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Old 12-12-2011, 10:21 PM   #1
aboothman
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99L EJ255 6 Speed

Default 1998 Legacy Outback - blown DOHC 2.5 to 99 Impreza 2.2 SOHC

I just bought a 1998 Legacy Outback that pitched a rod out the top of the EJ25 DOHC block. I will be removing the EJ22 SOHC engine from my 1999 Impreza L soon for a swap, and I want to put it into the Outback.

Both cars are Manual. Is this possible?

I have not pulled the 2.5 out or apart so I do not know if the heads or anything else are contaminated. I had assumed I could drop the 2.2 in, but in the Impreza world (especially with trannys) there are PITA issues between 98 and 99-01...

I have been searching quite a bit, but I know that many of you guys know these older chassis and engines like I know the new ones
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Old 12-13-2011, 09:39 AM   #2
Patrick Olsen
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Quote:
Originally Posted by aboothman View Post
Both cars are Manual. Is this possible?
They're both EJ engines, so yes, it's possible. There may be wiring/sensor issues that you'll have to overcome.

Quote:
Originally Posted by aboothman View Post
but in the Impreza world (especially with trannys) there are PITA issues between 98 and 99-01...
There are?
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Old 12-13-2011, 11:51 AM   #3
aboothman
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Ya I know they will bolt together. I am hoping some of the guys more familiar with the differences between various year and models N/A engines could clue me in to what I will have to do.
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Old 12-15-2011, 12:43 PM   #4
aboothman
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Sooo as far as I can tell the Phase 1 2.5 DOHC from a 98 Legacy has EGR, and the Phase 2 EJ22 from a 99 Impreza L does not. My buddies 98 Impreza L has an EGR intake manifold so I guess I will borrow his intake manifold when it comes to smog time. For the rest, I guess it is just a matter of swapping over sensors from the 2.5

Any input? I can paypal beer money
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Old 12-18-2011, 09:27 AM   #5
Patrick Olsen
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There's more to EGR than just the manifold - it taps into the head. It's not enough to just have the EGR solenoid hooked up, the ECU has to actually "see" the EGR working (which I believe it does through the manifold pressure sensor). You'll still get the CEL for EGR if the mechanical side isn't actually hooked up.

You also need to look at the crank and cam trigger patterns to see if the '98 DOHC ECU will run the '99 SOHC engine.

Which type of IACV does the '99 SOHC engine have? The '98 DOHC engine has the IACV separate from the throttle body. If the SOHC engine isn't the same then that will be another hurdle to overcome.
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Old 12-21-2011, 06:01 AM   #6
ciper
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Though this is not what you are doing I wanted to add to the discussion.

I ran a complete EJ25D in my 91 Legacy on the original EJ22 ECU. Modifications to make it work -

Found a plug to seal the EGR port on the head (not actually necessary)
Swapped engine wire harness (used the EJ22 harness)
Swapped Throttle body (original Legacy had a reversed TPS voltage)
Put a washer under the cam sensor (sensor was too close to cam gear)

Your car will need to keep the exhaust manifold since the EJ22 has single port exhaust heads.
Is your Impreza automatic? If so the EJ22 will have a compatible EGR

It was fast as hell especially since I swapped a 4.44 final drive transmission.
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Old 12-26-2011, 01:26 PM   #7
aboothman
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HMM well I do have the 99L harness to go with the engine, but that is probably going to cause more issues than it solves. Unfortunately they are both Manual cars...never thought I would say that LOL. Also have the full exhaust...hell, I have the entire car minus the chassis haha.

My machinist has an EJ25 block and crank, so I might just look into pulling this blown engine apart. hopefully I can salvage the heads, or pull a set from the EJ22.

But long before that I will get the engine out and start comparing sensors, etc, etc. Sounds like fun

Thanks guys...Any more input?
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Old 01-27-2012, 06:23 AM   #8
06TRDude
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as far as i know the heads in that 99 are totally different then ej25D anything and nothing swaps lol the only motor that works i think is the older ej22 phase 1 motors and you have to put your intake on i think and it has to be a auto motor so that the egr is on the heads. i have a set of ej25D heads if yours are toast lmk!
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Old 01-27-2012, 01:13 PM   #9
aboothman
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well a friend has my old 98L 2.2 auto, so if all else fails, I could possibly persuade him to let me borrow it...perhaps with a 4.11 5 speed lol.

How much do you want for those heads? I may just take you up on that.
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Old 01-27-2012, 03:58 PM   #10
06TRDude
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60 bucks maybe? lol they come with everything. im pretty sure they're perfect but ill i look at them today. they came off of some legacy with 90k miles and the guy blew a head gasket so ill check the deck. you could run a 2.2l with 2.5l heads and run boost!
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Old 11-04-2013, 11:47 PM   #11
jiggseob
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Default I swapped a 95 ej22 into 99 leggy EJ25dohc

It was total plug-n-play. My 99 EJ25 dohc leggy started with headgasket leaks and was knocking bad. Couple sets of headgaskets, etc. Out it goes.

The three big plugs on the passenger side of the bellhousing unplug and plug in to the replacement EJ22 from a 95 Legacy auto.

Both had similar EGR plumbing. Both had similar IAC. EJ22 donor car had charcoal can in engine bay, EJ25 recipient car had charcoal can in back bumper. A short piece of hose to close that loop fixed it.

Exhaust bolts up fine. Intakes and heads will not swap.

EJ25 ecu in car seems to be running the EJ22 and all of its sensors just fine. Crank and cam sensors must talk to ecu the same way on donor / recipient cars. If sensors worked differently, car would probably not even run.

Now if only I can sort out the "shift solenoid B" 4EAT code... I'm pretty sure its not related to engine swap...

Jiggs
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Old 06-24-2014, 11:03 PM   #12
MonsterRSTI
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U need to adjust tps sensor
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