Distributor

Discussion in 'Test' started by 49tucci, Oct 9, 2019.

  1. 49tucci

    49tucci New Member

    4
    Jun 30, 2019
    1997 33 searay amberjack
    7.4 mercruiser
    distributors on 7.4 MerCruiser engines 1997 seems to be an issue
    Replace distributors on both engines
     
  2. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    Welcome to CSR. Was that just a comment, or do you have a question?
     
  3. 49tucci

    49tucci New Member

    4
    Jun 30, 2019
    1997 33 searay amberjack
    7.4 mercruiser
    I have replaced two distributors with on two different engines within two months is any one having any problems with them.
     
  4. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    which diz. what problem ?
     
  5. 49tucci

    49tucci New Member

    4
    Jun 30, 2019
    1997 33 searay amberjack
    7.4 mercruiser
    Engine won’t start distributor not letting gas to flow to ejectors. Baffled mechanics
     
  6. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    I think you got the explanation wrong, that's not how it works. But, whatever other info you have, post it
     
    techmitch likes this.
  7. 49tucci

    49tucci New Member

    4
    Jun 30, 2019
    1997 33 searay amberjack
    7.4 mercruiser
    My explanation is correct, electronically the distributor is not allowing gas to flow to ejectors . Mechanic said he has replaced four this season.
     
  8. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Yea, that's not how it works.
     
  9. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Yea, that's not how it works.
     
  10. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    you may need to replace the IC module, not the dist. TH module supplies the pulse to the ecm to send fuel to the injectors and operate them
     
  11. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    DISTRIBUTOR REFERENCE (DIST REF)
    GM refers to this as Ignition Control (IC). The distributor reference (engine speed signal)
    is supplied to the ECM by way of the “Dist Ref Hi” line from the High Energy Ignition (HEI).
    This pulse counter type input creates the timing signal for the pulsing of the fuel injectors,
    as well as the Ignition Control (IC) functions. This signal is used for a number of control and
    testing functions within the ECM.
     
  12. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION SERVICE MANUAL NUMBER 23
    Page 5B-26 90-861326--1 MARCH 1999
    The ECM controls the primary current going to the ignition coil. It sends a voltage signal to
    the IC module that sends a voltage signal to the ignition coil. This signal will trigger the coil
    creating secondary spark to be produced. The secondary spark is sent to the distributor and
    then to the correct cylinder by high tension leads.
    The Ignition Control (IC) module maintains the base ignition timing. It also has a 27-degree
    spark advance built into it in case there is a Code for an IC operation failure detected while
    the engine is running. The engine will continue to run but at reduced performance.
    J1-10
    J2-10
    J1-24
    76082
    ECM
    A B
    J1-20
    J1-4
    J1-5
    450 BLK
    B A
    B A
    J1-3
    902
    RED
    423 WHT
    121 WHT
    424 TAN/BLK
    430 PUR/WHT
    453 RED/BLK
    BRN
    PNK
    450 BLK
    450 BLK
    BLK = BLACK
    BLU = BLUE
    BRN = BROWN
    GRY = GRAY
    GRN = GREEN
    ORN = ORANGE
    PNK = PINK
    PUR = PURPLE
    RED = RED
    TAN = TAN
    WHT = WHITE
    YEL = YELLOW
    LIT = LIGHT
    DRK = DARK
    a
    b
    c
    d
    e
    f
    g
    h
    i
    k j
    l
    m
    n
    o
    Typical System Shown
    a - ECM Ground
    b - ECM Ground
    c - ECM Ground
    d - Ignition Control
    e - Distributor Reference HIGH
    f - Bypass
    g - Distributor Reference LOW
    h - To Tachometer
    i - 2-Way Black Connector
    j - 2-Way Gray Connector
    k - From Ignition Relay
    l - 2-Way Coil Jumper Harness
    m - IC Module
    n - 8 Cylinder Distributor
    o - Pick-up Coi
     
  13. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    Up next........"my navigation lights need to be replaced because the engines won't start.":)
     
    Almightys likes this.

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