Pancho

What should resistance be on OEM plug wires ?

I want to test my wires for resistance.
What resistance would indicate that my wires are good on my year 2000 CLK430 ?

Pancho

So, the thing to do is to not respond to any postings. Hmmm, so that's the way forums work. Imagine that. Foolish me. I thought we were supposed to respond. Oh well.

insame1

i could respond with i dont know. would that make you feel better?

Pancho

I would bet that made you feel better, little boy.

Ausmbtech

They should be 2000ohms, although from experience I've found leads within this resistance to be faulty and leads outside this resistance to be servicable. A oscilliscope is still the best way to check them.

Pancho

Good info, thanks. Have read some postings stating that these wires should last forever, it not abused, ie. pulling on wires instead of ends; not using the correct tool; etc. Still, as individual replacements, each wire adds up to a pricey sum. Seems best to just buy a wire set. I think Bosch is the OEM and a set of those is under $200, as opposed to the $400 Denso set.

Am going to use my meter to test each one just to know which one is bad, then will replace the whole set.

One last question: Have you any info on how to test a coil ?

Again, your info is much appreciated. Thanks.

PS. An oscilloscope. Imagine, having your own oscilloscope. Would be nice, and I like the mad scientist angle, too. Maybe someday. I don't think they have them at Harbor Freight.

Ausmbtech

Unfortunately the coils have a diode in the secondary coil so they can't be tested with a ohm meter. They very very rarely fail, if they do then they usually dont fire at all. I've only ever seen one that was intermitant and that was in training (and even that I think they tampered with it to actually make in fault intermitantly).

Id stick with the bosch leads, but thats just a personal preference.

Pancho

Again, very good info.
Thank you very much.