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Okay, so it seems I would have to look at (and mask) the readings from the O2 sensor as well - that makes sense.
I see that there are suggestions of custom engine tuners that are capable of providing lean burn modes, which is cool but I just don't think I can justify the amount of money it will cost. I would really like to come up with a small, simple solution that costs me under $150. After all, I have a completely gutted 94 metro that I probably couldn't sell for more than $1000 on a good day. I like the idea of piggybacking on the stock ecm under the dash. For now, I could make a relatively simple data logger to compare manifold vacuum pressure, injector pulse width, and 02 sensor voltage.
The Megasquirt looks like a nice option for doing this, but it seems they start at about $250. I am afraid there will be a lot of additional costs with this method. Has anyone on here used one?
I don't expect this project to yield a super big fuel economy gain so I don't want to spend too much time/money working on it.
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