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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 09-29-2019, 10:53 PM   #1
Underground330i
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03 330i engine into a 04 330i will crank but won’t start??

Hello all, have a small question if anyone’s ran into this before when swapping engines? Here’s the run down, replaced engine in my 04 330i since the head gasket was blown. Bought a wrecked donor car(that ran good) for $800. We took the engine out of the 2004 and put the engine out of the 2003 into the 2004. Everything is hooked up, used the harness from the engine and the computers off the 2003. One set of the computers will crank the car over good, but won’t start it. You swap the computers and it will not crank at all.
Is there a security system I need to reset on the key or anything? Any help would be great! Thanks everyone!
Matt


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Old 10-01-2019, 10:43 AM   #2
Effduration
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You should use the computer (aka ECU, or DME) and (preferably) harness from the '04. It's possible the coils and valve cover of the '04 are different than the '03. In that case, you should use the coils and valve cover from the bad '04 engine.

Yes its a security system issue. The '03 DME is not going to play nice with the '04 electronics without a fair amount of coding.

Its should fire right up with the '04 DME installed
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Old 10-01-2019, 09:02 PM   #3
Underground330i
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Thank you for your reply! We plan to try this tomorrow! I will let you know the result!
I took the valve cover off the bad engine tonight(along with coils and existing wiring on the valve cover.) Also bought new spark plugs, so we will see how this goes tomorrow!
Thanks again!


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