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Old 09-29-2018, 10:52 AM   #1
Phrek
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Join Date: Jul 2014
Default EJ20X Swap Help!

Hello all! I have a 2012 WRX Hatch that spun a rod bearing and sent metal shards frickin everywhere. I decided to put in a EJ20X Longblock because it was the cheaper route, so i thought at least.

So here's the issue.

I got the ej20X small block and heads, took everything else off my EJ255 and put it on top of the ej20X including my crank sensor and both cam sensors, new timing kit & gaskets.

It keeps tossing code P0018 "Cam sensor bank 2" this is driving me crazy! I got a brand new timing pulleys and belt timed right. So i thought maybe the sensors dont talk to my ecu right. so i put my ej255 crank and cam sensors on it. that did not stop the code.

Its very strange the car seems to run ok besides the extremely low boost, maybe its a fail safe because there is a problem?

So basically to sum it up.

swapped ej255 for ej20X put all my parts on the long block.
Car seems to run ok except for the no boost and the P0018 code.
Replaced timing pulleys and belt, crank, and cam sensors.
when i clear the code it will not come back on unless the car sits and idles for 10 minutes. i can drive it on the freeway and the code never comes on, only when i stop.

I'm bad at explaining things so bare with me!
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Old 09-29-2018, 11:34 AM   #2
relative4
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2005 LGT 5MT Stg2

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The EJ20X has exhaust AVCS, which your ECU does not support. You'll need to either install a JDM ECU or tune your USDM ECU around the inactive exhaust cam timing. How does emissions testing work in your area?
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Old 09-29-2018, 11:53 AM   #3
Phrek
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Yes the AVCS is not used and i knew it had to be something with that because it has two plugs on the bottom of the block not plugged in because my wireing harness doesn't have them.

I live in california so i assume its the worst emission state.

So i should find a tuner shop and they can tune it up to not use the avcs and that should fix it? I assume since the inactive exhaust timing is also making the turbo be laggy with no boost?

Thank you for the reply!
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Old 09-29-2018, 01:44 PM   #4
relative4
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Yes, a tuner should be able to help.
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Old 09-29-2018, 04:44 PM   #5
bp05obxt
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Default EJ20X Swap Help!

It may be possible to swap exhaust cams and cam gears to get rid of the issue. I am not sure dimensionally how these heads come pare to USDM heads. Early 207 heads were dimensionally different and required machining to align the cam sensors with the USDM cams to obviously work with the USDM ecu.

It may be possible to measure the old heads and cam location to figure out if the cam position sensor is in the same location. If they are the USDM cams and USDM gears should work. Just make sure the lash is adjusted for the new cams... so on so forth

Last edited by bp05obxt; 09-29-2018 at 09:02 PM.
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Old 01-04-2019, 09:25 AM   #6
Scooby N a Subie
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Hey OP, did you ever figure out the problem? I'm about to do this swap in my 2012 wrx.
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Old 01-31-2020, 03:26 PM   #7
sebastian323
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Quote:
Originally Posted by bp05obxt View Post
It may be possible to swap exhaust cams and cam gears to get rid of the issue. I am not sure dimensionally how these heads come pare to USDM heads. Early 207 heads were dimensionally different and required machining to align the cam sensors with the USDM cams to obviously work with the USDM ecu.

It may be possible to measure the old heads and cam location to figure out if the cam position sensor is in the same location. If they are the USDM cams and USDM gears should work. Just make sure the lash is adjusted for the new cams... so on so forth
I am planning to swap exhaust cam gears to stock WRX cam gears and plug the oil holes on my EJ20x cams. The previous owner of my car simply ran the EJ20X on the EJ255 with exhaust AVCS unplugged

I know the EJ20X/Y has a higher compression ratio that the EJ205 , 255 etc. I am using my EJ20X/Y heads to build a hybrid engine with an EJ257 forged short block. I am wondering if there is any difference in the EJ20X heads (eg. combustion chamber size) that gives them the higher compression ratio than the EJ205 head. Maybe someone here knows what component is different in the EJ20X to give it the higher compression ratio.
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Old 08-29-2020, 11:45 PM   #8
Trapgarage
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Default I just did this swap successful 05 lgt

Basically what I used was an ej205 short block with JDM ej205 single avcs heads. I got two ej205s (usdm) for $400 and another blown JDM ej205 with a bad block for $40 with excellent heads (couple bent valves but I swapped those right out easy)
Original JDM sensors and cams were different, so I had to use my previous usdm ej255 cam sensors with my ej255 cams (ej205 had different sensor pickups on the end) my usdm ej255 cams fit perfectly into the JDM ej20 heads, the usdm cam sensors seemed a little loose and the bolt holes were in different positions on the JDM heads, had to tap new holes for the usdm sensors but she finally runs perfect, no check engine lights.
Our usdm cam sensors are very very sensitive, if you are doing this swap make absolutely sure they are in the identical position/place in the ej20 heads at first mine weren't and the engine barrrely ran (car wouldn't move) also did the idle relearn procedure. Getting into tuning now seems I have spark knock under load over 3k rpm when turbo spools, finally got vagcom cable to read/connect with ecuflash v.1.28 that's another subject. Good luck, just know it's very possible you just have to be patient and resilient/persistent. Better than paying 2-3 grand for another ej25 detonator engine 😆
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Old 08-30-2020, 03:27 AM   #9
ttnio
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those popular swap doesn't always work 100%

it will cause cost time and money more than you can ever think
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Old 09-03-2020, 02:32 AM   #10
SlammedSix
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Location: 06 FXT/08 STi/04 WRX/17 Outbac
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I have done numerous JDM motor swaps on US cars JDM EJ205 non-AVCS, JDM EJ205 AVCS and EJ20x swaps.

1st thing is do not purchase a JDM motor based off the intake manifold because it does not mean its the best motor for you. All the JDM motors need some sort of modification to get them to work with US electronics.

The EJ20x motor is the wrong motor to be installing in the Single AVCS USDM wrx or STi. Yes it can work but having the exhaust not be used is a bad thing. You can swap exhaust cams with non-avcs and non avcs cam gears, but then your still left with the oil control solenoids and cam sensors unplugged. Especially for smogging in California you need the motor to be a factory replacement.

The closest motor to correct for any US single AVCS is a JDM EJ205 AVCS, but it comes with its own issue of the cams needing to be swapped with US cams. Even then the cam pickup for the Left head needs to be modified because the cam sensor port is shifted over a little.

The car throwing a P0018 means there is an issue with that cam. If you used the JDM oil control valve that came with the motor it may have a bad oil control valve. A scan tool is the best tool to look at the value at idle and driving.

PS. I have an EJ20x in my 2008 STi, this is literally almost a plug and play affair. Obviously the cam/crank sensors and intake manifold need to be swapped but the cams are the correct style and the long block is ready.
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Old 09-11-2020, 11:00 AM   #11
fuzzyhead
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2000 2.5rs

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OP, did you ever sort this out?
I recently purchased a 2004 FXT with an EJ20X (I believe). The swap was done by Ecotech in St. Louis. They may be able to help you out if you have any questions regarding it.

There is a plethora of these EJ20Xs out there and it seems that it's becoming a more popular swap option due to it's price point.

Unfortunately the FXT is emitting white smoke out of the exhaust, so something is going on there.

Thank you for the info SlammedSix. Good stuff.
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