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Are MEFI 1 Marine and Auto Units Swappable?

Old 10-22-2017, 07:41 PM
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Default Are MEFI 1 Marine and Auto Units Swappable?

Engine's are '96 MerCruiser 7.4 LX Mpi's. I'm having erratic idling issues as discussed in this thread Help Chasing Erratic Idle Please

I ATTEMPTED to swap the ECU's today and happened upon MEFI 1's with two different Model numbers, #16234539 and #16189069. See attached picture, they are different sizes. I stopped right there as I'm not sure whether or not they are swap-able. The #162 was used by Mercruiser the #161 was not and seems to be a GM car/truck ECU (see attached picture from MEFI Burn). So now I have more questions than answers.

Should the Non-Mercruiser unit (#161) even be on a boat? Did modifications to sensors, harness, tune etc. need to be made to use in on my marine engine? I was afraid of swapping them and potentially cause more harm than good.


https://uniim1.shutterfly.com/ng/ser...714842/enhance

https://uniim1.shutterfly.com/ng/ser...714862/enhance

Thanks for any insight you can lend.
Keith
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Old 10-22-2017, 11:27 PM
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The 16189069 WAS used by Merc. That is the OEM unit on my 95 Merc motor. Still using it today. You should be able to swap them.
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Old 10-23-2017, 06:59 AM
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I would check the sensor plugs between engines and compare them to see if they are the same and then put in the correct unit.
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Old 10-23-2017, 12:22 PM
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Originally Posted by Warship2k15 View Post
I would check the sensor plugs between engines and compare them to see if they are the same and then put in the correct unit.
10-4 exactly the same. As far as I can see the engine harness' are identical.

Keith
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Old 10-23-2017, 01:00 PM
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But is the tune the same? Fuel-ignition curves.
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Old 10-23-2017, 01:44 PM
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Considering MEFI stands for Marine Electronic Fuel Injection, I doubt it came off a car.
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Old 10-23-2017, 02:25 PM
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Originally Posted by dereknkathy View Post
But is the tune the same? Fuel-ignition curves.
Originally Posted by Griff View Post
Considering MEFI stands for Marine Electronic Fuel Injection, I doubt it came off a car.
To answer the above and for the archives, I called MEFI Burn today with the issue. They stated any of the model numbers listed in the picture in post #1 will work but as Derek eluded to they must have the correct tune installed. MB also stated the MEFI's were used in other platforms other than the marine industry. If I have purchase another unit I'll need to ensure its loaded with the proper mapping for my engine, no matter what the model number.

Atleast I now know I can swap side to side and see if my issue goes away.

Keith
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Old 10-24-2017, 01:23 AM
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Originally Posted by Griff View Post
Considering MEFI stands for Marine Electronic Fuel Injection, I doubt it came off a car.
The GM ramjet motors and others used the MEFI controller.
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Old 10-24-2017, 01:25 AM
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Originally Posted by Tractionless View Post
To answer the above and for the archives, I called MEFI Burn today with the issue. They stated any of the model numbers listed in the picture in post #1 will work but as Derek eluded to they must have the correct tune installed. MB also stated the MEFI's were used in other platforms other than the marine industry. If I have purchase another unit I'll need to ensure its loaded with the proper mapping for my engine, no matter what the model number.

Atleast I now know I can swap side to side and see if my issue goes away.

Keith
The tunes between the motors should be identical assuming they haven't been fiddled with. If it comes down to installing a replacement ECU just copy one file and transfer it to the the new unit.
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Old 10-24-2017, 02:21 AM
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Originally Posted by Trash View Post
The GM ramjet motors and others used the MEFI controller.
I understand that, but its not used in any production automobiles. .
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