Strangest miss fire yet to date.

I have dealt with many a funky problem with cars.

The last strangest miss fire was spark leaking into my top radiator hose.
New wire, newer hoses. Some principle about the flowing water makes it happen easier.

So now the new one.

Stupid spark plug ends. Never had this happen before.

OK you know spark plugs have an end piece you can unscrew for a different plug end.

Had a strange miss fire but all good hardware. That miss fire got really bad.
but would clean up at higher RPMs like a bad plug.

Well it was a bad plug sorta.

The end piece had unscrewed off the plug from vibration. That is the only thing the wires hold on to. if it comes un screwed or lose. You can get some strange effect. needles to say they were all lose a few turns.


Since the only connection for the end piece and the wires to the plug is the threads. a thread locker could interrupt spark and tightening to much could break em.

So anyways, am I the first to experience this???

 

Yes, that's not very common (any more). No, you're not the first "victim" of this problem.

This used to be more common, since more plugs had the threaded barrel/stud. I've had this happen on snowmibiles, which really don't appreciate the misfire, and even an old tractor - And you really don't want misfire with a hand-cranked inline 4. Instead of a thread locker or anerobic sealant, try to slightly crush or "cam" the barrel nut so that it takes some effort to screw it into place.

Champions, or NGKs? It seems that they both still use the threaded barrel in some applications.

 

Accell U-Grove plugs

I had just decided to take apart everything and inspect it well. Far as I got was pulling the wire and checking them out.
Then after a few min warm up it was back to normal.

 

Anything that uses those threaded barrels on the ends belongs in the trash. Never had any luck with plugs that used them.

 

I had one older Rotax in a SkiDoo that required them, since the plug terminal/boot didn't use the barrel, but clipped to the threaded portion. I also had a Mercury outboard that required them, since the plug terminals were actually a ring terminal that screwed under the nut instead of clipping on - Same as the tractor, but it was made in 1938.

 

I really don't know.
This is the first time I have ever had this happen.
I use Accell in my cars and NGK in my bikes.
Both have screw off ends.


I like the Accell plugs though.
They perform well and have a long life.

 

You talking about the cars and bikes, or the plugs?

 

Are you being cute???

Maybe we should get together some weekend and tear up our rear-ends.