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Old    Matt Crowe (crowem87)      Join Date: Nov 2005       07-18-2011, 7:36 AM Reply   
Ok so I have an intermittent check engine light. After doing some reading I learned with my boat being a 2001 I can do the "paper clip" test to check the engine codes stored resulting in the check engine light coming on. When I did the test my check engine light flashed one solid flash, a pause, followed by two quick flashes. To my knowledge, this means code 12. From what I have researched, a code 12 is just telling me that the boat is in "service mode".

I am having some issues figuring out why I am getting this light. The boat runs very well (put 8 hours on it this weekend) but the check engine light flashes faintly every once and a while. Sometimes it will stay on, sometimes it will not. Does anyone have any ideas on how I can figure out this bug?
Old    Phatboypimp (phatboypimp)      Join Date: Apr 2005       07-18-2011, 8:36 AM Reply   
The 2001 Mastercraft Gauge Cluster has caused a **** load of problems for people. I don't know if it is related but you will find a lot of issues on those 2001 cluster panels.
Old    Matt Crowe (crowem87)      Join Date: Nov 2005       07-18-2011, 8:49 AM Reply   
Quote:
The 2001 Mastercraft Gauge Cluster has caused a **** load of problems for people. I don't know if it is related but you will find a lot of issues on those 2001 cluster panels.
Interesting, Can you go into more detail? The actual gauges themselves?
Old    Matt Crowe (crowem87)      Join Date: Nov 2005       07-19-2011, 2:50 PM Reply   
bump
Old    Jeff D (Jeff)      Join Date: May 2010       07-19-2011, 5:36 PM Reply   
I would post this on MasterCraft TeamTalk. There's a guy on there named JimN who is a very experienced former Mastercraft tech and he generally responds to posts like this with good information.
Old    Matt Crowe (crowem87)      Join Date: Nov 2005       07-25-2011, 1:03 PM Reply   
UPDATE: I finally figured out what the issue was. As I had suspected, it was debris in the cooling sustem! There were some leftover rubber particles from the last impeller and the main culprit was a large chunk of seaweed. It seems the seaweed was allowing water to flow through enough to cool the engine. The CEL was on randomly and blinked because the heat would get just above the computers comfortable limit, the light would engage, and then it would go on and off as the temp fluctuated a maximum of say 7 degrees....I really did not think the CEL would come on for this reason unless it was really overheating.

Thanks for all your help guys! This explains why it was not throwing a code....

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