Injector leak/ stuck open
 

Alright its safe to assume that my injector has aleak or is stuck open if I set the primary 850cc pulse width to -.24m/s and still get a reading of no higher then 12 afr, where as a while ago this would have produced a afr of around 14-15 afr.

Still have your air pump?

NO.....Nor have i for about a year or 2 now. A whiel ago refers to about 1.5 months back or so.

previously when i was using my remapped ECU and my afr less than 9.... when i upgrade to my PFC, it's 11.
mine is even worse.

I could never get my afrs above 12 without my air pump, which is why I'm putting it back on.

i believe an air-pump does not help whatever the combustion is doing.
air pump only helped to dilute the air fuel that is coming out from the exhaust port from the engine block. if measure the air fuel before the air pump is pushing air into the exhaust, the air fuel will still be the same RICH :)

just my 2 cents.

it pumps air into to uim to add air