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4.3 won't fire after oil change

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  • 4.3 won't fire after oil change

    I'm in the middle of winterizing my 2000 4.3, it started fine to warm up on the muffs, sucked the oil out through the dip stick, replaced filter, put new oil in and went to start it ..it just cranks and wont fire.

    Oil pressure switch is connected, I see pressure climb when cranking. Fuel pump turns on and pumping throttle squirts into carb, I even tried putting some fuel into the carb. The big red breaker seems to be fine, I can't press it in. Throttle safety switch is not triggered.

    No fire attempt at all, just cranks.

    Not sure what I might have knocked in the engine bay while doing the oil change that could be causing this.

    It seems like it's not getting spark, I'm not quite sure how to safely test for spark on these.


  • #2
    Throttle safety switch is not triggered.
    Are you sure the lanyard is connected properly? Sometimes they look right but aren't.
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    • #3
      Originally posted by GA_Boater View Post

      Are you sure the lanyard is connected properly? Sometimes they look right but aren't.
      Yes 100% it's flipped to "RUN"

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      • #4
        Have you checked for spark?

        Flip the switch a few times.
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        Please, no PM's (Private Messages) regarding boat/engine problems.
        That is what the forums are for.
        Only forum/moderator issues will be answered in PM's.

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        • #5
          Originally posted by GA_Boater View Post
          Have you checked for spark?

          Flip the switch a few times.

          Feel a little silly but whats the proper way to test for spark on these. I'm used to small engines where you just pull the plug out and ground it while cranking. I don't have a spark tester of any kind.

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          • #6
            How about a serial number

            Use a voltmeter and check for 12V at the coil + side purple wire
            94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
            95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
            07 Seadoo GTX
            Merc Adults Only VP Adults Only
            G-Dad always said "First Liar doesn't stand a chance"

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            • #7
              You can check a spark on a plug by taking spark plug out and when your buddy is cranking the engine you hold plug with attached wire in about 3 to 4mm away from the block. The spark, if it is there will be visible if the coil produces the spark
              1998 Ebbtide 210 Campione, Mercruiser 5.0 V8, 1993 Larsen Sei 200 BR, Mercruiser 5.0 V8 1990 Bayliner 2050, Mercruiser 3.0LX 1984 Mercedes, OMC 3.8 V.6

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              • #8
                Shifter in N?
                1988 Four Winns 200 Horizon
                4.3 OMC Cobra

                98 Jeep Grand Cherokee 4.0 Selectrac
                07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                "While air doesn't freeze....rust never sleeps"

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                • #9
                  Originally posted by littleape View Post
                  ... my 2000 4.3, ...
                  Carbed or EFI?
                  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                  The world takes on a whole new perspective when viewed from 100’ below.
                  1972 Bertram ‘Bahia Mar’ 20
                  2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                  (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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                  • #10
                    pumping throttle squirts into carb

                    I see pressure climb when cranking
                    I first post
                    Last edited by achris; November 11th, 2019, 12:08 PM. Reason: fix quote
                    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                    07 Seadoo GTX
                    Merc Adults Only VP Adults Only
                    G-Dad always said "First Liar doesn't stand a chance"

                    Comment


                    • #11
                      pumping throttle squirts into carb
                      I see pressure climb when cranking
                      Originally posted by AllDodge View Post
                      I first post
                      Yep.

                      (In my defense, I had just flown halfway round the world and had minimal sleep. )
                      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                      The world takes on a whole new perspective when viewed from 100’ below.
                      1972 Bertram ‘Bahia Mar’ 20
                      2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                      (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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                      • #12
                        Early blast of cold is preventing me from trying anything until this weekend when temperatures go back up above freezing.

                        Motors drained of water so just need the weather to cooperate.


                        Someone asked for serial#: L662063

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                        • #13
                          I'm seeing TBV ignition, so looking for power to the coil. I'm guessing, but think its lack of voltage
                          94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                          95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                          07 Seadoo GTX
                          Merc Adults Only VP Adults Only
                          G-Dad always said "First Liar doesn't stand a chance"

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                          • #14
                            I AM ASSUMING THAT YOU HAVE A OIL SWITCH THAT SUPPLIES 12 VOLTS TO ELECTRIC FULE PUMP. They are a pain but will save your butt. Figure out how to by-pass an supply 12 vts directly to fuel pump. I believe that you can jump wires at switch. You may have dislodge a corroded connector at switch? Get your volt meter or test light out. You will need them!

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                            • #15
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                              It doesn't work that way. The pump power is from the key until the oil pressure builds after the motor starts, then the oil pressure switch powers the pump.

                              If it was the oil pressure switch, the motor would start and then die shortly after the key is released when the float bowl empties.


                              The OP has to verify spark or no spark since gas seems to be getting to the carb.
                              BOAT SPECS | FORUM HELP | STARCRAFT FORUM | SHOP iBoats
                              Please, no PM's (Private Messages) regarding boat/engine problems.
                              That is what the forums are for.
                              Only forum/moderator issues will be answered in PM's.

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