EFIDynoTuning Forum

On the mechanical side are you possibly pulling in oil vapors from leaking valve seals, stuck open PCV valve, or fuel vapors from a stuck open EVAP purge solenoid or other extraneous fuel source? This would be most prevalent under high vacuum.

My other guess on the tuning side would be if the computer is learning closed loop fuel adjustments under decel when the AFRs would be leanest, but don't listen to me I still have a ton to learn. Is your pedal position status going into dashpot on decel? I would imagine but can't say for sure this should tell the ECU not to learn fueling during decel. Perhaps Decipha or anyone with more knowledge than myself can say if I went off on the wrong trail.

decipha wrote: ↑2021 Jun 28, 13:56 I don't recommend iridium plugs.

Is this because copper has better electrical and thermal conductivity than platinum and iridium, or is there more reasons beyond this?