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97 crusader 502XLI alarm

Silverton360

New member
Yesterday while heading up lake to an event, was cruising about 3500 rpm for about 10 miles and all the sudden got an alarm and starboard engine went to idle. Oil pressure and temp was normal. Tried to push throttle up again but at 2200-2300, would get alarm and engine would go to idle. Continued in the other 10 miles at 2200 rpm on starboard eng.
After sitting at the event for about 6 hours, started it up, cruised back about 15 miles, eng running normal, then got the alarm and engine to idle. Again, all engine parameters were normal. Any ideas where to start? Oil pressure or temp sensor going bad?
 
I doubt "all engine parameters were normal" as, based on your description, the ECU went into RPM Reduction mode....

The fastest way to find the issue is to get a scanner to see what the ECU inputs are. Lacking that, you need to find the MEFI version you have and get the DELPHI manual. It will explain what drives the ECU into RPM reduction mode. From there, you can swap parts between the engines.....
 
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