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Old 12-03-2006, 08:45 PM   #1
Scooby Newbie
Member#: 133432
Join Date: Nov 2006
Default RE:USDM EJ18 swap to EJ22 JDM or JDM EJ18

Hey ya'll,

well i sort of have a problem i was hoping i could get some help on. I just purchased a JDM EJ18 to replace the existing canadian EJ18 (i assume its USDM unless motors here in Canada are different from the states). Anywho as I started to swap the parts from the my EJ18 to the JDM EJ18 there were some significant things that were different.

Firstly the JDM EJ18 didnt have the EGR valve, polution thingy that goes under the intake, and a solid metal line near the opposite head of the intake which I believe to also be part of the EGR system( all of these potential places are sealed on the JDM motor),they only way is to drill or change the heads to be able to adapt the pieces from my motor.

The crank and cam sensors have female connectors with 3 pins where as the USDM motor has male 2 pins. The crank and cam sensor doesnt seem to be too much of a problem as I can take it from the USDM motor. BTW any idea why i cant remove the crank sensor on my motor its stuck seems like it expanded or something. for the crank sensor or even the cam sensor is it possible to cut and rewire as mentioned the JDM has 3 and the USDM has 2 wires?

Additionally the JDM intake manifold THROTTLE BODY is entirely different from the USDM. I know im supposed to swap over my entire manifold but the big issue lies within the EGR system. Having said that the Jdm motor doesnt have the ports for the egr i cant see that is not possible to use my intake manifold.

Anywho so im gonna check out the JDM EJ22 what do you guys think? will I still run into the same problem? unfortuantely there arent any USDM EJ18's or 22's around, bugger!

are you able to swap motors if one is USDM and one is JDM? or is the only way to swap a motor is if they are from the same country.

lastly what can i do to easily replace the stupid EJ18? its getting cold and my starlet has no heat so i need to get the subie on the road

thanks [email protected][email protected]!

here are some pics of the motor that im having difficulties with

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Last edited by cbrkp; 12-03-2006 at 10:47 PM.
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Old 12-06-2006, 02:33 PM   #2
Scooby Specialist
Member#: 66739
Join Date: Jul 2004
Chapter/Region: MWSOC
Location: Medina, Ohio
2002 WRX wagon


JDM engines will not have the same emissions stuff as you just found out. the EJ22's are in the same boat basically. to swap easily you'd want a 2.5 NA engine out of any newer legacy, impreza,forester. make sure the 2.5 has the same sensors as your 1.8 for emissions. it will plug right in after that. you'll need a stronger clutch for the 2.5 also.

it's all on here. do a couple searches for specific info first.

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Old 12-06-2006, 03:07 PM   #3
Member#: 124802
Join Date: Sep 2006
Chapter/Region: NWIC
Location: Bend, OR, USA
1996 22B-righton STi
Graphite Grey


Looking at your pics, the Can. EJ18 is a bit different than the USDM and the JDM. If possible, plug off/replumb the egr stuff off of the engine that you are using to work with your intake manifold and ALL of your stock sensors. That's key tyo getting it to fire up and run.

First off, stay with the EJ18, EJ20 SOHC, or the EJ22, don't go 2.5. Ideally one in the same vintage for the egr stuff to plumb in cleanly and one with the same exhaust ports, if not it can still work. You're reliability/ mileage will go down the drain with the 2.5..

As far as what you are doing, it's not that bad in the grand scheme of swaps. Use your intake manifold, sensors, A/C, alt., and the rest should go like clockwork. I just did a similar swap on my '93 to a JDM EJ20 SOHC, runs like a champ. Also have done a bunch of other 1.8>2.0 or 2.2 and 2.5>2.2 as well. If you hit the wall, or need more help getting it sorted, PM or email me at [email protected] .

Good luck!
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