Thread: Bad gas mileage
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Old 12-27-2003, 07:28 PM
Berolina Berolina is offline
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Join Date: Feb 2002
Location: Osoyoos, British Cumbia
Posts: 21
Bad gas mileage

I was thinking O2 sensor until I read that the car has to be warmed up before the O2 sensor activates. Since I have black smoke coming out of the exhaust right from the start, when the engine is still cold and my "economy needle" goes well up even at cold idle, I was wondering which sensors the engine draws information from when running cold.
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1987 420SEL
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