[cycleguy]

Are there any cars out there, besides Civic Vx cars, running a lean burn mode? Has anyone on this forum attempted creating their own lean burn hack?

I was thinking about this and feel I could make a simple low-engine-load lean burn on my 3-cyl 1994 Geo Metro. I think it could be as simple as just monitoring the fuel injector pulse widths and the manifold vacuum pressure. Then, when the vacuum pressure suggests low engine load the fuel injector pulses could be shortened by some percentage. The trick, I guess, would be sending the fuel injector pulses into a an input on a micro-controller and duplicating them on an output without much delay. This way, the output pulses could be truncated when wanting to run lean. Because the Metro only uses one TBI fuel injector this would be a bit easier than other vehicles with multi-port fuel injection (though I believe it should be possible for all fuel injected vehicles).

Okay - Does the above make any sense? Please help me understand if I am completely nuts or if I might be onto something. Has another person around here attempted something of this nature?

Let me know what you think - I just bought a cheap hobby oscilloscope and I plan to play around a bit with this concept over the next few weeks. BTW - I will probably use an Arduino Mega or Uno for this since I have a few laying around.