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08 MC engine missing any suggestions?


gregy
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@Jody Seal or anyone else. My ski partners 08 Mastercraft, Prostar 197 with Indmar engine is missing, it has just under 400hrs. Misses randomly but seems worst when turning around the islands. He replaced cap and rotor, spark plugs and didn't help. Local dealer said maybe water in the gas so he pumped it all out, no change. We put a fuel gage on fuel rail and fuel pressure was very steady.

 

The check engine has not come on at all during this. Problem started happening sudden. Ran fine on day and then the next it started acting up.

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Two additional possibilities - the fuel pump can act like this. Some of the plastic pieces can break and float around at the wrong time. Finally, the air intake system can be dirty. Clean out the BFFA and the throttle plate. I'd start with the cleaning with a couple of cans of MAF cleaner.
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It's an MCX. It is dbw, I was thinking there might be a problem there. Eric, yes its still there, I was laughing when I wrote the title too.

 

I was thinking fuel pump, but think we eliminated that by check pressure. I forgot he put new fuel filters also.

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check and clean all your grounds. mine was doing the same thing and continued after changing the cap, rotor plugs and wires, and flushing cats. I took it to the dealer to be plugged in and he told me there was a bad batch of caps made and he had replaced 26 bad one;s just a day or 2 after replacing the old ones. but if it was not that check all the grounds.

I didn't see plug wires on your list, that is good maintenance with the moisture heat they operate in.

 

converters- my boat has well over 1000hrs and was very quiet as well when i first got it. there is a school of thought that says you need to run a boat with converters at over 4000 rpm's for more than 10 min every 50 hrs or so. I bought mine from a ski school and after the items above and 5 or 6, 10 to 15 minute trips at full throttle it is now obnoxiously loud and performs quite well.

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@jdarwin we had a computer with diagnostics, we weren't experts at using it though. The boat ran perfect today. I just can't believe that that distributor gear wore out that soon with less than 400 hrs. The teeth were worn to about half the thickness of the ones on the replacement distributor.
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