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Old 01-22-2019, 09:11 AM   #1
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Mfi? Idi?

Quick question for you smart people.

If an engine is described as a 7.3L MFI, (which I understand stands for multi-port fuel injection), is that the right engine?

I'm looking at parts and some of the places I'm looking do not have 7.3L IDI on the list, but they do have MFI.
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Old 01-22-2019, 11:15 AM   #2
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MFI would refer to a gasoline engine normally.
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Old 01-22-2019, 11:17 AM   #3
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Quote:
Originally Posted by Ronnie View Post
MFI would refer to a gasoline engine normally.
I don't think there's a 7.3L gasoline engine for a '91 Ford, is there? The specific description is 7.3L MFI.
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Old 01-22-2019, 11:24 AM   #4
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Hard to say if it's a typo, or they mean the powerstroke engine.

What parts are you looking for?
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Old 01-22-2019, 11:25 AM   #5
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Quote:
Originally Posted by Booyah45828 View Post
Hard to say if it's a typo, or they mean the powerstroke engine.

What parts are you looking for?
Freeze plug heater. I actually found the right one on Amazon but this was the only vehicle description that was even close on two different sites.
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Old 01-22-2019, 11:29 AM   #6
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It could be either the IDI or the Powestroke (T444e).

The year should tell you which one.
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Old 01-22-2019, 11:35 AM   #7
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Quote:
Originally Posted by PNW_Steve View Post
It could be either the IDI or the Powestroke (T444e).

The year should tell you which one.
Are the blocks different. freeze plugs are pretty standard in size. I would think a freeze plug heater would work in either engine, correct me if I'm wrong.
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Old 01-22-2019, 11:35 AM   #8
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Quote:
Originally Posted by PNW_Steve View Post
It could be either the IDI or the Powestroke (T444e).

The year should tell you which one.
Yeah, just never saw that "MFI" reference before.

I got what I needed so I'm not going to worry about it.
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Old 01-22-2019, 11:36 AM   #9
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Quote:
Originally Posted by o1marc View Post
Are the blocks different. freeze plugs are pretty standard in size. I would think a freeze plug heater would work in either engine, correct me if I'm wrong.
That did not turn out to be the case. But I did find the right one.
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Old 01-22-2019, 11:38 AM   #10
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All of my buses & trucks have a single injector for each cylinder.

Sounds like multiport fuel injection to me.......
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