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    Engine Pinging

    I have a 2002, Ford Ranger 4x4 Off Road XLT with a 4.0 V6 with 36,000 miles. I hear a pinging sound when I accelerate up an incline. The Ford mechanic told me not to worry, that it was common in this type of engine. He further said that this is a sign that I am getting optimal gas mileage...
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