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Old 09-19-2012, 04:18 PM   #6 (permalink)
ever_green
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Join Date: May 2011
Location: Toronto
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gueff - '19 Mercedes Benz A250 4MATIC AMG
90 day: 30.55 mpg (US)
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Quote:
Originally Posted by serialk11r View Post
That's actually pretty interesting, I think a lot of cars run closed loop at high load low rpm, but they have wideband sensors and definitely enrich the mix. Never heard of no enrichment at WOT...
correct my car stays in closed loop under 4000rpm at wot. however a/f enriches already at 3500rpm with lots of throttle. low rpms (below 3k) are almost always in the 14s from what i have seen no matter how much throttle/load. only time i have seen it run rich below 3k is during cold starts at about 13.5-13.8. during these cold starts my fuel flow rate is 1.3 gallons per hour. this condition at cold start is giving me a major headache because it ruins my overall mileage.
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