Subaru EJ205 Breakdown

The EJ205 was first introduced in 1999 in Japan and 2002 in the US market. The name EJ205 is just a basic designation of an EJ engine, with 2.0 liters of displacement, and the 5 or 7 is an identifier for whether it came out of a WRX/Forester (5) or STi (7).

Swapping some EJ205 engines is much easier than swapping other EJ205s because not all EJ205 engines have the same characteristics. Depending on the year the engine was built it may have AVCS, may be DBW, and it might even be immobilized. It’s very important to look at which type of EJ205 before buying so that the most compatible model is purchased for your project.

Not sure which engine you have? What this video to find out!

There are two generations of EJ205s, 1999-2000 and 2001 to current. The biggest difference between the generations in Japan is the 1999-2000 is non AVCS while the 2001 to current generation has AVCS. If an importer lists a JDM EJ205 as non AVCS it is from 1999-2000. We have heard stories of importers labeling these non AVCS engines as 01-04 but this is incorrect, so make sure it has AVCS or know what needs to be done to make it work before purchasing the engine. iWire has more information about AVCS in our other blog post HERE.

Another difference between the generations is that 1999-2000 JDM EJ205’s are effectively non OBD2 while the 01+ models are OBD2 equipped. There is also an EJ205 that is Drive by Wire and AVCS equipped which is out of a 2003+ Forester. This is not a good engine to buy because the ECU is immobilized and has no tuning options. Also note that the 2005+ non drive by wire models are immobilized as well, but an older ECU can be put in place to eliminate this issue.

These EJ205s are from 2002-2005. Unlike it’s JDM counter part from 2001+, the USDM WRX model does not have AVCS. But don’t get this confused with the 1999-2000 models in Japan that are non AVCS because they are very different. The key identifier here is that the JDM models will have a coil pack with spark plug wires unlike the US model that is coil on plug (pics below).

I have a 2002-2005 WRX. What is the best engine choice for a replacement of my current engine?

Generally we would recommend the JDM EJ205 (or 207) from 01-04 because they are a plug and play replacement. Simply add in the AVCS wiring with our AVCS bulkhead wiring kit, plug in the JDM ECU and tune the car (the fuel in Japan is higher quality than here in the US) or just keep the USDM ECU and ignore the AVCS.

NOTE: The USDM WRX ECUs do not have the hardware to control the AVCS. To get this feature to work, you must swap to the JDM ECU.

Another option would be to go with the 1999-2000 engine but it would require swapping over a large number of parts to get it to work but those can be pulled off the original USDM EJ205. Some good info can be found here on how to convert a V5/6 to run in a USDM WRX.

The drive by wire Forester models could also be used, but the intake manifold from the USDM WRX would need to be swapped over. For this instance the iWire Bulkhead AVCS kit as well as the Intake Manifold AVCS kit would be needed.

I have a non turbo model and looking to do a turbo engine swap with an EJ205. Which engine would be a good choice?

For these swaps we would only recommend the JDM EJ205 from 01-04 with AVCS and a mechanical cable throttle or any USDM 02-05 WRX engine. Although the paths listed above for the 2002-2005 WRX could be applied to the older variations of the JDM EJ205, it’s generally more work than it’s worth. The engines are available so keep the swap simple and get the easiest one to install.

NOTE: The JDM WRX ECUs have been difficult to find. If this is the case, you can utilize a JDM 207 STi ECU as long as you do not have TGVs (STi ECUs don’t have the ability to control them open/close) and reflash it for your WRX application.

Unfotunately, iWire does not have any spare ECUs for these applications at this time.

Subaru EJ207 Engine Problems, Reliability, Specs

The Subaru EJ207 engine is a four-stroke introduced to the automotive market in 1991. The EJ207 is one of many variants manufactured by Subaru, belonging to the EJ series. The engine was only offered to the Japanese, U.K., and Australian automotive markets until it was succeeded by the current generation of Subaru FB engines. However, many American Subaru enthusiasts are purchasing the EJ207 for engine swap projects due to its power and performance.

The EJ207 is known to be more reliable and durable compared to similar Subaru engines such as the EJ257. Yet, like any engine, it does have its various problems as well. Regardless, the Subaru EJ207 engine should be respected for its power and exceptional performance. Throughout this article, we will further examine the EJ207 including power, specs, mods, and reliability.

Subaru EJ207 Engine Specs

The EJ207 has a unique layout that is a signature of Subaru’s manufacturing style. The configuration offers drivers that indistinguishable Subaru sound and performance experience. Subaru utilizes a turbo that boosts this engine’s power to an impressive 220-328 horsepower.

This Subaru EJ207 engine responds extremely well to modifications and upgrades, especially with the appropriate support mods. The specs don’t lie; with up to 328 horsepower and 318 lb-ft of torque, the EJ207 can accelerate and keep up impressively.

Subaru EJ207 Reliability

When car consumers think of overall reliability their mind does not immediately think of Subaru’s. This is especially true considering the fact that other popular models within the brand have had consistent issues with oil consumption and other various electrical applications. Subaru had a total of three lawsuits against them starting in 2012, specifically due to claims of engine defects for the EJ25 engines.

The EJ207 does have a better track record than the EJ257 in terms of durability and longevity. However, the Subaru EJ207 does have its issues as well. The most prominent problems seem to be due to high oil consumption issues and various oil leaks. Fortunately, the EJ207 does have thicker block cylinder sleeves to protect the engine’s bore, as well as a better capability of cooling off the cylinder block compared to the 2.5-liter turbo engines from Subaru.

When compared to other Subaru models of the same era and size, the EJ207 ranks above average in terms of reliability. Many drivers report that their EJ207 engine is bulletproof, however, we found that too many essential repairs were needed after a mere 60K miles to agree with that label.

It’s important to note that The Subaru EJ207 is commonly modified and driven aggressively, which are two factors that do contribute to the reduction of any engine’s lifespan. With that said, let’s continue below examining some of the problems that make a negative impact on the EJ207’s overall reliability.

Subaru EJ207 Problems

Some of the most common problems for the Subaru EJ207 engine include:

Although these issues made our list of common problems for the EJ207, it’s important to note that not all engines will experience them. However, high oil consumption and oil leaks do seem to be a prevalent issue for the Subaru EJ20 series engines. Especially due to the fact that most Subaru EJ20 engines currently on the road are up to 20 years old with considerable wear.

High oil consumption and oil leaks for the Subaru EJ207 engine have numerous different causes. The most common area for oil leaks within EJ20 engines is the camshaft seals and valve cover gaskets. It’s vital to check those two areas periodically, as they are the likely culprits of oil leaks. Oil leaks can lead to high oil consumption and further engine damage that will reduce the overall power and lifespan of the EJ20 engines.

Piston ring failure is also an extremely common catalyst for high oil consumption problems occurring within the EJ207. Like most cars, the EJ207 needs routine oil changes with high-quality oil in order to extend their mileage. High-quality engine oil and supreme fuel are crucial for both turbo EJ20 engines, including naturally aspirated versions. These issues are once again a reminder that proper maintenance and repairs are absolutely necessary.

1) High Oil Consumption & Oil Leaks

We recognize that turbo engines are prone to severe oil consumption and oil leak problems. The most obvious sign that oil leaks are occurring is dark oil puddles gathering underneath your car (aside from a newly lit dashboard light.) Drivers may also experience loss of power or acceleration when their Subaru EJ207 is experiencing severe oil leaks. The smell of burning oil and visible smoke emitting from the engine bay are also blatant signs that your engine is experiencing oil consumption problems. Camshaft seals, sparkplug tube seals, and piston access plugs may also be areas of concern.

Due to the wide variety of potential causes for high oil consumption in the Subaru EJ207, it is difficult to gauge repair costs. However, repairs for oil leaks on the Subaru EJ207 can range from $75 to $2000 plus depending on the parts needed and labor costs.

2) Engine Knocking Issues

This issue most commonly occurs on heavily worn Subaru EJ20 engines or those that have been heavily modified. A knocking sound and potential rattling are most likely stemming from problems with the 4th cylinder. The fourth cylinder is the hottest within the engine, therefore making it the most difficult to cool down. The increased heat then causes the cylinder to knock.

Drivers will likely experience engine knocking upon cold starts until the problem progresses to be more regularly occurring even after warming the engine up. Again, due to the variety of different causes for engine knocking, the repair costs can vary greatly. For example, a single spark plug replacement can cost five dollars, yet cleaning the engine heads can run you up to $800.

For more information regarding similar Subaru engine issues, check out our previous article on the most common Subaru EJ255 engine problems.

Subaru EJ207 Modifications and Tuning

The EJ207 is very popular amongst Subaru enthusiasts due to its ability to respond well to modifications. This engine has become associated with many engine swap projects on YouTube and various car forums. Any modded engine or engine swap project requires extreme care for detail in regards to fitment, proper installation, and balance of supporting mods. With good mods and a good tune, one can expect a substantial increase in horsepower and torque as well as a longer engine lifespan. The most common mods include:

Some of the mods we listed can function independently, yet most require a proper tune. For example, a new intake can be installed independently without creating any damage to the EJ207 engine. However, when tuned, the power and performance benefits from a new intake can increase the full potential. Certain mods, like a new downpipe or exhaust, are much more dependent on a tune to even function properly.

The fact that the Subaru EJ207 was not manufactured in the U.S makes the engine more difficult to find properly fitting parts for in America. The early WRX models are greatly appreciated for their response to upgrades and mods, some drivers boasting an increase of over 100 horsepower on their projects. However, like any engine, the Subaru EJ207 requires knowledge and patience to see a great increase in power without compromising reliability.

Subaru EJ207 Engine Guide Summary

The Subaru EJ207 was utilized in the Japanese WRX models from 1991 to 2001 until succeeded by the EJ205. The engine is known for its performance capabilities and continues to live on through Subaru enthusiasts to this day. The respected performance and reliability make the EJ207 favored over the EJ257 for many engine swap projects as well. We find the engine to be rated as average to above average in terms of reliability and longevity. Issues with oil leaks, engine knocking, and other needed repairs seem to be common for the EJ207 before reaching 60-80,000 miles. There aren’t many glaring flaws with this engine’s unique design; however, it lacks the reliability we would need to call this engine bulletproof.

The EJ207 is one of the more respected engines in the companies history and specifically within the EJ20 series. The EJ207 responds well to modifications yet requires high-quality oil and consistent maintenance. As you add more horsepower, the engine will require more supporting mods. It is essential for the EJ207 engine to be appropriately tuned for those seeking the ultimate boost in power and overall performance. With these upgrades in sync, the EJ207 can be an exciting and impressive engine project for any enthusiast.