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    #1

    Running Issues

    So I am having running issues again. 2007 24ve with a MPI 360hp. Has the speed set and throttle by wire.

    The boat acts like bad gas or plugged filter. This problem has reared itself again. Got fuel at the Marina but this has also been going on with Station gas.

    Boat accelerates to a set speed but in a while will cut off or start to cough sputter spit backfire all those things. Sometimes will clean up other times not. I have put it in a power turn and let the load build and that has fixed the problem sometimes as well has just opening her up and hot dogging it. Another symptom is a slight missing sometimes while running however I do not believe this is causing the condition I am having but may be connected.

    Things I have done. Changed spark plugs, helped for a short period. Fuel filter. Oil changes and battery checks. Fuel pressure is up all the time even when the engine coughs and spits. Added Seafoam, injector cleaner and octane boost. Did not cure the problem.

    Any thoughts or trouble shooting tips will really help. I am hoping Mr. Forte will chime in with some advise.
    Wake Up or Stay On Shore!
    Tags: None
    #2
    What about the distributor cap and rotor? Could have corrosion on the inside.

    Comment

      #3
      Why did new plugs help for a while? Does the engine foul plugs? That would be a big hint.

      Comment

        #4
        Yea what do the plugs look like now and how many hours are on them?? Could have bad plug wires and as stated above distributor could be bad it if it's a coil on top of plug motor as I'm not to familiar with newer boat motors and when they got what this really sounds like a coil breaking down. Could also be clogged injector most of the "cleaner" in injector cleaners gets filtered out by the fuel filter

        Comment

          #5
          My next step is the cap, rotor and wires. However I still believe it is a fueling problem. The plugs were changed last year when this issue started. The removed plugs looked to be in good shape and no indication that any cylinder was fouling or acting up. I did the filter at the same time. This seemed to work for a day or so and the problem came back.

          While reading other posts it seems that others have had the same issue. They change out everything and it still comes down to something in the fuel system. Could be my pump however the fuel pressure does not go down under load. I do not believe it is the plugs. They only have about 25 hours on them. The old ones went 650 hours. I will do plug wires when I find where to get some.

          Does any one know about the G-Force fuel pump system and how it works?

          This issue has been a problem others have had while I read other similar posts. Where can I get a computer tester for this so I can see what codes there may be?
          Last edited by Wakeman22; 06-06-2015, 11:43 AM.
          Wake Up or Stay On Shore!

          Comment

            #6
            Originally posted by Wakeman22 View Post
            Where can I get a computer tester for this so I can see what codes there may be?
            http://www.rinda.com/marine/diacommarine.htm

            Comment

              #7
              Here is an additional source for diagnostics.
              https://www.obd2allinone.com/mefiscan.asp
              Mike Allen, Tigé owner since 1997

              Comment

                #8
                We had a similar problem last season.
                If it is your fuel line there is a little screen the size of a thimble on the end of the line which might be rusted or have something stuck in it, causing the boat to have to work to get gas.
                100 hours later running and still perfect.
                We relaced our fuel pump and all that too and no luck

                Comment

                  #9
                  Reid your boat is a lot newer than mine but where exactly is this screen?
                  Wake Up or Stay On Shore!

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                    #10
                    Allen the tool you linked is for an OBD2 system similar to a car connecter. My boat is different. I already have the OBD2 scan tool for vehicles. But I do like the program that comes with that system. I need something like that to log in the events as they happen in real time and not just a code only flasher.
                    Wake Up or Stay On Shore!

                    Comment

                      #11
                      Just had this happen on the test drive, find your low pressure fuel pump, it's on the right side if facing the rear of the boat. There is a cooler line that wraps around the pump to keep it cool, over time the epoxy that holds it wears off and slides down and disconnects the power wire, it's just a post that it clamps to. Use some zip ties to hold it back up in place if it's disconnected. Hope this helps
                      My life's journey is not ending up looking pretty, its sliding in broadside, used up, worn out, screaming "What a Ride"

                      Comment

                        #12
                        Originally posted by Wakeman22 View Post
                        Allen the tool you linked is for an OBD2 system similar to a car connecter. My boat is different. I already have the OBD2 scan tool for vehicles. But I do like the program that comes with that system. I need something like that to log in the events as they happen in real time and not just a code only flasher.
                        No, that's just the company name. That link is for MEFI (Marine Electronic Fuel Injection) You just need to know which MEFI system you have to get the correct plug for your ECM. I have MEFI 1 and use it on my boat with a small laptop. It shows real time stats. You can see a picture of their ScannerPro software at the bottom of my linked page. I will see if I can upload an example of one we saved. Give the guys a call. They are very helpful and knowledgeable. If you get real serious about it and want to spend more $$, you can purchase their tuning software and change some of the parameters. http://www.aldlcable.com/mefitune.asp

                        If you have MEFI 5 or 6
                        https://www.obd2allinone.com/mefi5scan.asp
                        https://www.obd2allinone.com/mefi6scan.asp

                        Here is an informative thread on MEFI and how to tell which version you have.
                        http://www.pirate4x4.com/tech/billavista/MEFI/
                        Last edited by TeamAllen; 06-07-2015, 02:44 PM.
                        Mike Allen, Tigé owner since 1997

                        Comment

                          #13
                          I have the MP 6.0l engine and had similar issues a few years back. Thought it was bad gas for a while but ended up being the low pressure fuel pump. This is the smaller one (not in canister) with the cooling coil around it. We never did fuel pressure tests so I can't tell you what you should be looking for there.

                          http://marineenginedepot.com/MP/Mari...talled-Cooler/

                          If you have the same engine it is on the starboard side under the high pressure fuel pump in the canister. We never had to change our g-force high pressure pump but here is the link to that part.

                          http://marineenginedepot.com/MP/Mari...and-Cannister/

                          Comment

                            #14
                            I'm sorry I wasn't the one who found the problem, all I know is that it was just in the fuel line.

                            Comment

                              #15
                              Here is a screen shot from my laptop of a log I saved.
                              Attached Files
                              Mike Allen, Tigé owner since 1997

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