I know similar threads are out there, but I can't seem to find a complete or definitive answer specifically on the 2.3 to 2.0.

So my questions are:

• Can you program the 2.3L ECU/PCM with 2.0L configuration?
• Is the calibration file the "firmware" for the car?
• Will the 2.0L directly fit the manual transmission and mounting brackets?

I've done a lot of searching on this subject and have read varying opinions and suggestions. So what I am hoping is that there are people that have either done this, or know that it is possible. There are 1 or 2 other choices I am considering, but I really want to know if this is a valid option.

If possible I want to use the same harness and ECU. I have the VXNano and IDS 96.x software, as well as the calibration files for the 2005 2.3L and 2.0L from motorcraft.

I can obtain a 2.0L, 87K for $680 including delivery and taxes. It doesn't have the VVT but based on the research it gets slightly better mpg. I don't care about HP or torque. The 2.3L is around $1500-$1600, hence its beneficial for me to have the 2.0L.

Any links or definitive answers to the 2.3L to 2.0L would be MORE then GREATLY appreciated.

 

Why not just trade your car for a 2.0? Doing a swap like that is going to cause way more issues.

 

I guess thats my question. What sort of problems will there be? My background is electronics engineering with years of personal mechanical experience, engine swaps older vehicles. So this is more of a fun challenge then anything.

But whether I do the swap or not, I wouldn't mind knowing how it all works. I still can't seem to find anything regarding what the calibration files are?

 

I would very much doubt the ECU/PCM can be reprogramed from 2.3 to 2.0. If you use a 2.0 PCM you would have issues with PATS ( anti-theft)

For all the unknowns, cost blow-outs & potential stress, It would be safer and straight forward to replace your 2.3 with a 2.3 motor from a 2004 or 2005 Mazda 3 or 6. Use your PCM, wiring loom, intake & exhaust manifolds, accessories etc.