So, I've had a fairly ongoing problem with my boat. It's annoying because its not a big enough problem to keep us from being on the lake, but its annoying driving the boat because it will run rough sometimes. I posted on this last year or year before and still trying to work it out. Heres what its doing...
Starts perfect. Idles perfect. Engage to gear and will putt around perfect. Trying to go from engaged gear to any speed, boat will hesitate and sometimes die. It will do this anytime gas is applied (ie from just entered to gear to 1/4 throttle it will hesitate, maybe die, if it doesn't die it will continue up to speed and run perfect. From 1/4 throttle to 1/2 throttle, it will hesitate and bop bop bop a little, then continue up to speed and run perfect. When I drive, I can almost always keep it running without dying, but the trick is instead of easing up to speed, i go to say 3/4 throttle...it may hesitate a moment, but usually won't die, then start to climb speed at which point I will back it down to desired speed...and it will continue to run perfect!
Symptoms are obvious dying. Quite a bit of black smoke coming when it bogs and dies. Just replaced the IAC and even the new IAC is black so obviously getting too much fuel.
What we are dealing with: 03 Supra Launch SSV Indmar Assault MPI 320 5.7
Steps taken so far: been to 2 different dealers, spent ridiculous amounts of $$ at both and problem still not solved. Supposedly computer reading was sent to Larry at Indmar and by their evaluation the boat should be running perfect. New Cap, Rotor, Plugs, Plug wires. New TPS, New MAP, New IAC. New fuel pump. New fuel filter. Recalibrated Fuel Injectors.
Any other suggestions for solving this issue?
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