2.2 to 2.5 01 Subaru WRX Outback engine swamp - now transmission errors occur

[phyregold]

I had originally create a topic, but I have no idea what happened to it.

https://www.ultimatesubaru.org/forum/topic/175674-01-impreza-outback-engine-swap-now-transmissions-error-codes-appear/

 

Long story short, had a 2.2 swapped to 2,5 and now engine codes appear.

P0335 - Crankshaft Position Sensor
P0325 Knock Sensor 1 Circut
p0733 Gear 3 Incorrect Ratio

 

I got replacement sensors for the 2.2 because I did not know what 2.5 the engine came out of.

 

So my two questions are, are the 2.2 sesnors fine?  And any idea why I got the P0733?
 

 

 

[idosubaru]

So it’s a 2001 Impreza with original wiring and computer and an unknown EJ25. Is that right?

Did you install the 2.5 engine with intake manifold or installed the 2.2 manifold onto the 2.5 engine?

Do you still have the 2.2 engine for parts?

Did you check if the 2.5 timing marks are aligned properly?

Okay now to an “answer”.

1. clear the codes and see which comes back first. 
2. Ignore the 0733 gear ratio or whatever it is for now. Tackle that last, it may just be an artifact of the others.
3. those knock sensors fail all the time. Use a 2001 2.2 knock sensor because that’s what computer the car has (or I’m assuming it has you need to answer my question above).  You can pull it and look at the bottom - sometimes they’ll have hair line cracks in them. But they can be bad and not show cracks too. Most common sensor to fail by a mile  

4. crank sensor. Two possibilities:

A. Timing marks are off - hence the earlier question. 
B.  There are two sets of crank and drivers side cam gears, one for auto and one for manual.

They are interchangeable they just have different trigger mark counts on the back, otherwise they’re the same. Manual transmissions have one set and automatics have another set.  So you could have installed a EJ25 from a manual trans into an automatic vehicle or an EJ25 from an auto into a manual trans. It happens even if you swap 2.2 to 2.2 or 2.5 to 2.5. 
 

But it’s an easy fix. Just swap the 2.2 drivers side cam and the crank sprockets onto the 2.5 and you’re done. Like I said - they’re interchangeable 

[idosubaru]

And yes you want to match the sensors to the computer. Which I think is a 2001 2.2 Impreza.  The computer is looking for sensors - so match that. 

[phyregold]

On 9/7/2023 at 9:32 PM, idosubaru said:

And yes you want to match the sensors to the computer. Which I think is a 2001 2.2 Impreza.  The computer is looking for sensors - so match that. 

Hey thanks, yeah that did the think, now I got a stubborn p0420 which I am about done with, i'm going to create another post of that.