EFS.O

..and tell me what you think.I know that by just looking them is not 100% the right way,but at least you get an idea.For sure i know that i am not running rich,but i the trailing seems a bit lean to me(the top one)....

Regards,

Stathis

RX7WEEE

iTrader: (16)

Seems okay to me.

*shrug*

dubulup

^funny looks lean too mean...all around. Mine are a darker brown...but my car is happier running rich at idle. 11.4-11.7 under boost.

scotty305

iTrader: (2)

Here are some other photos to compare yours against.

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/post-your-spark-plug-photos-here-417119/

-s-

Kento

The only thing you should really be concerned about when looking at your spark plugs is the electrode wear, and any weird deposits (metal flakes, etc.). You cannot tell if your engine is "running lean" by a spark plug unless you do a "plug chop" (running the engine under full throttle for an extended period, then chopping the throttle and shutting down the engine), which is obviously impractical (and dangerous) to do in a car with power steering and assisted brakes, and especially with a forced-induction engine, due to its different fueling characteristics.

The overall coloration of the plug surfaces will be affected by part-throttle operation, where a/f ratios can fluctuate wildly.

Also, FYI, using a spark plug to determine your a/f ratios requires examining the porcelain insulator down inside the plug; the outer metal portions are affected by the heat of the combustion chamber surfaces, and thus will give false readings.

spurvo

My plugs look JUST like that when I swap them. I'd change 'em a bit sooner than you did there to keep it running peppy! (I run ~4000 miles on stock 7's and 9's, stock engine. It just really LIKES fresh plugs, is all...).

EFS.O

Guys,thanks for the replies.It seems that its time to throw more money to the endless pit(wideband).

Regards,

Stathis

scratchjunkie

yea it looks like those plugs have 20-30k miles on them.

EFS.O

They had 8.000 miles....