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Old 03-14-2011, 03:14 PM   #1
D3F0
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1993

Default Ej18 To EJ25 Swap help!

So I have been working on my car for a long time now and I finnaly got the money for the 1999 Ej25 DOHC engine with 65,000 miles. I had a really crappy ej18 in the car before that seems like it burned some oil and needed a water pump.



The engine was pretty gross it had a lot of Oil caked up in spots and it was way to weak for me so I got my newer engine and put a new clutch and flywheel in it and I am about to drop it in my car but I need some advice.



The New engine bolts up the same exact way as the old obviously because Subaru's are Lego's. I need to know is what exactly do I need to take off the old ej18. Below are the parts that are still on the old ej18 that I cleaned up a little.



I already plan on using the 1.8 ECU and all the
wiring,
Throttle Body,
Radiator,
Sensors,
tranny,
alternator,
powersteering,
AC,
fuel lines / filter,
MAF sensor, air box, intake pipe,
fuel pump

with the
2.5L DOHC motor
2.5L intake manifold
2.5L injectors
2.5L sensors (all)
2.5L coil packs
2.5L plug wires

With this setup will the car run perfectly?
Sorry i know that most of these questions have been answered in some way but I cant find the exact answers. Also Im just a black 17 year old kind trying to finish my swap haha help me out a little bit. Thanks
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Last edited by D3F0; 03-14-2011 at 03:44 PM.
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Old 03-16-2011, 11:41 PM   #2
D3F0
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Anybody wanna give me a little advice, I am putting the engine tomorrow and I wanna get the exact parts I need to make it run perfect.
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Old 03-16-2011, 11:55 PM   #3
69subaru360
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1998 2.5 RS

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You are on the right track.

Use the 1.8 coil. Remove the 2.5 IAC on the manifold and make up a plate to block off the opening.

It'll start and run good enough.
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Old 03-18-2011, 12:41 AM   #4
D3F0
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Thanks for the response, today i got the Ej25 in and the ej18 wire harness out. Tomorrow I will work on the wiring and all that hopefully it will run by the end of the weekend.
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Old 03-30-2011, 10:01 PM   #5
D3F0
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Alright so I put the car all back together the engine bay still looks like crap but its just for now until I have the time to clean it up here is a picture of what the new engine looks like so far don't mind how lazy its all put together I have some more work left. The reason I took so long to put it all back together is because my buddy snapped two bolts in the block while me and him were putting on the new oil pan take a look at how we had to go drill out the old bolts and make a whole new thread for the new ones. What is that sensor plug next to the hose?



Below is the 2.5 in her new home only 65,000 miles on her going into the 257,000 mile body haha



I just finished putting it all back together the engine is turning over and I believe i have fuel and no spark. I do not understand two things while putting everything together. First when I went to go make a bracket for the throttle body I did not understand what exactly I had to block off because they looked so similar. Also further down there is a picture of a sensor that I am not sure of.



The one on the left is from the 2.5 the 1.8 is on the right did I have to make a bracket to block off the IAC here because it didn't seem like it. I made a quick crappy bracket for the old coil pack to fit on the 2.5 manifold.



Once I had the bracket made I redid the plugs on the coil wires to make the 2.5 coil wires fit into the 1.8 coil.

There is a senor on the intake that I do not know exactly what it is. It might be the old IAC that i no longer need I have no clue tell me what you think it is.



I followed that diagram from my manual so i think the wiring should be all set I have a lot more troubleshooting to do tomorrow. Give me some advice and sorry for being such a noob like I said earlier I am only 17.

Last edited by D3F0; 03-30-2011 at 10:06 PM.
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Old 03-31-2011, 10:10 AM   #6
GEE-OTTO
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for 17 youre doing better than most . Following the book ensures troubleshooting will be much easier.
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Old 03-31-2011, 04:13 PM   #7
D3F0
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Haha yea I guess I am but yea I am using the book as my friend I have a lot of Homework and crap to do today so I can only spend about an hour trying things out but I should be able to get it all running this weekend. Thanks for the response
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Old 03-31-2011, 11:08 PM   #8
D3F0
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Here is the description of the plugs above
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Old 03-31-2011, 11:55 PM   #9
amoore131
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Try rs25.com for more info
Theres alot of info on there for 93-01 imprezas
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Old 04-01-2011, 02:29 PM   #10
D3F0
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Thanks I forgot about that forum I just made this thread on that site too
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Old 04-06-2011, 08:58 PM   #11
D3F0
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I found out everything the car is running. I need to sort out all my vacuum lines and ims sure it will pull hard
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Old 05-10-2011, 11:23 PM   #12
greg donovan
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how is this working out for you?

i have a 93 sedan that is waiting for a high compression 2.5 to be dropped in once we get all the parts.
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Old 05-17-2011, 08:50 AM   #13
D3F0
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My swap runs pretty good if the vacum hoses were all set the engine would run very smoothly. Its a much faster car now and it well worth the trouble of swapping it.
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Old 05-17-2011, 09:07 AM   #14
GEE-OTTO
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EJ18 = FAIL
EJ25D = Not o much


Nice swap and it seems to have went fairly error free !
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Old 05-17-2011, 10:08 PM   #15
D3F0
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Yea now I am working on doing a full drive train swap my old drive train is all rusted to crap I am trying to get a rusty or damaged RS for 1500 to 2000 dollars. Hopefully I can trade my truck for one and have a completely nice Impreza with no surface rust at all and Herculiner floors.
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Old 11-25-2012, 04:18 PM   #16
sterling326
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Could we maybe bring this thread back to life? I'm in the middle of this swap and that engine harness diagram just made me even more confused...
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Old 11-25-2012, 04:25 PM   #17
Storm
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What's the question sterling?

When I did this exact swap, I found that the IAC plug on the EJ18 wiring harness plugged right into the remote mounted IAC of the EJ25D. I think I extended the wires to make it reach, but it worked just fine from memory. I reused the ignition coil from the EJ18 and the injectors plugged right in too.

Post where you're having issues and someone will get you on the right track.

Jay
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Old 11-25-2012, 04:45 PM   #18
sterling326
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Just the guy I was hoping to respond! So looking at that diagram above the colors aren't matching up with the harnesses. Also there are three sensors under the 1.8 intake mani i cannot figure out. one is brown with a round black thing on it, the other is a grey sensor; identical looking to the sensor i just described,but it's grey. the last one has a blue plug in which i'm guessing is the purge control soleniod valve? I wasn't planning on using these things, but from the sounds of it i have to? I will take some pictures of things i'm uncertain of.
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Old 11-25-2012, 05:15 PM   #19
sterling326
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Is this egr stuff or the IAC?









what the heck is this thing.


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Old 11-25-2012, 05:52 PM   #20
J-hop
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man is the ej18 to ej25 that much different than a ej22 to ej25? This seems a lot more in depth. with the ej22 to 25 (at least to the JDM 25) there is essentially nothing that needs to be swapped from the 22 to the 25.... heck with my car the EJ25 ECU even plugged right in to my 22 harness (even though i was told several times this wouldn't work!!)
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Old 11-25-2012, 06:51 PM   #21
sterling326
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what year is your car. I know for sure you can straight up use the 2.5 wiring with the 2.5 ecu in a 95. but that will not work with my 93. ecu wont plug in..
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Old 11-25-2012, 07:39 PM   #22
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that is too bad, mine is a 98. I just noticed cruising online that there is a ton of terrible and straight up wrong information on the 22 to 25 swap in newer cars such as mine resulting in people getting lead down the wrong path and doing way more work than is necessary. Was hoping to save you some work but unfortunately that isn't the case
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Old 11-25-2012, 08:00 PM   #23
sterling326
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I appreciate it man. So looking at the second picture I posted, that sensor has two vacuum hoses, one going to the TB, and one going to the charcoal box. So i'm guessing that has to do with emissions, which I don't care about but I found a way to connect it anyways. Still not sure about the others. Hellp me out.
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Old 11-25-2012, 09:18 PM   #24
sterling326
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okay, so the first pic is EGR, that is not going on the engine. I will update as I go along. Correct me if i'm wrong!
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Old 11-26-2012, 07:44 AM   #25
Storm
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Yeah, the first one is the EGR system. If you had it before, you might as well use the one from the EJ25. The plug should match up. The other sensors are vent and purge control solenoids. Find a place to mount them and swap em over. I dunno what the heck that last thing is. Some sort of filter or one way valve.

Jay
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