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i think i know why my winter mpg stinks so much 200 1991

posted by  weather on  Mon Feb 23 10:27 CST 2009
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last visit: Fri Oct 26 23:16 CST 2012
[RELATED]

winter mileage with near-freezing temp: 19-20mpg on highway. in the summer, 25. that's a 91 LH2.4 stock, tuned up.

i'm convinced that the cause is the airbox pre-heat setup--or rather, the lack thereof. basically, with the preheat assembly missing, the AMM hot wire is cooled more with colder air, and the ECU goes to enrich the mixture. the pre-heat assembly is there to regulate incoming air temperature for better fuel economy in cold weather (flapper goes full hot at 5 degrees C, full cold at 15 degrees C). silly me.

removing the preheat assembly would not affect the florida or california crowd any, but will matter to those who have this thing called winter.

so, any of you flodia/california crowd care to send/sell me your preheat hose, flapper and thermostat?






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