Here is from vol.6, no.4, p.1 of the journal nemo linked above:
Quote:
Fuel trim can also be expressed as
either a positive (+) or negative (-)
percentage. The percentage reading
represents the difference either above or
below the anticipated amount. So a short
term fuel trim reading of +20 percent
indicates 20 percent more fuel had to be
added to achieve the proper air-fuel mixture.
A -20 percent short term fuel trim indicates
that fuel had to be removed by shortening
the injector pulse width to achieve the proper
air-fuel mixture.
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So if my long term fuel trim is +0.78 or +1.56, I am running rich. Darn. Need to figure that out. I'm leaving a margin of FE on the table.