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  #1  
Old 07-14-2018, 10:09 PM
Nor*Cal Nor*Cal is offline
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Join Date: Jun 2018
Boat: 2003 Mastercraft Maristar 210 VRS MCX 350
Location: West Coast
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2003 MCX Intermittent Power Loss

So I took my "new to me" 2003 out for the second time today and after warming up it intermittently lost power or bogged down, just for a moment and the check engine light would flash and the whole thing would go away for another 20-60 seconds. It did not seem to matter what RPM range we were going at...

After grabbing a beer to think about the bad decision that was this boat , I fired up and ran for 10 minutes without an issue. However, when I hooked up fresh water in my drive way and ran the boat in neutral the issue returned.

So I've searched here for the last hour and from the threads I have found it looks like a possibility of a few things:

1.) Fuel Pump Relay
2.) Fuel Pump
3.) Ignition Module

I just replaced the distributor cap and rotor and checked the spark plugs.

Any ideas? I have 5 couples flying in for a boating weekend next week and really need to get on top of this. Thanks!
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  #2  
Old 07-14-2018, 10:28 PM
mtajpa's Avatar
mtajpa mtajpa is offline
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Join Date: Feb 2009
Boat: MC 1999 Maristar 230 sport
Location: Southwest
Posts: 994
Start here I am sure its a poor connections in the fuel pump circuit or bad ground from the pump connector to ground. Google teamtalk bad fuel pump connections, You can start here.
https://www.mastercraft.com/teamtalk...ad.php?t=42197
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  #3  
Old 07-16-2018, 10:32 PM
Cumminscj Cumminscj is offline
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Join Date: Oct 2016
Boat: 86 Magnum Skier
Location: Southeast
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Since the computer recorded a fault pull the code. That will likely give you a good indication of what is wrong and where you should start.
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  #4  
Old 07-20-2018, 03:19 AM
Nor*Cal Nor*Cal is offline
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Join Date: Jun 2018
Boat: 2003 Mastercraft Maristar 210 VRS MCX 350
Location: West Coast
Posts: 13
At this point it looks like the the ecm is fried. Will post more details with the code and so on Monday.
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Old 07-23-2018, 07:12 PM
Nor*Cal Nor*Cal is offline
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Join Date: Jun 2018
Boat: 2003 Mastercraft Maristar 210 VRS MCX 350
Location: West Coast
Posts: 13
Intermittent then no signal from the ECM to the fuel pump module. Then... the ECM completely went out.

$1500 later and things ran great for 8 hours on Saturday.

Anyone else have this problem?
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  #6  
Old 08-05-2018, 08:31 PM
Bruton Bruton is offline
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Join Date: Aug 2018
Boat: 2003 mastercraft 230 vrs
Location: South
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i am having the same issue but without the check engine light coming on.
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  #7  
Old 08-05-2018, 10:23 PM
Cumminscj Cumminscj is offline
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Boat: 86 Magnum Skier
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Posts: 281
Yes, but we just powered the fuel pump relay from another source. 400 hours later it's still running strong
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