In the above video, the EFIE setting is "mild" when it is on. I am trying to add a small fuel trim that still allows for moderate acceleration.
Here is my interpretation of what I am seeing with the EFIE. When the EFIE is on, the A/F ratio creeps up to 14.7 + deltaT. The deltaT is a function of how high I set the EFIE. But, I also have a second post-cat 02 sensor that is used to manage emissions. Because the second 02 sensor is telling the ECU/PCM that the car exhaust is running lean, I think the ECU/PCM tries to resolve the difference by jumping back to 14.7, and then creeping up again. Therefore, I think the result of the EFIE is that instead of floating close around a "narrow ratio" of :
14.7 +- .2
It is now floating around the deltaT with a much wider span :
(14.7+deltaT) +- deltaT
What this means for my EFIE is that I still go back to 14.7, but I spend alot of time "floating up" above 14.7 before going back down.
- Since the ScanGauge does not use the short/long term fuel trims, I don't think it is registering the effect.
- I don't like the teeny-tiny screw. It would be nicer if it had something I could tap into. If the screw was on the opposite side, at least it would be easier to package with a hole for inserting a small screwdriver.
- It's output-bias-voltage is temperature sensitive. I wouldn't mind this, except for the fact that I didn't find out until after I bought it. That detail should be on the website. I intend to package it in insulation.
- I may make it a "no load" option for now. If I tap into the TPS signal, I can make it so that it will only be on when the TPS is zero, and off when I accelerate. That way, the engine will simulate "diesel going lean" under idle/no load conditions.