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Alarm=engine Cutting Out!!!

1K views 18 replies 7 participants last post by  kilroy 
#1 ·
I just had this start happening. My alarm will go off and at the same time my motor will cut out 4,000rpms drop to like 3,000 then jump back up....... I checked everything I could but need to know what sensors trip the alarm and will cut the ignition? I know it is not the drive res. because I unplugged them and it still did it. Thanks

2000' 454mag mpi
 
#9 ·
Saturday I sucked some seaweed into my port water pickup and my engine temp went up enough to trigger the alarm. The engine immediatly dropped in rpm. Never had it happen before so I figure it is a safety feature built into the computer.

I would check with mercruiser and find out what else may trigger the alarm. I think the ignition cut out is typical.

Anyone else?
 
#15 ·
A MEFI3 system should store a code(s) when the ECM forces a RPM reduction. It may not be a numeric code that can be retreived with a simple code tool, but may require a scan tool to retrieve. Look for a "Oil Pressure" or "General Warning" code. The code(s) will not be erased by shutting off/disconnecting the batteries.

You may want to check for numeric codes anyway (obtainable with a 12volt LED and paperclip).

Dave
 
#19 · (Edited)
Okay update! Last night I went out with the scan tool.
1st tried to ground out diff. sensors so I knew which one was which alarm on the scanner Gen1, Gen2., Etc. Well I couldn't ground them out......
2nd went for a ride and the alarm went off with Oil Level Lamp and dropped rpms???? never leaving a code
3rd went for another ride alarm went off but Power Reduction never came on but again it cut power 1,000rpms for a split sec. never leaving a code
4th switched scanner to the other motor and tried to ground sensors but nothing....

Does the alarm get it's signal only from the computer or could it be grounding out under the dash sending a signal to the computer?????

HELP!!!!!
 
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