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  1. #1

    Default Mercury 90 elpt 4 stroke 2000 yr.

    Motor sat for who no's how long, rebuilt carbs. Haven't synced yet with vacuum gauges (vac-mate) . Motor is waste fire , 2 coils for 4 cylinders.
    Charge stator is good with dva, reg/rect. Is good. We don't see very many of these motors. Crank position sensors ( port w/r wire , starboard w/bk)
    I'm getting the 2.3-4.5 volts from w/bk but not w/r crank sensor. Manual says if shift interrupt switch is bad you lose fire on 1-4 cylinders, I've tested
    **** interrupt for the 75-90 HP which is different from the 115 and higher HP
    Button in continuity, out none. Shift interrupt switch has 2 w/r wires to one side and black to other. One w/r goes to ECM other w/r straight to port side crank position sensor. Through connectors. Top plug to ecm b/o has 165-180 volts with dva that goes to top coil 1-4 cyl. Bk/w coming out of that ecm
    has 0 volts ( going to 2-3 coil) if I unplug bk wire from shift interrupt switch,
    Then I have voltage at BK/w , but not what's called for. Only about 20 volts.
    I have test stator /crank position sensors , and a ecm that is good. And no change, I have the 4.5-5.6 volts from TPS. Thermoelectric on the carbs , ohm out good. Has anyone seen this? What am I missing? Please and help would be appreciated. Being we are not a Mercury dealer , Mercury want help. THANKS.

  2. #2
    Join Date
    Nov 2011
    Location
    tennessee
    Posts
    5,416

    Default Re: Mercury 90 elpt 4 stroke 2000 yr.

    Which cylinder ya got problem with?
    Pappys Sales and Service
    Owner and Factory Certified Technician
    Former racer KDBA (Kentucky Drag Boat Association)

  3. #3
    Join Date
    Sep 2010
    Posts
    24,022

    Default Re: Mercury 90 elpt 4 stroke 2000 yr.

    Serial # of this motor ?

  4. #4

    Default Re: Mercury 90 elpt 4 stroke 2000 yr.

    Ot102415 number 2-3 coil, but not a coil problem, w/r doesn't have low voltage from pulser crank position sensor On port side

  5. #5

    Default Re: Mercury 90 elpt 4 stroke 2000 yr.

    Update, guys, fixed it , 3 weeks ago, the 4 carbs all have a 3/32 -5-32 , vent hose coming from each carb. That connects to a 1/8-1/4 hose that goes down to bottom of cowling to vent.
    Guess what dirt dobber wouldn't let carbs vent. Bam. I thought all carb vents went in side cowling, individual. No

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