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Old 11-12-2012, 10:09 PM   #1
Registered User
Join Date: Jul 2012
Location: Boston
Posts: 23
My Ride: 2003 E46 330CI Conv.
M54B30 - 2004 Engine into 2003 330CI - Wiring Question

Hey guys,

I have my engine sitting in my car, tranny mounted up, now I'm onto the wiring.

This used engine came with the wiring harness attached so I figured I would use it. My question is this. There is a subtle difference in one connector in the "main brain" of the wiring harness.

My old wiring harness had 7/8 wires going into a 7/8 pin slot. The 04 harness has 3. I am assuming this is the part where the sensors talk to the computer. Was this just a simplification or complete difference.
This is the old connection, the new harness would only have 3 cables going into this slot.

Uploaded with

Is there anything else I need to know? Will the computer process everything correctly? Do i need to flash it? Do i need to pull all of the sensors off the engine and replace it with the 03(this would be extremely obnoxious to do with the engine already in).

Deepest apologies if this is posted elsewhere,
Thanks for your help,

Last edited by JohnnyZ91; 11-13-2012 at 08:00 PM.
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