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1998 Ford Expedition Question: Changed out sparkplugs,wires,coil pack and code PO303 came up again.Car hesitate



felsogud, 4.6L V8, Hughesville, MD, July 11, 2013, 17:59

Hesitate will accelerating and check engine light comes on and go off.what could be the problem.

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  • Answer #1

    Real Auto Haus (111 Answers) , Westmont, IL - (630) 361-6756
    TristanReal July 11, 2013, 18:49

    Have it diagnosed by a reputable repair shop. Misfires can get costly with guessing game. Possible ignition problem, Scoping it should further shed some light on ignition faults. Check fuel system also, a failed injector cyl. 3 can be the cause. Or it can be mechanical, cylinder compression test and leakage test can be performed to check mechanical integrity.

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    felsogud, July 12, 2013, 09:02

    Thanks for the feedback,will look in to it.

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