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1999 Mercury Mountaineer Question: mileage sudden drop



gdruga, 5.0L V8, Allison Park, PA, June 25, 2009, 15:41

check engine light on and code indicates lean burn. Sudden drop in mileage per gallon from 15 to 10. what could the problem be. The mechanics here are baffled.

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  • Answer #1

    June 26, 2009, 12:35

    Can you post the codes that are being stored in the engine control module?

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