Question about 1995 Lincoln Mark VIII

5 Answers

NUMBER 5 CYLINDER IS DEAD ON MY 1995 LINCOLN MARK VIII

THE ENGINE IS RUNNING VERY ROUGH. I HAVE TRACED IT TO CYLINER #5. WHEN I PULL THE SPARK PLUG WIRE OFF THE COIL, THE ENGINE DOESN'T RUN ANY DIFFERENT. ALL THE OTHER CYLINDERS CAUSE A DRASTIC CHANGE. I HAVE REPLACED THE SPARK PLUGS, IGNITION COIL, FUEL INJECTOR, AND WIRES FOR THAT CYLINDER. DONE A COMPRESSION TEST ALSO. (190PSI) STILL NO POWER FROM #5. WHAT COULD POSSIBLY BE CAUSING THIS PROBLEM?

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  • chad306 Dec 21, 2008

    I HAVE TESTED THE CONNECTION TO THE INJECTOR & REPLACED THE INJECTOR ITSELF.

  • chad306 Dec 21, 2008

    I HAVE ALSO ATTACHED A CODE READER TO THE CAR AND THERE ARE NO FAULT CODES UNTIL I GET TO THE CYLINDER OUTPUT TEST WHICH CUTS THE FUEL TO EACH CYLINDER ONE AT A TIME AND THEN TELLS WHICH CYLINDER IS WEAKEST. THE TESTER STATES THERE IS A PROBLEM WITH CYLINDER 5.

  • chad306 Dec 21, 2008

    THE PLUG TO THE COIL IS CLEAN. CHECK FOR A LOOSE GROUND WIRE TO WHAT? THE COIL, OR IN GENERAL?

  • chad306 Dec 21, 2008

    IF THE VALVES WERE NOT CLOSING COMPLETELY I WOULDN'T HAVE 190PSI COMPRESSION ON THAT CYLINDER WOULD I?

  • chad306 Dec 21, 2008

    IF THE RING SEAL WAS BAD I WOULDN'T HAVE 190PSI COMPRESSION WOULD I?

  • chad306 Dec 21, 2008

    THANK YOU VERY MUCH FOR THE ADVICE. THE SPARK PLUG WAS WET WHEN I PULLED IT OUT, SO I KNEW IT HAD TO BE SPARK. I WAS GETTING SPARK TO THE PLUG THOUGH. I DECIDED TO SWITCH THE #5 & #6 SPARK PLUG WIRES TO SEE IF IT COULD BE THE WIRE ANYWAY. SURE ENOUGH #6 CYLINDER BECAME DEAD & #5 WAS AS GOOD AS NEW. CAN'T BELIEVE I WENT THROUGH ALL THIS BECAUSE A NEW PLUG WIRE WAS DEFECTIVE.

    THANKS AGAIN.
    CHAD

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Hi and welcome to FixYa,

Initially, a couple of ideas you may want to explore/try:

  • remove spark plug of #5;
  • if wet with fuel, then injector is good but no spark;
  • if dry, either it is firing or injector is bad;
  • since injector is new, then should be wet with fuel;
  • if yes, then coil is not getting trigger to fire;
  • if no, then injector is not getting trigger to spray;
  • either which points to engine management computer;
  • a test on injector trigger, on the injector itself, 1 wire would IGN +12, as long as IGN key is ON, there would be 12VDC measured, the other wire should be pulsating when cranking;
  • if yes, then ECM is triggering injector;
  • if not, then ECM is not or wire is detached/loosed from ECM.
Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 21, 2008

  • Louie  Role
    Louie Role Dec 21, 2008

    Glad to be of assistance and appreciate the rating too.

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This is Most lilely a bad ring seal and will need replaced!

Posted on Dec 21, 2008

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  • Expert
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Welcome-

there might be a problem with the valves on that cylinder. they might be carboned up to the point that it stays open just a bet so that you have problems.

thanks tom

Posted on Dec 21, 2008

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  • Expert
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Check your plug going to your ignition coil should be 3 pins maybe your plug is worn,or filled with too much grease and dirt. Some electrnic parts cleaner. But I would look for a loose ground wire first usually green.

Posted on Dec 21, 2008

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  • Lincoln Master
  • 2,039 Answers

If our compression good new plug coil ,plug wire the only thing left is the injector wire connector or injector itself that no good

Posted on Dec 21, 2008

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