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2003 sun setter vlx intermittent engine problem


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Help.....

Been over 18 months with the above issue,

Have changed the following with no impact

Plugs, all filters, ecu,oil pressure switches, gear box temp sensor, flushed fuel tank,blown through all fuel lies, cleaned fuel pump, not sure where to go from here.

Boat in in Scotland so running in cooler water and air temp so do not think vapor lock is a problem

Thinking now about distributor cap, ht leads, etc etc.

After it starts to misfire you can wait 10 secs at idle and you can go perfect for another 45 secs and then same again.

Any views would be appreciated.

Thanks

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Ok, like others have said and I have just proved tonight it is not any sensors or the fuel pump. Its not the distributor or the like. Its not ethanol in the fuel tank...Or mud wasps..(in the fuel vent)

I think its going to be the alternator....it happens across the malibu line of engines and boat platforms (well hammerhead and monsoon for sure ...and this may be one of the few common parts.

I'm ordering one tonight and we'll see if it solves the problem. I was noticing my oil pressure sensor pinging a bit before I lost power.

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And it's fixed.......

Put a pressure gauge on the fuel line and pressure did not waver when fault occurred, no so fuel line issue

Disconnected the boat harness and jump started the boat, fault still occurred therefore all bout related sensors ruled out.

Changed ignition module,...............

Fault cured, run all weekend without a glitch.

Thanks to Charlie Davidson for perseverance and patience.

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Ok, like others have said and I have just proved tonight it is not any sensors or the fuel pump. Its not the distributor or the like. Its not ethanol in the fuel tank...Or mud wasps..(in the fuel vent)

I think its going to be the alternator....it happens across the malibu line of engines and boat platforms (well hammerhead and monsoon for sure ...and this may be one of the few common parts.

I'm ordering one tonight and we'll see if it solves the problem. I was noticing my oil pressure sensor pinging a bit before I lost power.

Hi, turned out to be the ignition module ........

Thanks for the input, hope yours is cured now.

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