Question about 2000 Mercury Grand Marquis

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A few months ago car was runniung rough knew it needed plugs and wires so i changed them. that didnt help any so after looking under the hood i noticed intake was leaking water in the front and back of the intake on the passenger side. got it replaced and car ran ok for a day or two then it started the missfiring again. basically i've been changing coils and plugs almost every other week because car scanners at different places keep showing a missfire. i changed the upper O2 sensors today and still having same problem

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  • cruz aguilar Mar 14, 2011

    i'll look into getting the test done and as soon as i can get the codes i'll send them to you. thanks.



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You need to get a coolant system and cylinder leakage test done, you may have an internal problem with the engine. Once this is done it will remove that possibility. Next if that comes back ok then start to look at the ignition control circuits, but because you have replaced most of the main components of this area which the fault code indicates it is tending to lead to coolant getting into the engine.
So have this done and get back to me and I can give you more information on what to do. The fault codes you have been getting can you tell me them?
Let me know what you find.

Posted on Mar 14, 2011

  • Jason Maurirere
    Jason Maurirere Mar 14, 2011

    Not a problem, I wait for your reply.



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