plugs and Beru wires last year to no effect. Can resistor plugs make that much of a difference?

Not sure if its your problem or not, but when my moms 300SEL did this (when it was my car) it turned out to be the voltage regulator, but we also had "flickering" lights.

Now I am in the market for new plugs for her car... non-resistor plugs are hard to find... thats whats in there now, I didnt know, but one local MB mechanic said they were not good for the M103 engine.

Update - just went to Advance auto and they were out of the $1.79 Bosch, so got the $1.99 NGK plugs... not the BP5EFS, but 5TK or something like that, lol... that was all the NGKs they had for this car. Guess they are better than whats in there. Oh well. Good luck! :)

Quote:

Originally Posted by ps2cho (Post 2547675)

You can read voltage across the terminals to test it. It is a replaceable part, but you cannot purchase it new alone. You must purchase the entire FD/Airblow block. It is a junkyard swap in reality.

How much for a used distributor?

Quote:

Originally Posted by 86560SEL (Post 2547701)

Yeah, the alternators are pretty weak on these cars considering the amount of electrical equipment they have. My seat heaters will often get bumped off at idle if I also have the headlights, radio and fan going. I don't think the VR is defective though. You are definitely right on the non-resistor plugs being hard to source.

Bosch F8DC4's are usually easy to get at dealer or auto store. It is the most common non resistor plug for most. Comes with washer and is tapered for use without.

I looked those up on the Advance and Autozone websites and brought up nothing, but the Oreille site did, but said limited availability, call store for details...

http://www.oreillyauto.com/site/c/detail/BOS7/H9DC0.oap?year=1988&make=Mercedes-Benz&model=300SEL&vi=1194207&mn=Bosch&mc=BOS&forcedVehicle=true&pt=03435&ppt=C0334