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OBW EJ22 SOHC to EJ25 DOHC swap question.


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11 replies to this topic

#1 darkducati

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Posted 01 December 2011 - 11:47 AM

New to the forums here and have a question. Yes, I have searched the net throroughly and found different answers so I would like to get a second opinion. From what I have read I can swap an EJ25 DOHC into my OBW using the EJ22 harness, ECM, throttle body, and IAC valve while keeping the 25 complete with sensors, injectors, and exhaust/cats. Can anyone confirm this? Is there anything else thats needed?

To go ahead and answer the next question a freind had the car with the EJ25 and it was hit in the rear. The engine had head gaskets replaced and was serviced about 10k miles ago and was basically free. The EJ22 in the car has a head gasket that is leaking into the cooling sysem and over 300k miles so that is the reason for the swap.

Thanks for any help anyone can provide!

#2 grossgary

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Posted 01 December 2011 - 03:50 PM

impossible to answer without knowing what vehicle/year.

this is not a direct swap for 1990-1994 or 1999+ EJ22. that's probably why you're confused because the answer to your question (if it's a 1995-1998 EJ22) is "yes" it's a plug and play swap.

since you have the entire car you can swap the exhaust manifold with it if you have too. 95 EJ22 won't need it swapped - anything else will - but it's really easy since you have to unbolt the manifold from the engine anyway to pull the motor. after that it's like 3 or 4 more bolts to get the entire manifold off and put the EJ25 onto the EJ22 vehicle. bolts right up.

engine drops in and plugs in, nothing to it, just an engine swap.

if both EJ22 and EJ25 have EGR (the EJ25 will have it, EJ22's can vary) - then it's the same. if the EJ22 doesn't have it then everything still works fine but you'll need to work around that (easy).

use your EJ22 flexplate on the EJ25 engine if it's an auto.

powersteering lines just kind of hang there because the mounting points are different - but no big deal.

if it's a 1998 or 1999 DOHC then the bellhousing bolt pattern is different than earlier EJ22's but still bolts up and works just fine.

telling us what year you're talking about will help distinguish these details.

#3 darkducati

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Posted 01 December 2011 - 05:30 PM

Sorry about that, I know better. 1996 OBW with the EJ22 and manual trans. EJ25 is from a 1998 OBW with an automatic. Sounds like this will be very straight forward. Any possibility the ECU from the auto will plug and play with my manual trans car?

#4 GeneralDisorder

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Posted 01 December 2011 - 05:51 PM

You would be swapping in a VERY problematic engine in place of your super reliable 2.2. The EJ25D is very troublesome. You absolutely should NOT do this. It's a bad idea and will ruin the value of the 96 OWB 5 speed. That's a rare single-year model and highly desireable. If you want the problem engine then sell it and buy a 97 to 99.

HUGE fail to get 30 HP.

GD

#5 darkducati

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Posted 01 December 2011 - 06:20 PM

You would be swapping in a VERY problematic engine in place of your super reliable 2.2. The EJ25D is very troublesome. You absolutely should NOT do this. It's a bad idea and will ruin the value of the 96 OWB 5 speed. That's a rare single-year model and highly desireable. If you want the problem engine then sell it and buy a 97 to 99.

HUGE fail to get 30 HP.

GD

Did you read my post? I'm not doing this for 30HP.

#6 grossgary

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Posted 01 December 2011 - 06:29 PM

The 98 EJ25 will have EGR so if your 96 does have EGR it's simple.
Still works, swaps, runs just fine if it doesn't have EGR you just might need to plug up the EGR ports/solenoid or leave them for decoration?! lol

No need to swap computers - EJ22 ECU will run it just fine. I've swapped ECU's on EJ swapped vehicles and noticed zero difference at all, I wouldn't bother.

98 has a different bolt pattern but don't let it fool you - still bolts right up, no big deal.

You'll need to swap the exhaust manifold from the 98 onto the 96.

For auto's you need to retain the EJ22 flexplate, the flywheel is currently eluding me.....


I'd prefer the EJ22 as well without a thought. You could sell or trade the EJ25, they are easily sold due to multiple failures creating a steady demand for them.

If you were interested read about EJ25 head gaskets, bottom end bearing failures, and DOHC valve adjustments/burnt valves. The 96 will have about a $100 cheaper timing belt kit too.

All EJ25's are interference, and while most 96 EJ22's are supposed to be non-interference I've heard reports that some are not - like a recently bent valve EJ22 on another forum.

#7 darkducati

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Posted 01 December 2011 - 06:41 PM

Okay cool. Thanks for the help. Since the headgaskets and timing belt were done 10k miles ago I think I'll try and run it. I will likely take a look at the EJ22 and if it doesn't have a cracked head I may rebuild it. With 330k+ miles I'm sure it needs it and it leaks from everywhere there is a seal. It uses about 1/2 gallon in just 15 miles and runs on 3 cylinders so its pretty bad. If the short block is unhurt I my rebuild and use it for a frankenstein engine if there is head damage. Thanks again for the help!

#8 darkducati

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Posted 03 December 2011 - 11:06 PM

So I'm in the middle of this swap and things kind of off. The throttle body and IAC seem to be identical to the 2.2 down to the part numbers and connectors. The coil and knoxk sensor however are different. The knock sensor connector isn't the same but I can swap over the original 2.2 unit. No biggie. The coil however is completely different. The connector is different, the outputs are female on the 2.2 vs male on the 2.5 and its a different size so it won't bolt on to the 2.5 intake. Are the pinouts the same so I can just swap the connector? Any ideas on why they're different?

#9 davebugs

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Posted 03 December 2011 - 11:16 PM

I've had that happen with the coils.

Luckily I have enough parts around. If you swap coil and wires you're golden from another 2.5. From a 2.2 I'm not so sure.

WHen I've done this the coil connector to the ignitor was the same, but the sex of the plug wires was different.

You get in a jamb let me know. I'm putting stuff on Ebay and believe I have a box dug out with coil and pretty new factory wires - don't remember the sex of the coil but doesn't matter if you've got the matching wires.

And I should have many sets of coil and plug wires that are the normal ones.

#10 davebugs

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Posted 03 December 2011 - 11:41 PM

Also the coil off the old engine should work (generally 2.2 and 2.5's seem to be the same) and just get different sexed plug wires. Unfortunately the OEM plug wires are highly recommended on a 2.5 and somewhat pricey.

If the 2.2 plug wires will reach no harm in trying unless someone else pipes in with a no.

#11 darkducati

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Posted 04 December 2011 - 05:01 PM

Thanks for the help gentlemen. The engine fired up on the first try. I ran into a few more issues than expected but all in all a very simple swap.

#12 davebugs

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Posted 04 December 2011 - 06:16 PM

Good news.

It really isn't difficult at all. Your coil sex is really rather rare.




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