Denso Plugs

[Macon Marauder]

Wondering about the Denso plugs that Dennis recommends and sells:

The Marauder's been running a little rough and getting lower gas mileage. Yesterday I pulled a couple of the plugs to have a look. They both have some green build up on the electrodes. Looks kinda like what nature does to copper I think.

I had no idea how to - or even if they needed cleaning so I just put them back in.

Could this be a sign that the engine is running a bit rich?

Anybody know what normal wear looks like on these puppies? I've got about 4,000 miles on 'em...

[cyclone03]

Base area should be black.
Center ground electrode,clean no build up.
Porcelin,white,no color or build up.Watch for "pepering"on porcelin this indicates detonation.

All plugs should look the same.

A story......

Like you I had a little roughness so I pulled the plugs for a look.
All fine except #4(rear most on right side).
But before I got to the plug I noted WATER around the coil.Blew out water and pulled plug.
The base,or threaded area was clean,By clean I meen nothing on it,looks like it was never installed.
Just to troulble shoot I moved that plug to #3,and the coil to #1.
Put it all back together and everything was fine.

[Macon Marauder]

cyclone03,

Thanks for the feedback. You've got me really wondering now...

I pulled the front 2 plugs on the right (psngr) side. Didn't see any water. The ends of the threads on both had a black, flaky looking build-up on them. Both the center and "top" electrode had the green "plaque" or whatever it is. The first plug was slightly worse off than the second.

After only 4K miles I expected them to look better.

[cyclone03]

You know that could be the gas your using.
Do you always us the same brand/station?
Try switching if you want.
More than likely nothing is wrong.


As for water,look for a white residue around the coils.