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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 09-06-2018, 10:04 PM   #1
CrusherCurtis
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Difference between early and late M54

What's needed to make an 03 to 05 m54 work in my 01? My researching is showing that something is different.
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Old 09-06-2018, 11:52 PM   #2
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03/03 BMW switched to MS45.1 but since your car is 05 it already has it. If you get an engine built before 03/03 everything should still work fine. 09/02 is when the M54 got the newer valve cover for the pencil style coil packs
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Old 09-07-2018, 11:00 AM   #3
HayWagon
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Quote:
Originally Posted by armenh7 View Post
03/03 BMW switched to MS45.1 but since your car is 05 it already has it. If you get an engine built before 03/03 everything should still work fine. 09/02 is when the M54 got the newer valve cover for the pencil style coil packs
I beleive he is swapping an 03-05 engine into his 01.

Minor differences, MAF, SAP, O2 sensors, Valve cover.
The engine, intake manifold, TB is the same.

Sent from my tractor.
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Old 09-07-2018, 11:29 AM   #4
armenh7
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Quote:
Originally Posted by HayWagon View Post
I beleive he is swapping an 03-05 engine into his 01.

Minor differences, MAF, SAP, O2 sensors, Valve cover.
The engine, intake manifold, TB is the same.

Sent from my tractor.
Right right. I read about the 01 part but seemingly forgot about it
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Old 09-09-2018, 01:36 AM   #5
CrusherCurtis
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Done more research from this tread

https://www.e46fanatics.com/forum/sh...1113404&page=2

Based on the tread (and list below), is it safe to assume that If I have a running MS43 car (01 325i), a MS45.1 engine will drop right end and I won't need to change/source anything??

-DME (obviously)
-MS43 engine harness
-Transmission/O2 sensor harness, whether you have a manual or automatic transmission
-MS43 MAF (doesn't have built-in IAT sensor)
-IAT sensor (intake air temperature)
-MS43 O2 sensors
-Coil pack harness
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Old 09-09-2018, 03:25 AM   #6
armenh7
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Originally Posted by CrusherCurtis View Post
Done more research from this tread

https://www.e46fanatics.com/forum/sh...1113404&page=2

Based on the tread (and list below), is it safe to assume that If I have a running MS43 car (01 325i), a MS45.1 engine will drop right end and I won't need to change/source anything??

-DME (obviously)
-MS43 engine harness
-Transmission/O2 sensor harness, whether you have a manual or automatic transmission
-MS43 MAF (doesn't have built-in IAT sensor)
-IAT sensor (intake air temperature)
-MS43 O2 sensors
-Coil pack harness
You can drop in a MS45.1 engine into an MS43 but as you said above, you will swap all from old engine to new engine:
Coil packs
Valve cover
O2 sensors
MAF
Intake manifold (ms43 has IAT sensor plugged into intake manifold but MS45 has it blocked off)

Last edited by armenh7; 09-09-2018 at 03:25 AM.
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Old 10-08-2018, 03:17 AM   #7
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Vibration damper is different. Pre-2003 is 5-rib, post-2003 is 4-rib (for the AC compressor). You either need to swap dampers, AC compressors OR use a 4-rib belt and leave 1 groove blank on the AC compressor (the inner one)
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Old 10-09-2018, 08:27 PM   #8
CrusherCurtis
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Originally Posted by armenh7 View Post
You can drop in a MS45.1 engine into an MS43 but as you said above, you will swap all from old engine to new engine:
Coil packs
Valve cover
O2 sensors
MAF
Intake manifold (ms43 has IAT sensor plugged into intake manifold but MS45 has it blocked off)
Did this and it won't start, no fire. Any suggestions?
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Old 10-10-2018, 12:04 AM   #9
armenh7
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Originally Posted by CrusherCurtis View Post
Did this and it won't start, no fire. Any suggestions?
Crank or no crank?
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Old 10-10-2018, 02:39 AM   #10
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Crank
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Old 10-10-2018, 11:41 AM   #11
philliplong
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No need to swap the intake manifold, just pull the plug out and stick the IAT in the hole. Make sure the area around the hole is super clean before removing the plug though.


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Old 10-10-2018, 07:02 PM   #12
armenh7
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Originally Posted by CrusherCurtis View Post
Crank
Can you get a video of the rpm gauge while cranking?
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