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Rev limit problem 8,1 inboard Mercruiser (496 Mag)

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Rev limit problem 8,1 inboard Mercruiser (496 Mag)

Old 06-18-2015, 01:23 PM
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Default Rev limit problem 8,1 inboard Mercruiser (496 Mag)

Hi! I bought me a new boat last year....
I have 2x496 MAG from 2003 and one of them used to be an inboard Engine. I have them now with Bravo One.
The problem is (only the inboard Engine) that the rev limit is 3500 rpm and i dont find any limit switch? Is the switch connected to the PCM box!?
I tryed to find a wiring diagram for the PCM box without result....does any one have an idea what can be the problem!??

BR, Lars
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Old 06-18-2015, 02:01 PM
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Sounds like it may think it is in neutral all the time.
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Old 06-18-2015, 04:29 PM
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If you are using the PCM 555 that was on the inboard engine to pair it to a Bravo then that is your problem

The PCM 555 for Bravo is a totally different tune than the PCM 555 for the inboard.

So are you using the inboard PCM for your Bravo app ?
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Old 06-18-2015, 04:31 PM
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The rev limit is programed in the PCM you can not jack with the wires or switches (none anyways for rev control) and connections to the PCM and switch any wires around. If you do say good bye to your PCM. Just saying
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Old 06-19-2015, 03:20 AM
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Thank´s BUP, that was one of my friends teori also.
I will borrow Another PCM from Bravo and try it efter the weekend.

Thanks again :-)
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Old 06-19-2015, 12:26 PM
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That is your problem using a inboard PCM for an outdrive app. See about 1 per year of the same issues. somewhat common today with boaters buying stuff off the net and do not have resources for tech support. Just saying.
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