Quote:
Originally Posted by JohnnyGrey
An ECU in closed loop mode will maintain a 14.7:1 ratio regardless of how clogged the air filter is (short of total blockage). Whether your throttle plate or a dirty filter is providing manifold vacuum, your engine does not care, and is burning at 14.7:1 regardless.
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Incorrect. The car will ATTEMPT to get to the ratio desired in the AF table for that set of conditions. MOST of the time it is running rich except for cruise plateaus on the AF table.
Very rarely does your car run at 14.7:1.. at least from the 30 or so ECM's I have been in are set for. But then I only program GM cars. It may be different for imports. But even then I cant see how they could ever keeep the AF near that all the time. you always are running rich on acceleration.