My 02 gauge has been erratic lately, and has been showing off the scale readings, more than 18:0 to 1 - under WOT.

At this point I'm pretty sure it is the sensor, which I'm going to try to clean or certainly replace.

Wanting to know if if that was anywhere near correct, like, am I about to melt the pistons, I did a WOT shutdown after about 4 seconds.

These are the plugs.

Any comments? By the sooty layers around the base ring, I'm thinking it's running rich? I wasn't expecting that, I assumed if anything it would be lean.

The first two photos are cylinder 4, the second cylinder 2. Unfortunately, the camera didn't focus on the top of the plug, but more the middle and my hand. At least I know for next time!