Hi Guys, I'm a newbie to your forum so be gentle.  

My son just bought a 2005 Mazda 3 with a blown 2.3L motor. He found a really great deal on a used motor, but it's a 2.0L from a 2004 Mazda 3. We are trying to find out if the 2.0 motor will work in the 2.3L car. Blocks are the same and he found out that the Auto Transmission is the same for both motors. We assume that the 2.3L ECU won't work on the 2.0 motor?

Can anyone out there offer any advice? Would we only need to get a new ECU? Would the 2.0L ECU work with all the other electronic stuff in the car (dash, etc)?

He can buy this motor for less than 1/4 the price of a used 2.3L motor.

Any help or ideas would be greatly appreciated!

Thanks,
Flash