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Old 01-20-2021, 10:30 PM   #1
LakixPompa
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Member#: 521740
Join Date: Jan 2021
Default 2004 WRX Engine Swap Help (Please)

Hello, I have a 2004 Subaru Wrx. I bought it about a week ago with leaking oil. Apparently, the engine was already swapped, but now ill be doing it again, the issue is that I don't know whether it's a jdm or a usdm engine. Based on how the front of the engine looks, I don't think it has avcs, whereas I'm still confused whether it's a jdm or a Usdm. It's important for me to know this because id like to have an easy plug-in swap, where all the connectors plug right in. I don't know if even buying an avcs engine would work with what I have there at the moment. I'm planning to buy an engine from eBay for around 1k, but I need to know what engine exactly so it could be an easy swap. Here are some photos of the engine, hopefully, you guys could help me out.

Engines I'm considering to buy - https://www.ebay.com/itm/254490005464 or https://www.ebay.com/itm/04-06-JDM-S...eGLeD&LH_BIN=1

Photos of my engine - https://imgur.com/a/tIECbT6
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Old 01-21-2021, 09:37 AM   #2
snow_bound26
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Member#: 395793
Join Date: Jul 2014
Chapter/Region: AKIC
Location: Split time between SLC and Lak
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2005 92x Aero
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All the plugs are the same. If you want to know if you have AVCS then look for the solenoids near the front of the heads very close to the fuel rail. If you want to know if it's wired for AVCS then look at the gray plug on the pass side strut tower for extra wires (it should only have 4 if no AVCS, 8 if it does) or for an extra wiring harness from iWire or iA Tuning for the AVCS.

As for swapping engines, it doesn't really matter if the current engine is JDM or not. Both are easy to swap in and all the plugs match as long as you get the an engine from the proper MY. 02-05 USDM will swap right in except the 02/03 PCV is different than 04/05 but is an easy swap.

A JDM engine that is coil on plug, and drive by cable (DBC) is basically plug and play as well. Once again, the PCV may be 02/03 type or 04/05 type. But is just as easy to swap if you need to. AVCS is easier to install than swapping cams, and sensors to make it function like a USDM engine. Just need the proper ECU and wiring to use the AVCS.

https://forums.nasioc.com/forums/sho....php?t=2886072

This thread has cut through a lot of the BS on the different 205s to help people figure out which one to get. Big thing to take away from it is the swaps aren't hard. Try not to over think it. Learn how to identify the engine you're buying from the pictures and you'll know what steps you have to take.
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Old 01-21-2021, 12:29 PM   #3
Fndragn
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Member#: 470845
Join Date: Jul 2017
Chapter/Region: MWSOC
Location: Iowa
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2011 Sti
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I just did the I wire AVCS bulkhead kit Monday. It***8217;s so easy with there directions. I assume it will be worth it once I get to drive it!
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Old 01-22-2021, 12:59 AM   #4
LakixPompa
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Default

I know that I do not have a engine with avcs. The thing is... do you guys think that the engines that I shared with you guys (2 links of engines ) are good for the swap ? In terms of... if I changed the manifold , and didn***8217;t connect the avcs , the engine would plug right in ? Also which one would be better , single or dual avcs, because maybe one day I***8217;ll wire them up.
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Old 01-22-2021, 11:41 AM   #5
Fndragn
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I just did a ton of homework last month before pulling the trigger on my JDM long block. I didnt even look on eBay as an option. There are several importers that Id rather buy from. I used Jdmracingengines.com out of Canada. They are the same company as Jspec auto. Shipping was fast and I will know if it was a good one this weekend once I fire it up. I also spent about double what you were linking above. I wire has a lot of info in there site about identifying what is what. Check out the Bucky lasek video series in YT, they go over all of this from picking the engine at Jdm California, the steps to refresh it, and the install.
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Old 01-22-2021, 11:49 AM   #6
snow_bound26
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2005 92x Aero
Beige

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All the info you're asking for is in the link I sent you. It's why I created that link in the first place; to answer the majority of questions people have.

You said you don't think you have AVCS. I told you how to check. So when you post, write what you mean. Your words are all we have to advise you on.

Single AVCS is easy to covert for your 04. Dual AVCS is not and would require a lot of changes to make it work. If the engine you are looking at is drive by wire (DBW) then save yourself the trouble and get something else. Once again, that info is out there.

Stop asking people to spoon feed the info that's already been posted in threads many many times. Learn how to sift through the info. If you can't figure it out then maybe you should take your car to someone who is capable of doing the work to it.
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Old 01-22-2021, 02:22 PM   #7
Jack
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Also, if you put your location information in your profile, we can point you to shops who do lots of swaps. Look on top to the blue stripe. On the far left is user CP. Click that and add your info. I'm not going to give you recommendations for Rhode Island shops if you live in Arizona.
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