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E46 Engine Swaps
Replacing your motor? From direct replacements to more exoctic engines, if it's going under the hood of an E46 3 Series this is the forum to discuss it.

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Old 03-31-2019, 12:18 PM   #1
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M54B25 swapped into 2000 323ci dme questions

I bought the car preswapped. As in all he did was put the engine and trans 9n the mounts. What he told me is that all I need to do is wire it and itll work just fine as he has done several m54 swaps into m52 cars. Said I would have to use m52 intake manifold and maybe get a 2.5L flash. But the m54 manifold is still on the engine. And the m54 wiring harness is still on the engine. It looks as if everything will plug in. I'm just not sure if the DME will read the info.

The car still has the MS42 DME. I understand the m54s use the MS43 DME. If everything plugs in like it's supposed to will it run? I pulled the engine out to clean the old oil residue and such up out the engine bay for paint. So I'm getting all my info together now.

Thanks in advance. I've owned and worked on several bmws. M54 and older. So you can use bigger words and be blunt with me. I'm not scared of work.
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Old 04-01-2019, 12:57 AM   #2
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It'll run but there are minor differences and you won't have the power advantage
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Old 04-01-2019, 02:27 PM   #3
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Maybe it will turn on but the throttle wont work because m54 is drive by wire

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Old 04-01-2019, 04:18 PM   #4
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You need to replace the m54 drive by wire throttle body with the cable driven one originally on the 323.
The ms42 won't have a clue what todo with a drive by wire throttle.

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Last edited by HayWagon; 04-01-2019 at 04:19 PM.
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m54 swap, m542 to m54

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