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99 crown vic misfiring

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  • 99 crown vic misfiring

    i have a 99 crown vic p71 30k miles and it just started to really misfire on 4 cylinders and my mechanic replaced some of the wires but now it really kicks and jerks the car while driving as if it was cuttin out and still misfiring. what more needs to be changed ? i hope someone has had this experience and can help me.

  • #2
    Re: 99 crown vic misfiring

    Rule out base engine problems, rule out fuel problems, and then look at ignition problems (be sure to rule out coil primary circuit issues).

    i

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    • #3
      Re: 99 crown vic misfiring

      does anyone know where and how to reset the fuel pump switch?

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      • #4
        Re: 99 crown vic misfiring

        Originally posted by blackbox View Post
        i have a 99 crown vic p71 30k miles and it just started to really misfire on 4 cylinders and my mechanic replaced some of the wires but now it really kicks and jerks the car while driving as if it was cuttin out and still misfiring. what more needs to be changed ? i hope someone has had this experience and can help me.
        Did you pull any plugs out and look at them?

        Just curious how do you know it is 4 cylinders misfiring ? Are they the same 4 all the time?

        On a scope they should be able to see the voltage required to fire the plugs and wheter or not the plugs are getting the correct voltage ?

        Did he clean the injectors?

        I think you have a fuel pressure issue does the mechanic know how to look for this?

        Any thought as to why he replaced the spark plug cables?

        Coils on the plugs repalced them a couple of timesfor this issue
        Last edited by cquirk; 12-09-2009, 09:38 PM.

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        • #5
          Re: 99 crown vic misfiring

          Originally posted by blackbox View Post
          does anyone know where and how to reset the fuel pump switch?
          If you're talking about the inertia switch, it is in the trunk, I think on the right side -- same place as the gasoline model.

          larrycng
          Last edited by larrycng; 12-08-2009, 01:37 PM.

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          • #6
            Re: 99 crown vic misfiring

            i'm no expert, but maybe you're sparkplugs are loose and are about to blow-out. this happened to my cng ford truck, but it is a problem that is common with all ford engines-- not just cng.

            if this is the case, then the ONLY, i mean the ONLY, people you want to contact are at blownoutsparkplug.com I thought my truck was toast but these guys fixed it and guarantee the work! just check out the testimonials on their website-- they were an absolute pleasure to deal with.

            Only charged me $1100 to fix my blown out plug plus redo all 7 other caps with the ones they designed that wont blow out - guaranteed. best other quote was at least $3500, possibly more, with no promise that it would even be fixed. Then i had them redo all caps (plugs w/e i don't know what they're called) on my gas P71 so its plugs wont ever blow for $400.

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            • #7
              Re: 99 crown vic misfiring

              I had some misfire issues on my '03 Crown Vic at about 30K and 60K miles. Major hesitation and it would trigger the check engine light. I eventually replaced all the coils with the aftermarket cheapies and no problem so far at 120K.

              After the first issue, while under warranty, I was amazed to watch a Ford mechanic connect his palm pilot to the OBD2 connector and watch the firing sequnece as if it were an o-scope. He identified the bad coil in seconds. Wish I had the time to figure out how to do that.

              Does anyone have a good lead on coils that cost less than $70 yet seem reliable?

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              • #8
                Re: 99 crown vic misfiring

                Originally posted by gastronaut View Post
                I had some misfire issues on my '03 Crown Vic at about 30K and 60K miles. Major hesitation and it would trigger the check engine light. I eventually replaced all the coils with the aftermarket cheapies and no problem so far at 120K.

                Does anyone have a good lead on coils that cost less than $70 yet seem reliable?

                I agree with gastronaut, Very common problem with all Ford V8's, most likely its just a few ignition coils, but you might as well replace all 8, to prevent any further problems. Its very easy to do yourself, instructions can be found online or in haynes repair manual. You might as well replace the spark plugs while your at it, if they have not been done. If you have been driving for awhile with the CEL on, don't panic if it does not go out immediately after repairs. sometimes it takes a number of ignition cycles for the computers to reset. ---You say your mechanic replaced the spark plug wires? --you may want to get a diffrent mechanic, as the '99 crown vic does not have plug wires!!

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                • #9
                  Re: 99 crown vic misfiring

                  the ignition coils that you need to replace are also called COP or "Coil on Plug" because that is exactly what it is. buy a decent brand on the net to save some $$. (Experience with '99 Crown Vic, '99 town car, '04 expedition, and '00 grand marquis.) All ran smoother than a baby's but after replacing COP's

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                  • #10
                    Re: 99 crown vic misfiring

                    great news i finally got tired of my mechanic and ordered 8 cop's and replaced them myself and man does it run nice now. paid $75 including shipping.

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                    • #11
                      Re: 99 crown vic misfiring

                      Congratualtions nothing more satisfying then fixing it your self at a low cost

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