I have a CC with twin Honda BF75EFI and the starboard engine has lost 400 RPM at WOT compared with the port engine. The starboard engine runs great but has a slight misfiring at idle but runs strong all the way up to WOT. I have done everything to find out what causes the difference, changed plugs, switched and cleaned injectors, all new filters and new high pressure pumps. Switched ECU:s, props and so on. But the rpm difference is still there. This spring I took off the air silencers and cleaned the throttle bodies and cleaned Map sensors. The Map sensors looked OK but cleaned them. The throttle bodies were a bit dirty with some oil in the dirt. Both throttle bodies had the same amount of dirt in them but the starboard butterfly was not fully horizióntal at WOT, not the port one either, but a little more open than the starboard one. Adjusted both butterflies to almost horizontal. My question is if it is possible that they change over time and should the butterflies be totally horizontal at all? If not then you not getting WOT or?? When starting the starboard engine it was running ok and it feels that the misfiring is almost gone so next step is to take a testrun on the lake to see what happens. Any input is appreciated.
Thanks//Pikeman59
Thanks//Pikeman59