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92 Prostar 190 with 351 running rough question

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  • 92 Prostar 190 with 351 running rough question

    92 Prostar with a 351 HO that I'm getting out for the first time this spring. Worked on it yesterday changing fluids and running in driveway and everything was great. Ran it for 15 minutes or so to get it up to temperature and again when I was done and everything worked well.

    Today before changing plugs and doing a couple more finishing touches it is not running well. Starts quickly and runs as long as you give it gas. If you try to hold any RPM or idle it won't stay running. Pulled the fuel filter in the tank (On the end of the fuel line) and cleaned it. Changed the plugs and still no progress.

    Looking for the next things I should check?
    2008 Prostar 197

  • #2
    Still running the original mechanical fuel pump?

    Maybe the diaphragm let go ...... Any exhaust details? Whitish smoke?
    Keep a tight line, and a smile on your face. Peace out.
    2008 Prostar 214 MCX
    Previous 93 Prostar 190 1.5:1 GT40

    "Left Foot Forward and preferring girls."

    Comment


    • #3
      Yes still the original fuel pump. Any simple way to check the diaphragm?

      As for smoke, don't notice anything out of the ordinary.
      2008 Prostar 197

      Comment


      • #4
        Start with the basics:

        New plugs are good....gapped correctly?
        Points or electronic ignition?
        What is the age and condition of the distributor cap and rotor?
        Same goes for the spark plug wires.
        What is the idle speed set at?
        Is your electric choke fully open after about a minute?
        How much old fuel in the tank and was it treated when you winterized?
        Is timing correct?
        Has the carb ever been rebuilt? Is it a 4160 or a 4010?

        Once you get through that, I would look for a vacuum leak. Spray carb cleaner around the base of the carb with the engine running (use caution here as it's flammable). If your engine speeds up with the carb cleaner, you found your leak.

        That should keep you busy for a while
        - Peter
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        • #5
          .........
          Rollin' Gangsta Style

          "Heavy" beer is for wine drinkers that are too embarrassed to drink wine in front of their buddies. "Light" beer is a drinkin' man's beer!
          If you want bling like the big dawgs, ya gotta lift your leg a little higher.....

          Comment


          • #6
            Just an update for anyone that has similar issues in the future.

            Pulled the fuel filter out of the bowl on the fuel pump and replaced it. Pulled the two inlet tubes off the carb and flushed them. Sprayed some carb cleaner in through the carb a couple of times.

            Re installed everything and now the boat runs great again. Guessing there was some dirt in the lines somewhere. Hoping to run the fuel I have in the boat ASAP and start with a fresh tank for spring.
            2008 Prostar 197

            Comment


            • #7
              Realize I am responding to an old post but having the same issue on my 92. Got it out for first run after winter and ran great all weekend, that is until the last run of the day. At that point the boat started to lose speed and RPM and forced me to come to a stop. It never died and when I would accelerate again, all was good and it would run but then randomly lose all speed and come to a stop. Initial start-up was fine and idle was fine, though admittedly as the day went out, I noticed cold start each time we went out would require me to give it some gas in order to stay running.

              I have read on here about spark plug changes, fuel pumps, etc. I did winterize it and treated the gas. Tried to run most of that old gas out before refueling. Did not do a tune-up this spring as I had done that last year.

              Any thoughts based on this? I know there are many things to begin analyzing and I am not mechanically inclined. Boat does have perfect pass and therefore has the dial to set the right tension for the throttle cable. I did loosen that prior to last outing because I was noticing that unless I keep my hand on the throttle, I progressively lose speed as the throttle comes back toward idle. So I did wonder if that adjustment had anything to do with it.

              Comment


              • #8
                My quick thought is that the mechanical fuel pump is starting to go ... they lose pressure at high rpms and don't seem to affect idle at all ... I had one that was going bad and the kids could kneeboard (20 mph) .... but I could not slalom because the engine would starve for fuel ....

                Mechanical fuel pump easy to get (skidim.com) and my best guess ....
                Keep a tight line, and a smile on your face. Peace out.
                2008 Prostar 214 MCX
                Previous 93 Prostar 190 1.5:1 GT40

                "Left Foot Forward and preferring girls."

                Comment


                • #9
                  Um...fuel filter out of the bowl on the fuel pump? Gonna have to go look at mine. Fuel filter in the tank? Man, I gotta start spending more time back on this forum.

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                  • #10
                    I wonder if given it is the first run of the season and I had some old gas with stabil in it and then I added new gas if I might be dealing with some issues there. Thoughts on adding the Startron product to the tank http://www.starbrite.com/category/marine to reduce the phase separation I might be experiencing which in turn could be causing the issue>

                    Comment


                    • #11
                      So I was out again this weekend and having the same issue. Only thing I did in between runs was to siphon out all of the old gas and replace with all new and some of the fuel enzyme treatment.

                      Fires right up, runs smooth in idle, cruises at around 20 fine. But you hit the throttle to take off and she backs off and sits down, sometimes dies. I can pull kids on a tube, but that's about it.

                      I am pretty sure it has to do with old fuel. First run of the year was as good as ever for two days, but then this issue started happening. Has to be a fuel related issue. So would the next step to be replace the fuel filter, then progress to fuel pump, then start thinking it could be the carb?

                      I will take the advice of changing the filter and spraying carb cleaner in and hope for the best. What do you do on that, take the flame arrestor off and spray directly in while running?

                      The difficult thing is that I have to trail to a lake, so testing is more difficult. Only way to know is to put the boat under load, which I am not going to do in my driveway. Anyone know if a marina with a shop can test under load with high throttle?

                      Any other initial suggestions would be welcomed.

                      Comment


                      • #12
                        I am still thinking fuel pump (if you have a carb version) then that would be the old crank driven low pressure fuel pump that would act like you mention now ... poor high rpm performance yet ok at low speeds.
                        Keep a tight line, and a smile on your face. Peace out.
                        2008 Prostar 214 MCX
                        Previous 93 Prostar 190 1.5:1 GT40

                        "Left Foot Forward and preferring girls."

                        Comment


                        • #13
                          OK, I appreciate the input. Yes, this is on a 92 with the carb.

                          Is this the right one? Any tips on the install? Something a novice can do?

                          http://www.skidim.com/prodinfo.asp?number=RA080002A

                          Comment


                          • #14
                            Easy to do .. minimal fuel spillage (but as always be careful anytime with fuel) low pressure so no real issues .. just remove lines, remove from block, and put the new one into the block and re-attach the lines - 20 minute job.

                            I hope that does it for you ... I did the same on my old 93 190 with 351 ... it would run fine for kneeboarding, but could not handle the slalom or barefootin ... replaced the pump and all was well.

                            I hope that does it ... really hard to troubleshoot via Internet symptoms but I would bet a rum and coke on it. Peace.
                            Keep a tight line, and a smile on your face. Peace out.
                            2008 Prostar 214 MCX
                            Previous 93 Prostar 190 1.5:1 GT40

                            "Left Foot Forward and preferring girls."

                            Comment


                            • #15
                              Great...I am going to move forward on the pump. Just one other thing, with input on this being related to distributor and replacing the cap. Wouldn't you guess that if I am getting no issues with spark that it is more likely somewhere else? I think first thought is to do the tune-up, but given the high rpm issues, everything says it's the pump. I have the rubber flexible fuel lines, so I guess skidim also recommends picking up the metal version.

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