Question about 2003 Lincoln Navigator

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2001 Navigator shakes and misfires.replaced coils 1-2-3-7 and plugs .no change

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  • stanley stevens
    stanley stevens Jan 02, 2009

    coils and plugs 1-2-3-7, i am completely at a loss
    any help is really appreciated

  • stanley stevens
    stanley stevens Jan 02, 2009

    scan said misfire and bad coils on 1-2-3-7 so the mechanic that did the scan said he should replace the plus on those coil packs as well.After paying him and spending 312 dollars on parts it still shakes and runs very poorly. I appreciate your helping with this. I am at a loss and almost broke

  • stanley stevens
    stanley stevens Jan 02, 2009

    The misfire is constant.It will not drive over 20 mph. Also after the 4 coils were replaced he did another scan and it said on only # 1 was bad.again we put on another coil and same reading(#1) but there has been no difference it the car.My cousin is an army mechanic and i spoke to him last night before he left for deployment and he also said it was probably a vacuum leak as you have suggested.I will be checking for leaks again in a few minutes

  • stanley stevens
    stanley stevens Jan 02, 2009

    Thanks for all your help.I do not want to occupy all your time but please feel free to continue to send anything you believe might be helpful.I am trying all that you have said this evening
    again thank you and Happy New year

  • yadayada
    yadayada May 11, 2010

    How about the coils and the fuel injectors? how is the compression? I think warrants a trip to the dealer, they can quickly diagnose this issue.


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When you scan the engine what do you get for codes?

Posted on Jan 02, 2009

  • 1 more comment 
  • paul erickson
    paul erickson Jan 02, 2009


    lets start from the top

    why did you replace the coils and plugs on 1-2-3-7 ??

    what did the other spark plugs look like?

  • paul erickson
    paul erickson Jan 02, 2009

    i dont think your mechanic treated poorly you usualy only have one go bad at a time. i dont think any of your coils were bad.

    there should of been more dianostic work done.

    you need to have your fuel pressure checked you need to check vaccume leaks

    and is the misfire constant?

    or does it go away when you rev it up

  • paul erickson
    paul erickson Jan 02, 2009

    the fuel pressure should be checked and extra attention to the exaust to make sure your cat hasnt plugged.


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