My nephew and I are trying to fix our boat. It has a 5.7L Marine Power inboard motor. We bought it in good running condition, then ran it out of gas which is when we realized the gauge did not work! Filled it up with gas and now the motor will only run at high revs (7000) for 2-3 minutes from a cold start. Then the revs drop down to 3000rpm and no more. Switch it off and start again and the revs will go back up to 7000rpm for 21 seconds, then immediately drop back down to 3000rpm. That is every time - like it is being controlled by the control module. We had the module checked out (I guess it is called an ECM or similar) and it came back as working perfectly. We have replaced the fuel filter, both fuel pumps - low pressure and high pressure, and oil gauge. We really need to get it ready for family vacation.
No boat = SAD CHILDREN.
We are planning to take it out and work on it this week. Any ideas? $40 reward just for your genius diagnosis if it proves to be correct!!! (first one) Just think what you could do with that $$