I ate that! Tasted nice too...

Didn't get rid of the bad taste the wrecked engine has left me....

I like the sound of your explanation Dojj - makes good sense, and sounds feasible. Wish I had set up the date logging part of the wideband - would have been interesting to see exactly what the AFRs were up to, right up to and just beyond the melting.

I'm sure I was watching 11.4:1 at the precise moment I noticed the problem....

Si