Thread: Xr2 miss fire

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  1. #1

    Xr2 miss fire

    Still having this issue with no spark on no6 cylinder. So far I swapped the switch boxes same problem same cylinder. Next swapped the wiresame from the no4 coil and no6 coil at the switch box the problem went to no4. Swapped the wires back the Swapped the coils still no fire on no6. Also new stator. Trigger issue? Sn a199697

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    #2
    if the problem follows the wire then wire us bad /do ohm test on wire likely bad connection at terminal ends
    where the grass is green and the girls are pretty

  4. #3
    I made a quick jumper to go from the switch box to the coil on no 6 still same problem

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    #4
    ohm test on trigger
    where the grass is green and the girls are pretty

  6. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #5
    Don't overlook the GROUND for the coil... and when you make a jumper, make certain BOTH ends of the original lead are disconnected.

    Does this engine still have an idle stabilizer installed?


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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  7. #6
    Stabilizer is gone not sure if they set timing or not. I removed the small black ground wire check and cleaned the connectionsame. Still same issue. Also had both ends removed when I haventured the jumper

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    #7
    check trigger yet
    where the grass is green and the girls are pretty

  9. #8
    Have not checked it. Do you have a spec sheet on ohm readings?

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    #9
    1100 - 1400
    where the grass is green and the girls are pretty

  11. #10
    I will check it when I get home. If it was the trigger wouldn't I have more than one cylinder with no spark?

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    #11
    true
    where the grass is green and the girls are pretty

  13. #12
    I got 13.67,14.2 and 11.45 on all three test

  14. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #13
    Usually trigger will affect 2 cylinders when there is a problem in a winding.

    You said that you swapped the wires and swapped the coils. Did you physically remove the coil, and move it to another location, placing the coil from another cylinder in place of the #6 coil (and then still had no spark at the #6 cylinder)?


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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    #14
    test looks good,would check wiring and ccoils closely
    where the grass is green and the girls are pretty

  16. #15
    Yes I swapped the coils and still had no spark on #6. I pulled the small black ground wire and cleaned the ends and where it bolts to the block still same issue. How much power should I see at the lead coming from the switch box? I will make a new ground wire when I get home just to be safe on that end

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    #16
    if you have dva meter at idle 125-175 volts on 400 scale if you have low voltage at sw box terminal on #6 pimary and all others are good sw box is bad
    where the grass is green and the girls are pretty

  18. #17
    I swapped the switch boxes around and still had the same issue. If it was the box I would think the issue would go to #5

  19. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #18
    Not necessarily...

    Problem will be in the switchboxes (ALWAYS replace IN PAIRS), or the trigger. Switchboxes are more likely if it's a SINGLE cylinder down.


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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  20. #19
    Just got time to look at the motor. I got the miss fire solved after 2 new switch boxes. Now I'm trying to set the timing since the module was removed many moons ago and I doubt they set it back up. With all the plugs out I get 17 degrees at idle and 26 at wot. This is after I got tdc and checked the pointer. My question is the screws on the throttle arm. The function of each? Right now my idle is way to high. I know on muffs it will be different than in the water.

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    #20
    set it 4-6 at idle /23 wot
    where the grass is green and the girls are pretty

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