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Old 03-21-2014, 02:31 PM   #1
Wichop
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BMW E46 Succesful engine swap with same ECU

Hi, just want to let know the e46 fans that i bought a used engine for my car and has been swaped succesfully, my car which had very bad problems (heavy misfire, overheating, leaking oil, burning oil etc) needed the swap since the head and valve job costs around the same 1,500 dollars aprox, i would recommend getting a head gasket replacement only if it was your first overheating and you have only coolant problems, but the cost of the complete engine itself is very similar to the cylinder head repair, so its your choice, if you swap to a bigger engine you would need a new ecu and keys programmed to that engine, but you can reprogram your original ECU to operate with the new engine(just read that, havent tried it).

The engine i bought was a canadian 2.2l engine I6 from a 320i, it was swaped into my euro 320i which used the exact same engine size.

The reason i am posting this is because i want to note (since i found no info regarding this procedure in the forum) that you can use your same ECU and keys when performing an engine swap for the exact same engine as i did.
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Old 03-21-2014, 08:01 PM   #2
Cavi Mike
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We know this. The ECU has no way to tell what engine is in the car. The ECU doesn't communicate with the engine, it communicates with the sensors and the EWS. Why would you think a different engine wouldn't work?
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Old 03-21-2014, 11:05 PM   #3
scottjoh
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You found nothing about it because everyone knows there no problem swapping just the engine. Since it's the same engine they will bolt up and connect up just fine. There is nothing unique from one engine to the next when they are made. The problem has always been the ECU is married to the EWS, keys and locks. That is why people are selling them as a sets on eBay. The problem there is with trying to get a new key. You need the registration for the vehicle that the ECU, EWS, key and locks came from with your name on it or BMW won't sell it to you, but that's another story.
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Old 03-22-2014, 08:25 AM   #4
BeMyWhip
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Good job OP.
Glad your swap went well.
Welcome to the smart ass board where everyone here knocks what you do and
Have to one up you with what they know.
Did you do it yourself?
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Old 05-27-2014, 04:38 AM   #5
Many330i
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Originally Posted by bemywhip View Post
good job op.
Glad your swap went well.
Welcome to the smart ass board where everyone here knocks what you do and
have to one up you with what they know.
Did you do it yourself?

+1
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Old 05-29-2014, 08:29 AM   #6
raptorman5174
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Quote:
Originally Posted by bemywhip View Post
good job op.
Glad your swap went well.
Welcome to the smart ass board where everyone here knocks what you do and
have to one up you with what they know.
Did you do it yourself?
+2
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