MicroSquirt.com read only forum (Jan.15,2018)

I don't agree with you, it still leans some bins up to 20 points.

When I am in this type of situation tuning a car I make drastic changes in fuel just to try to get a hint of what's going on, If I don't see a change in behaviour I just change it back to what it was.
And with drastic I usually go ...

what lambda do you use?

Try to back of the fuel quite a bit and test it, you may have it so rich the spark energy just isn't enough to ingite the mix and also gives you a wrong afr reading from alot of unburnt fuel.

When I run your log in MLV VE analyzer it changes it quite much in the bins it has values for.

Try to go a bit leaner on the fuel in the affected area and also get new plugs, plugs seem to be short lived when having problem with weak spark which I feel you have problems with.

What lambda do you use?