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Engine hour report from ECM?

CAZ007

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Originally posted this in classifieds by accident, oops.
The hours listed at each RPM range only add up to 130 total hours, but the total engine hours listed on the report shows 547?? Heard that in some older boats, the hour meter in the ECM starts counting when the ignition is turned on and can be without motor actually running. Is this true? What could be going on with With this engine hour report?
Thank you!
 

Shrub Lurker

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Key on hour meter on dash registeres typically. ECM does not. Either someone left a key on for a long long time or the ECM has been changed or both,
You can live with it or get a new hour meter and hook up to 12v for whatever ECM says.

or just try a different prop
 

Lavey 29

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If you have an Motron / Motorola 555 ecm / pcm or even a few other branded ecms ---- with the proper scan tool anyone can erase engine rpm history and those total rpm hours for that end of it --- BUT you can not erase THE TOTAL engines HOURS. I scan marine engines everyday
 
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