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Part po351 - 1997 Ford Expedition

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Ignition coil A primary or secondary circuit malfunction

check the spark plugs. see if one is bad. if they are good replace coil pack with a good one and see if it works maybe just one , coil is bad

Posted on Sep 16, 2010

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It's probably the 4th which is all the way in the back on the left side when you are standing in front of the vehicle facing the engine. There is a water line that runs above that cylinder and drips condensation into it allowing for problems. It's best to replace the plugs AND the (coil pack--which run $60 each).

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