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Engines Delayed Response 1987 3255 Bayliner Avanti with OMC 5.7L 4V-gctid823962

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    Engines Delayed Response 1987 3255 Bayliner Avanti with OMC 5.7L 4V-gctid823962

    Good Morning to all!!!

    Have an issue here I was hoping I could get some insight on. The wife and I have recently picked up 1987 3255 Bayliner Avanti and discovered that there is a rather long delay in reaction time from the engines when put into gear and throttled up or down.

    The boat was delivered to us at Ditto Landing here in Huntsville around 4 AM a week or two ago. Got the boat into the water, started up, ran for around 15-20 minutes then we prepped to move it over to our slip. I can tell the throttle rigging is off on the port engine due to the fact that it continued to die once I pulled the throttled back into the neutral zone. Was able to back it up slowly with starboard engine only but I then discovered that once its put into drive, the engine will sputter and died a couple of times. Once I did get it started again and successfully put it into drive, I literally had the shift/ fuel lever full forward before the engine seemed to realize it was being engaged to go forward, at which time it lunged forward due to the build up and heavy influx of fuel.

    I was sure to take my time in shifting gears and throttling forward so as to give everything time to react but after the second or third time this thing lunged forward on us we decided to stop where we were and tie it off. There were too many other boats in the vicinity that were moored/ docked and I didnt care to risk damaging anybody else's vessel.

    After talking to the gents at the marina the next day we all had a sneaking suspicion that the shift/ fuel cables are out of Rig but I cant seem to find any documentation on rigging the shift and fuel control cables on the engine. Best I can tell from looking at the head control is that its a Teleflex Morse type control with both transmission and fuel encompassed by the one control. Im not distinctly familiar with these types of controls so I figured Id get on here and engage the brain trust and see if there is anything in particular I can do to verify what may be causing these delays and lunges.

    As for the port engine, I will disconnect the fuel control cable and extend it out a few threads to see if that will cause the sputtering and dying to stop once the engine is brought back down to an idle speed.

    Thanks in the mean time.

    JJ
    1987 Bayliner Avanti 3255
    Twin OMC 5.7L 4V

    #2
    Are these straight inboards or OMC Cobra drive units?

    Because if it's the latter; there are well know isdues with the shift system on these drives that can be cured but you need to either find a mechanic who knows them or learn to do it yourself.

    Possibilities:

    Sticking transom shift cable is causing ESA to be engaged when in gear

    Sticky bell crank in the pivot housing that is causing the same issue

    The ESA (electronic shift assist) should only engage when shifting from in gear to neutral. It lowers the idle speed to allow the dog clutch to release so it can shift to neutral. Drops it from about 600-->450 rpms
    88 Four Winns 200 Horizon 4.3 OMC
    98 Jeep Grand Cherokee 4.0/Selectrac
    07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

    Long Island Sound Region

    Comment


      #3
      Inboard/Outboard OMC Cobra Drive. Reading over your response and considering what the boat is doing Id say its extremely likely you have hit the nail on the head. Though Id love to be able to tinker with this and figure it out on my own, it would be better handled by a professional on doubt. I'll be taking copious notes mind you!!!!

      Thanks for the info. I will post any updates once I am able to get some resolve!

      JJ
      1987 Bayliner Avanti 3255
      Twin OMC 5.7L 4V

      Comment


        #4
        Properly running OMC engine shouldn't die when the ESA is ingaged, should only stumble...

        Bothe engines are going to need some fine tuning.

        https://youtu.be/g-2teoLn30g
        Joon, Kathy, Jaden & Tristan
        Uniflite 42 AC, DD 671N
        93 3058 sold
        92 2855 (day boat)
        91 Fourwinns 205 (lake boat)
        Longbranch WA
        Life is Good

        Comment


          #5
          Got down in the boat again today and discovered that both ESA switches were not being fully engaged when the boat was being shifted in and out of gears. The roller would follow the barbs of the shift lever but would never fully engage the button or hit the detente causing the engines to stumble. To be honest, it looks like someone had previously bent the roller arms away from the shift lever barbs.
          1987 Bayliner Avanti 3255
          Twin OMC 5.7L 4V

          Comment


            #6
            Mechanic made it out today and after doing some tinkering says the shift cables are also bad along with the ESA switches. In search of a parts manual for the boat now because it basically came with nothing!!!!
            1987 Bayliner Avanti 3255
            Twin OMC 5.7L 4V

            Comment


              #7
              Engine and drive parts list ...

              http://www.marineengine.com/parts/om...model=574AMFTC

              Free manual d / l ... You may need to use the arrows on your keyboard to navigate the site.

              http://boatinfo.no/lib/omc/manuals/1...omcmanual.html
              Be good, be happy, for tomorrow is promised to no man !

              1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

              '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

              Manalapan N.J

              Comment


                #8
                www.crowleymarine.com

                Look in the OMC parts section, put in your model # it's a number starting with a 57...probably on a sticker on the thermo housing or valve cover...

                When you trigger the esa switch it should drop the idle from about 600 down to 450. On mine I wound up replacing the switches (worn) and the ESA module (just quit working) about 2 years ago .Both lasted 28 years!
                88 Four Winns 200 Horizon 4.3 OMC
                98 Jeep Grand Cherokee 4.0/Selectrac
                07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

                Long Island Sound Region

                Comment


                  #9
                  Dougrussel.com

                  Will have in stock what other sites don't.
                  Be good, be happy, for tomorrow is promised to no man !

                  1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

                  '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

                  Manalapan N.J

                  Comment


                    #10
                    Wouldnt esa issue cause primarily hard shifting? The stumbling on fuel response would indicate to me carbs needing rebuilt.

                    I would do cables, esa, and rebuild and tune those carbs, and check base timing. They are all part of potential issues to your symptoms and maintenance pieces on a new boat.

                    On my omc, i idle high and its damn near imposible for me to shift into neutral, but done with this boat so...
                    1993 formula pc 31 twin 454 bravo 2
                    1989 2655 cierra 5.7 omc cobra
                    2014 "searay" tandom trailer

                    Anchor bay clinton river
                    Michigan

                    Comment


                      #11
                      This is a huuuuuuge help!!!!!!

                      Thank you very much!!!!!

                      Jj
                      1987 Bayliner Avanti 3255
                      Twin OMC 5.7L 4V

                      Comment


                        #12
                        Many mechanics do not understand OMC Cobra drives. Make sure your mechanic is familiar with them and knows how to properly rig the shift cables. Improperly rigged cables can quickly result in damage to the gears/shift dogs.
                        1999 3788, Cummins 270 "Freedom"
                        2013 Boston Whaler 130 SS
                        Anacortes, WA

                        Comment


                          #13
                          Take a look at this post... well explained with some photos shown.

                          http://www.baylinerownersclub.org/in...e?limitstart=0

                          very important she idles around 650-700 RPM, hold the shift interrupt switch down manually see what happens. also while holding that down, press the over-stroke switch down
                          Joon, Kathy, Jaden & Tristan
                          Uniflite 42 AC, DD 671N
                          93 3058 sold
                          92 2855 (day boat)
                          91 Fourwinns 205 (lake boat)
                          Longbranch WA
                          Life is Good

                          Comment


                            #14
                            Yes the ESA would cause difficult shifting to neutral but if it sticks on when in gear you will not be able to accelerate at all.

                            BTW as long as the engine is in good tune and the carb is not in need of a rebuild there should be no need for the idle to be any higher than 600 rpm...

                            Mine will shift with 2 fingers when everything is set right...

                            The spec for idle speed is 500-600 rpm in fwd gear in the water...
                            88 Four Winns 200 Horizon 4.3 OMC
                            98 Jeep Grand Cherokee 4.0/Selectrac
                            07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

                            Long Island Sound Region

                            Comment


                              #15
                              Some light reading ... you can print and have a hard copy to give your mechanic.

                              http://www.hastings.org/%7Estuart/cobra/kw-shift.html
                              Be good, be happy, for tomorrow is promised to no man !

                              1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

                              '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

                              Manalapan N.J

                              Comment

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