Question about 2006 Ford Expedition

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Engine making a slight rattling or pinging noise

Oil has been changed with Synthetic oil. Put treatment in crankcase as well as in the gas tank. Noise is still there. What can it be and how can I fix it.

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There are several things that could cause this, Oxygen sensor, egr valve, or could be anti-knock sensor.

Posted on Jul 16, 2013

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I would try octane boost or 91 grade or better gasoline

Posted on Jul 16, 2013

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