My wife like to tell me to leave stuff alone...but i just can't. 2003 220SD with 5.0 MPI 288hrs. Recently changed the following:
Wires and Plugs - Original
Cap and Rotor - Original
Serpentine Belt - Original
Thermostat - Original
IAC - Muffler - Dirty Original
Throttle Plate and Throat - Cleaned
Now mind you, the boat ran fantastic for the past two years that i've owned it and has never given me even a little bit of trouble related to these issues.
Went out and started the boat after all these PMs were done and she ran great. Coming back into the marina, 1 beep and the engine would stumble, not die, just almost. Did this a few time heading to the slip.
Looked all over, no issues found with anything above. Temp 170, Oil 40, RPM 600 and steady while idling at the slip. Then a beep, and died. Kept doing this even after i wiggled wire connectors, checked HEI boots...nothing.
Decided based on research to check the IAC by Ohm it out. Went to pull it off the spacer block and thought I didn't have the right hex wrench as it just spun...it's dark back there.
Come to find out it, my wrench was seated it was that both IAC hex bolts were loose...like real loose. So i pulled it off, looks very clean, Ohm'd out at 10.3 which is in spec. so it was reinstalled with some blue Loctite and tightened down properly.
Guess what. No more beep/stumble on idle. I can only surmise that while i was doing all this work and leaning on the spark arrestor/IAC bracket it may have caused the already loose bolts to become more loose.
And, before i found the loose bolts on the IAC, i ordered a VVM to go on so i can gain a little more insight to what the boat is telling me. I'll post a follow up with any stored codes...hopefully they correspond to a vacuum leak which I think was the culprit.
Wires and Plugs - Original
Cap and Rotor - Original
Serpentine Belt - Original
Thermostat - Original
IAC - Muffler - Dirty Original
Throttle Plate and Throat - Cleaned
Now mind you, the boat ran fantastic for the past two years that i've owned it and has never given me even a little bit of trouble related to these issues.
Went out and started the boat after all these PMs were done and she ran great. Coming back into the marina, 1 beep and the engine would stumble, not die, just almost. Did this a few time heading to the slip.
Looked all over, no issues found with anything above. Temp 170, Oil 40, RPM 600 and steady while idling at the slip. Then a beep, and died. Kept doing this even after i wiggled wire connectors, checked HEI boots...nothing.
Decided based on research to check the IAC by Ohm it out. Went to pull it off the spacer block and thought I didn't have the right hex wrench as it just spun...it's dark back there.
Come to find out it, my wrench was seated it was that both IAC hex bolts were loose...like real loose. So i pulled it off, looks very clean, Ohm'd out at 10.3 which is in spec. so it was reinstalled with some blue Loctite and tightened down properly.
Guess what. No more beep/stumble on idle. I can only surmise that while i was doing all this work and leaning on the spark arrestor/IAC bracket it may have caused the already loose bolts to become more loose.
And, before i found the loose bolts on the IAC, i ordered a VVM to go on so i can gain a little more insight to what the boat is telling me. I'll post a follow up with any stored codes...hopefully they correspond to a vacuum leak which I think was the culprit.