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Nord2903 replied to the thread 2007 4.3L Mercruiser Engine MPI Alarm.

Dang.

May 31, 2025
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Nord2903 replied to the thread 2007 4.3L Mercruiser Engine MPI Alarm.

Now that I am thinking about it and researched it a little. Is it possible the sea water circular pump on the engine has failed or is...

May 30, 2025
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Nord2903 replied to the thread 2007 4.3L Mercruiser Engine MPI Alarm.

You are correct.

May 30, 2025
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Nord2903 replied to the thread 2007 4.3L Mercruiser Engine MPI Alarm.

I’ll unplug it and test

May 30, 2025
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Nord2903 replied to the thread 2007 4.3L Mercruiser Engine MPI Alarm.

Electrical is far out of my realm of understanding. and the engine was is a refurbished jasper engine, I can't find a serial number

May 30, 2025
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Nord2903 replied to the thread 2007 4.3L Mercruiser Engine MPI Alarm.

After. Here's a before reading
May 30, 2025
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Nord2903 reacted to alldodge's post in the thread 2007 4.3L Mercruiser Engine MPI Alarm with Like.

Looks like it might be the water pressure reading, 2.2 psi is low for that rpm.

May 30, 2025
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Nord2903 replied to the thread 2007 4.3L Mercruiser Engine MPI Alarm.

Agreed, but the engine isn't overheating and that's a new water pressure sensor.

May 30, 2025
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Nord2903 posted the thread 2007 4.3L Mercruiser Engine MPI Alarm in Mercury MerCruiser Sterndrives & Engines.

I'm looking for a bit of guidance and a fresh perspective. I do understand the issue should ultimately be diagnosed via computer, and I...
May 30, 2025
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Nord2903 replied to the thread 4.3L mercruiser engine.

Just purchased one, the water pressure sensor is going to be replaced as well as the thermostat with the other one being tested when...

May 20, 2025
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Nord2903 replied to the thread 4.3L mercruiser engine.

exactly! unless the thermostat is stuck open. But shouldn't a code by thrown for that as well?

May 19, 2025
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Nord2903 replied to the thread 4.3L mercruiser engine.

Yes, the water pressure is way too low, what doesn't make sense is that if the water pressure sensor is faulty, I would expect that it...

May 19, 2025
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Nord2903 replied to the thread 4.3L mercruiser engine.

So I connected my vessel view and ran it under load and took multiple snap shots. I am getting an alarm at idle when I first start the...
May 19, 2025
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Nord2903 reacted to Fun Times's post in the thread 4.3L mercruiser engine with Like.

Thinking back, i believe it was the v8’s that first used the cam sensor first and a long delay in the v6 engines. In 2007+ Merc stopped...

May 17, 2025
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Nord2903 replied to the thread 4.3L mercruiser engine.

2007 engine. Engine has been scanned with a scan tool. Everything checks out. I am trying to find where I would find the plug that...

May 16, 2025

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