Question about 1998 Ford Explorer

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Missing problem I have a 98 ford explorer 127K miles. It is missing while idling and throughout driving range. Check engine light is on and code P0304. What should I check first?

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  • Anonymous Jun 27, 2008

    air conditioning control vavail 1998 ford explore l

  • acewebb Oct 14, 2008

    I have a 1998 ford explorer missing on two cylinders misses realy bad if you let it idle under 2k rpms. I have replaced the coil pack plugs and wires and it slill misses

  • mikezampini Jan 02, 2009

    If anyone can help with this it would be greatly appreciated. I have a 1998
    Explorer with the 4.0 SOHC and about 98K miles. Everything was fine when I left
    it for about two weeks in the driveway. When I came back the MIL was on, running
    rough and a moderate to loud ticking noise. It was a great massage on the way to
    hockey practice. When I returned I read codes P0304, P0305 and P0306 misfire on
    cylinders 4, 5, 6 respectively. The MIL is now blinking. After resetting the
    codes I get the following error code, P0300 which is the error code for random /
    multiple Cylinder missing. The spectrum of solutions range from replacing spark
    plugs to replace the engine, yikes. Replacing the engine will cost more then the
    value of the car. Thanks in advance for your help and advice. What a great way to start 2009!

    The freeze frame data is below:

    1 Status – Closed loop … Normal
    Calculated load – 32.9%
    Coolant Temp – 183 F.
    Short Term Fuel Trim Bank 1 – 2.34% Rich(+)
    Long Term
    Fuel Trim Band 1 – 24.22% Rich (+)
    Short Term Fuel Trim Bank 2 –
    2.34% Rich(+)
    Long Term Fuel Trim Band 2 – 18.75 % Rich (-)
    Engine Speed – 1314.75 RPM.



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Check the wire pigtail that plugs into the coil pack. The plastic insulation around the four wires become hard and brittle, this can cause shorting and cross fires. Carefully pull the protective cover back to expose the four wires that go into the plug, check visually then bent the wires to see if they are flexible. If they are flexible and not brittle it is something else. Check out this link for detailed information and tests.

Posted on Jan 29, 2012

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I had the same problem on my was the injectors....3 of them....cost about 450 with parts and labor.

Posted on Dec 28, 2008

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  • Ford Master
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300 and up engine misfired the spark is not going to the spark plug bad plug wire you first do a tune up 99% of time you gonna fix it good luck pierre

Posted on Jun 26, 2008

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