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  • Indmar LY6 Starting Question

    Good Morning all - I am in the process of purchasing (under contract) a 2008 Mastercraft CSX 220 SS with an Indmar LY6 400hp engine. My question is this - when you first start the engine cold (not when its warm) the rpms go up and down (not sure of the range but its quite noticeable) for the first 15-30 seconds or so. I am told its the fly by wire controls setting themselves up. Since I have never owned a boat with this type of control I am curious if this statement is accurate. I searched the forum and couldnt find anything. I also looked over the Indmar manual on line and found nothing about it either.

    I just want to make sure this is true before taking delivery.

    Thank you in advance
    Scott

  • #2
    Originally posted by sraab928 View Post
    Good Morning all - I am in the process of purchasing (under contract) a 2008 Mastercraft CSX 220 SS with an Indmar LY6 400hp engine. My question is this - when you first start the engine cold (not when its warm) the rpms go up and down (not sure of the range but its quite noticeable) for the first 15-30 seconds or so. I am told its the fly by wire controls setting themselves up. Since I have never owned a boat with this type of control I am curious if this statement is accurate. I searched the forum and couldnt find anything. I also looked over the Indmar manual on line and found nothing about it either.

    I just want to make sure this is true before taking delivery.

    Thank you in advance
    Scott
    I've never seen this as the default behavior in a throttle by wire system. Maybe Jim or EngineNut will have an idea as to why it is happening.
    Tim
    Gone, surfing.

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    • #3
      Might be ok... but mine doesn't do that at all.

      Comment


      • #4
        It seemed like odd behavoir - the boat had been sitting - when we first started it - it would surge up and down for a short period than settled down. Upon warm restart it didnt happen. Now I have only witnessed the cold start once - I was told it was normal (because of the fly by wire) - but I really wanted to check it out before signing the final check as I cannot find anything about this online.

        Comment


        • #5
          Originally posted by sraab928 View Post
          It seemed like odd behavoir - the boat had been sitting - when we first started it - it would surge up and down for a short period than settled down. Upon warm restart it didnt happen. Now I have only witnessed the cold start once - I was told it was normal (because of the fly by wire) - but I really wanted to check it out before signing the final check as I cannot find anything about this online.
          Who told you it was normal?
          Tim
          Gone, surfing.

          Comment


          • #6
            The dealer.

            Comment


            • #7
              I just called my local Mastercraft dealer (not the one selling the boat) and spoke to a service tech there who said that it is normal behavior for that motor. Not so sure why I didnt think to do that first.

              Comment


              • #8
                Mine has always done this and it is only for about 15 to 20 seconds as you mentioned. It has never caused any other issues and my dealer said this was normal as well.

                Comment


                • #9
                  I just called my dealer and they also said that is normal for the LY6.

                  Comment


                  • #10
                    Thanks guys - I feel much better now. I will post pictures of the boat when I get it home!

                    Comment


                    • #11
                      So it's normal for an LY6 but surely not normal based on throttle by wire.
                      Tim
                      Gone, surfing.

                      Comment


                      • #12
                        Originally posted by CantRepeat View Post
                        So it's normal for an LY6 but surely not normal based on throttle by wire.
                        That's right. Dealer said the MCX and L18 don't have that characteristic.

                        Comment


                        • #13
                          So I guess wrong explanation from the purchasing dealer but still the engine behavior is ok - Its good to know if anyone else is looking at one of these.

                          Comment


                          • #14
                            Indmar LY6 Starting issues

                            Hi

                            I bought a 2008 XStar with only 150 hrs on it a couple of years ago. It has the LY6 Indmar 6ltr engine in it (Saltwater Series) and like you guys it hunted quite badly at cold startup (for around 20-30 seconds). Again, I was told that they all do it and not to be concerned.

                            Over the last 12 months the engine has progressively hunted more to the point that it stalled after a few hunts (5-10 seconds) meaning that I needed to provide additional revs to get the boat to run past the first 20-30 seconds. Once past the first 30 seconds the boat was fine all day.

                            I changed my maintainer to Maiden Marine in Crewe this year, and his (Mike) first comment was that as an Indmar specialist he didnít understand why it would hunt and had other customers with the same engine that didnít hunt, so it looked more like a common fault rather than a Ďfeatureí.

                            The first thing Mike diagnosed was that the fuel pump was failing. At first it was assumed that the previous owner ran the fuel tank dry at some stage but putting the engine back together (post service etc.) it started stalling again leading Mike to have concerns that the bleeding away of pressure was causing undue stress on the fuel pump and that the new one may fail soon.

                            The big question is, what is causing the pressure to bleed away that stops when the engine starts to warm and is about the engine being in a boat and not a truck?....

                            After many hours tinkering with components, fuel maps etc. Mike has diagnoses the O ring seals around the injectors. Because the routes/angles of the fuel lines into the engine are at strange and differing angles, it seems to be quite easy to get a seal that is bleeding fuel pressure. It would also seem that as the engine starts to warm that the expansion of the cylinder head makes the seal better.

                            Iím no mechanic and Iím sure Mike did a load of other things to the engine but a couple of things seem clear: 1) the wild hunting is not normal and 2) there is a common problem with the way the Indmar engines are installed into Mastrecraft boats.

                            If anybody out there has anything further to add please do as there maybe more contributory factors to the common fault on these engines.

                            I have yet to use the boat in anger this season. If anything further comes back I will post a message.

                            Comment


                            • #15
                              When I purchased my 08 with the LY6 I was told that it was perfectly normal for them to rev up and down like that for the first few seconds. I was told this by Eric from the boathouse in Chicago

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