FiTech EFI system

rednesss said

Can you post your values that you have? I still have a off idle stumble/extreme lean situation. I can be coasting at 45 mph, TPS is 0.0, I tip in to say 5-7% TPS and I go to 20.0 AFR for a half second or longer and it just falls on its face unless I stomp on the gas pedal.

Click to expand...

I still have that too. I'll have to pull up some values and share them.

My stumble comes in only at medium revs (3k or so), with very very very light cruise throttle input. If I just 'ease' into it, say for a hill or wind gust, etc, it will shoot up to 18~20 and stall, then come back. Quite annoying.

I've tried running cruise target AFR of 12.9 to 15, and it's always there to some extent. It seems to be related to the 'tipout' values that are listed in the definitions, but not accessible on my handheld. The 'tipout' reduces fuel input so that the engine doesn't go rich as it digests the fuel off the intake manifold walls - which means if you tip out and then back in, you catch the computer with it's pants down. It's pulling fuel right when you give it a big gulp of air and *boooooooooooog*

I've tried playing with the accel pump settings, and it helps to some degree. But the problem is that once I set the gain on the accel pump high enough to address it, a WOT stab at 3k on the freeway causes my AFR to drop to 10.2 or 10.0 and won't climb back into the 12's until I'm waAAAAAaay beyond legal speeds. I've been meaning to reset my fuel learning and setting the gain higher again to see if I can 'train' it to respond properly and without the lean spike on tip-in, but haven't gotten to that yet. It just drives so nice everywhere else.