raiden571

werd, thanx for the info

flyviper69

i concur, def good info. i know what im doing in the morning.lol

lkailburn

wow i learned so much

-Luke

Tom-Guy

No, it didn't. I wasn't dealing with spots, I was dealing with streaks. The plugs looked cherry, it was some wierdass mechanical failure.

Slo_crx1

Streaks I've seen before...usually caused by the spark trailing down the sides of the porcelain and arc'ing across to the well of the plug. The aluminum speckles provides the least path of resistance and the spark arc sometimes melts them.

Slo_crx1

I'm getting pretty proficient at it, hell I'm even pulling plugs out of every motor I can find and looking at them. I went so far today as to pull the plug from my lawn mower and jetted the carb on it. :P I still wish I had a wideband though, it would give me a better point of reference as to what the different afr's look like on the plugs. If nothing else I can tell whether a motor has too much timing, too little timing, and detonation all from a few seconds of staring. Plus with all the lean issues I've been having with my setup lately I think I've probably run at least 12 new sets of plugs through that motor. :P

Tom-Guy

Huh, that may be a possibility.

But, if so, how come the other three plugs looked freaking perfect? And there were no other markings on the aluminum-foulled plug to indicate detonation. Aside from the aluminum laid against the ceramic they looked perfect too.

Slo_crx1

Any black pepper speckles? Those are indications of very mild detonation. The plug itself had no lean appearance to it? What about heat range...excessively hot plugs will detonate as well...what's the ground strap mark look like? Also look for a ring around the tip of the electrode...indicates a timing problem. Of course, it could've been a faulty or clogged injector as well.