Quote:
Originally Posted by reeves
I'm no expert either.. but on my previous car, I had a standalone EMS put on it.. The tuner told me it was normal for AFR to go up to 20+ when you let your foot off the gas.. it's suppose to save gas that way. And because you essentially have no load on the engine, being that lean won't hurt the engine.
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That's because when you're off the throttle you're not running lean, there's no fuel being injected at all. There's no combustion going on so all your engine is doing is pumping air through it, which is why your AFR is actually much higher than 20, I guess 20 is just the limitations of the sensor. AFR values are only useful when on the throttle.