Question about 2004 Ford Crown Victoria

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Car is running rough, afetr spark plug change

I recently changed the spark plugs in my 2004 Crown Victoria. The check engine light came on right after. I did a diagnostic on it, and it said "Cylinder 3 Misfire" I replaced the ignition coil on the #3 cylinder, and now the check engine light wont come on at all, but the car is still running rough. It seems to be missing, and not running smooth. The fuel line popped off in the process, so I dont know if it is a injector issue, or a compression issue on that cylinder. Any ideas will help!

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  • wendylovesfr Apr 13, 2009


  • wendylovesfr Apr 13, 2009

    There are no plug wires, just coil packs, and all wires are correctly attatched to those. The RPM's do change when I remove the cylinder 3 wire that attatches to coil pack, so I think all is good there also. I have also removed plugs and swapped things out, and the exact same problem remains. I am really starting to think that it may be one of the injectors.

  • spittle5dj May 11, 2010

    to check the cylinder do a compression check. other than that think basics. swap injectors / spark plugs/ leads to another cylinder to move the problem

  • Mike Butler
    Mike Butler May 11, 2010

    Duh sorry about wires question, got years mixed up with another one I've been helping. Fuel line popped off, makes me lean toward something happened there that may be reducing fuel flow, which in turn would make you think bad injector perhaps. Injector connection, vacuum line, anything in that area that you may have disturbed when doing the job. I'm just throwing stuff out there now, just because it doesn't make sense, as I'm sure you've said already. Any chance dirt got in fuel line when putting it back together? Any "O" rings on fuel line connection that may have wedged in wrong? Now curiosity is killing me.

  • Mike Butler
    Mike Butler May 11, 2010

    Tried pulling plug wire(s) with insulated pliers to see if rpm's change?
    No chance any wires got crossed eh? Sorry, had to ask.
    Swapped plugs, wires, with bad cylinder to see if problem moves or remains?

  • Mike Butler
    Mike Butler May 11, 2010

    Did it run rough before plug change?

  • Anonymous Mar 27, 2014

    WHEN I PRESS THE GAS PEDAL GOIN UP check engine light pops on



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Make sure no fuel is down in the spark plug ports it will short out the spark

Posted on Apr 15, 2009


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