Subaru ej25 engine problems

In Subaru Legacy introduced EJ20 engine which later became the basic for the whole brand. It was the first representative of the legendary EJ series. This 2-liter motor replaced 1. EJ20 engine has aluminum flat-four cylinder block, with cast-iron dry sleeves. Its cylinder block deck height is mm. Inside of it crankshaft with a piston stroke of 75 mm is installed, connecting rods length is On the block two aluminum heads are installed, one camshaft on each and 4 valves on the cylinder.

Diameter of intake valves is 36 mm, exhaust valves is 32 mm, valve stem diameter is 6 mm. Camshafts are set in motion with the help of timing belt. The recommended interval of replacement of timing belt for EJ20 is for each 60, miles of mileagekm. It showed the power HP at 5, rpm, and torque Nm at 4, rpm.

Power of Legacy 2 and Subaru Impreza of the 1st generation was increased to horsepower. Their power is HP at 6, rpm. Also EJ and EJ used the new intake manifold which is good at low and mid rpm. Such motors show HP at 5, rpm. Specially for Legacy BLEJ engine was improved: it uses lightweight cylinder block with lightweight sleeves, modified intake manifold and headers.

These improvements allowed to increase power to HP at 5, rpm, and the torque increased up to Nm at 4, rpm. EJ motor differs in use of MAF-sensor and electronic throttle body. Power of EJ engine is HP. EJ20 motors gained great popularity due to their turbocharged versions.

Turbocharged EJ20G was the first such engine. The capacity of the EJ20G stock fuel injectors is cc.

This motor used Mitsubishi TD04 turbocharger, and the maximum boost pressure is 11 psi 0. You can find such motor on Subaru Legacy RS. Its power is HP at 6, rpm, and its torque is Nm at 3, rpm. Max boost pressure for Impreza WRX sedan is Its power is HP at 6, rpm.

Power increased up to HP at 6, rpm. EJ20K injector size is cc. The boost pressure was This engine was produced since and was the biggest engine of the EJ family. It was widely applied in all main car models. Subaru EJ25 engine used the aluminum cylinder block with dry sleeves. It is similar to the EJ20 cylinder block, but diameter of cylinders was increased to It contained the crankshaft with a piston stroke 79 mm.

The rod length remained the same Due to all this it was possible to get 2. The timing system uses timing belt. The timing belt replacement is necessary for each 50, miles of mileage 90, km. In pistons were modified, and power increased to HP.

This motor was used for Subaru tillthen it was replaced by EJ engine. In the State of California you can find EJ engines, meeting the advanced environmental standards. EJ differs in intake system, throttle body and the placement of idle air control valve and MAP sensor. Since Subaru started producing EJ engine. It improved its ecological index. Sincethey began to apply variable valve lift system i-AVLS, on the intake side.

In this motor was slightly modified: it received lightweight pistons, changed intake ports, new plastic intake manifold, new spark plugs, improved i-AVLS system and lightweight exhaust system. Now we will examine engines with DOHC heads. It is a direct successor of EJ25D and refers to Phase 2. The compression ratio was reduced to 8. Maximum boost pressure is Also there is EJ version with the increased intercooler and with maximum boost pressure It allowed to receive the power HP at 5, rpm.

Its maximum boost pressure This is enough to get HP at 5, rpm. Because of this, power increased to HP at 6, rpm, and torque Nm at 4, rpm. EJ25 firing order is The main problems of EJ25 are high oil consumption, oil leak, knocking.

EJ20 engine has similar problems. HERE you can learn in details about them their reliability. Besides, due to the increased diameter of cylinders, sidewalls between cylinders became thinner.The 2.

The engine became widespread in all major models of the brand. This engine uses the similar EJ20 cylinder block which differs by the bigger bore Connecting rods length is the same, but the compression height of pistons is shorter by 2 mm These changes give 2. Camshafts are driven by timing belt as well as each EJ motor. The power of EJ20D is hp at rpm, but from it got new pistons, and its power output rose up to hp.

This motor was replaced in by the more modern EJ engine. The EJ engine was built for California State especially; it has another intake manifold and throttle valve for reducing emissions.

The EJ is another version of the EJ25 which appeared in Fromthis engine was fitted with the i-AVLS system, which changing the intake valve rising. The EJ was tuned again in - light pistons and headers, plastic intake manifold and new plugs. The naturally aspirated 2.

The Truth Behind The Subaru EJ-Series Engines - Tech-Knowledge

The EJ is a turbocharged version released in as the engine for the Forester. The compression ratio is 8. The engine has TD04L turbocharger produced 0.

The output of this configuration is hp at rpm. It uses a slightly different cylinder block and cylinder heads. The output is hp at rpm. The power of this engine is up to hp at rpm, and torque is lb-ft Nm at rpm. The EJ25 2. You can read about them here. Home Subaru EJ25 2. Subaru EJ25 2. Engine Specs Manufacturer.A class action lawsuit was filed against Subaru of America SOA because of a defect within the engine manufacturing which could lead to premature engine failure.

It was settled by the Camden, N. Subaru is also extending the powertrain warranty up to an additional eight years on model years or up tomiles. Owners can file a claim here and it must be done by May 22, Your engine may not have failed, but one way to determine if you could be having a problem is if you begin to experience a slight decrease in power which could be a sign of major issues ahead.

Leave your comments below, share the article with friends and tweet it out to your followers! Skip to main content. Here are the steps you should take. Who is eligible? Visit Torque News homepage for more stories.

Latest Automotive News. Performance Vehicles. Subaru News, Pricing and Reviews. Subaru WRX. Subscribe to Torque News on YouTube. Comments Christopher Gen My friends and I have on several Subarus over the years I have owned a WRX a WRX and have built the engine twice and now I own a Legacy GT all these problems stem from cylinder number 4 overheating and blowing out even the rod bearings go out on every Subaru model and even the ones with avcs the hoses always break and shatter.

Don't get me wrong I love Subaru but I wish there would be a better compensation or fix for the EJ series. John Mandel wrote on March 31, - pm Permalink. Any chance it extent to Forester xt or other xt models?

Kathy Taylor wrote on November 17, - am Permalink.


Currently having engine failure issues with my Forester XT and asking Subaru to provide a remedy. How about the cars?? Kasey Taran wrote on June 22, - am Permalink. How do Canadians deal with this issue?

Subaru 2.5L Engines are Known for Cooling Problems

Mike wrote on August 19, - pm Permalink. Have a bought 1 year ago with 23K miles. Rod blew at 30K. Subaru denied warranty because computer showed max rpm at 9K miles of and max mph of at 19K miles. Just wanting to know if I have any claim to fight this. Mathew Ickes wrote on September 7, - am Permalink. So if I own a sti that had engine failure is there nothing I can do. The car has had all maintenance and oil changes done on time with all the paperwork to prove it.

Spun a bearing atmiles and now have spent an easy 10g to fix it. Bob wrote on October 25, - pm Permalink. My WRX had rod failure while being serviced at a shop.

After presenting the claim, Subaru denied the claim because it was not presented to an authorized Subaru Dealership. Why would you take to the Subaru dealer that ultimately caused the issue. Is this correct? Good luck!A report from Law says the lawsuit has been settled following months of discovery. The motion says "Plaintiffs alleged that defendants were aware of this engine defect, but failed to disclose it to consumers.

According to the motion for preliminary approval of the settlement, class members will also receive a warranty extension providing free repairs for a period of eight years ormiles, whichever comes first, which is double the length of Subaru's new vehicle limited warranty, and a notable increase over Subaru's powertrain limited warranty 5 years or 60, miles.

Subaru will agree to reimburse all class members for percent of all out-of-pocket expenses they incurred for parts and labor that they paid to a Subaru dealer for the cost of a qualifying repair performed during the extended warranty period. Leave your comments below, share the article with friends and tweet it out to your followers!

Skip to main content. See what the plaintiffs get. Visit Torque News homepage for more stories. Latest Automotive News. Performance Vehicles. Subaru News, Pricing and Reviews. Subaru WRX. Subscribe to Torque News on YouTube. Comments Pete B wrote on August 28, - am Permalink. Even great rides from great manufacturers get disease that can be fatal.

The 2.

subaru ej25 engine problems

Regardless, the 2. Please make the right call Subaru. Be Great. Be the Best Again. Paul Cahill wrote on August 28, - pm Permalink. Why buy a brand new car Oliver wrote on August 30, - am Permalink. I only say DCCD. Gilbert Bandry wrote on September 3, - am Permalink. The Corvette's pushrod engine is a year-old design. Paul Cahill wrote on September 5, - am Permalink.

That's a dumb comment. Is it still carb'd? Is it still obd1? Does that 70 year old engine use forged titanium connecting rods? Sodium filled exhaust valves? Stephen Labounty wrote on March 7, - pm Permalink. This is the exact reason I bought my WRX also!

My Wagon, and Wagon both had to have an intirely new long block out in because of this. They fail to mention that the contaminated oil is not the only reason the EJ is garbage. The oil pan is not designed correctly, and the oil pump does not push out enough oil even close to the factory redline which starves the motor for oil and destroys the ring lands.Our years of experience in the Subaru aftermarket have shown us a few things.

The first is how to make a ton of power via bolt-ons, an engine build, and a performance tune. We've also learned a few things about what not to do - like how to not blow up engines. Unfortunately, the latter seems to occur very often with the EJ25 series of Subaru engines, and even in stock form they have shown to be prone to catastrphic engine failure. There are a few different theories regarding the failure of the pistons, each one as true as the last.

First off, lets define a few items inside your engine. The piston inside your EJ25 series engine are cast from Aluminum alloys.

The "ringland" portion of the piston holds the piston rings via channels cut into the piston head.

Subaru FB25 2.5L Engine Review

On the Subaru EJ and EJthere are three ringlands, which each have a separate job in regards to protecting the engine and piston. In some cases, these ringlands have been identified as the weak point on most Subaru engines.

The first ringland is an area that typically fails the most. It's most susceptible to damage since it supports the first compression ring, which seals out heat and combustion gases. The second ringland plays defense, blocking any remaining combustion gases from the combustion chamber and blocking oil that has snuck past the third ring. The third ring is special, as it is designed to force oil into the various parts of the piston, which helps lubricate and cool the combustion chamber and piston.

Below are a few of the reasons why many believe Subaru Piston ringlands fail. At the end of the day, the biggest reason is excess heat and pressure generated by engine knock, detonation, or pre-ignition. While not entirely true, this still holds value as an acceptable reason given the sheer value of the tune.

Subaru WRX/STI 2.5L Engine Failure Lawsuit; What Owners Can Do Now

While Subaru did a great job tuning for all altitudes and climates at various boost levels, there has been some notice of grey areas within the engines tuneespecially when driven under high load.

Stock engines as well as modded engines are at risk here. What do we recommend? Get your car tuned after every mod to ensure you're safe from detonation. Many performance companies attribute premature Subaru engine failure to a poorly designed crankcase breather setup.

This sends large amounts of oil back through the intake, dilating fuel octane and causing knock. Turbo engines cause lots of engine blow-by, and it gets considerably worse when running higher boost, but other instances add to the amount of blow-by your engine see's.

Run a proper Air-Oil-Separator AOS system that pulls oil from the intake system via a catch can, and recycles clean air back into the intake system.

See our post here for best Air-Oil-Separators.

subaru ej25 engine problems

In our opinion, one of the worst things you can do to your EJ25x is put heavy load on it at a lower RPM. Building 14 — 18 PSI of boost at RPM is a high load : low RPM situation, that may not have been properly tuned for your vehicle, especially if you have an aftermarket tune. You also shouldn't drive the car hard unless you absolutely need to. Despite popular consensus, the Subaru EJ25x wasn't designed for repeated beatings, so treat the engine nicely and it will last as long as you need it to!The Subaru 4 cylinder 2.

The HG leaks occur in 2. Subaru claims the problem was corrected afterbut complaints are still being made on later models. The to 2. The failure allowed coolant leakage into the cylinders, which often went undetected and resulted in over heating and engine failure. The to present 2. This engine also had, and may still have, an inadequately designed HG which fails early in the life of the engine. In this engine, the failure allows external coolant leakage, which can also result in over heating and engine failure.

Subaru recognized the HG problem in the 2. It is clear that the inadequate design of the head gaskets resulted in early external coolant leakage failures in numerous vehicles. I have a Subaru Outback Wagon with the 2. However, now at approximatelymiles, coolant is profusely leaking through the poorly designed head gaskets. The coolant leakage problem that occurs in 2. Without intervention, at least one head gasket in the 2. The design flaw was inherent in the 2. Nearly every Subaru vehicle with this design flaw will need to make this repair.

This has resulted in very large costs to Subaru owners who must pay for repairs that resulted from a time zero design defect. Head gaskets fail on other engines, too; the 2.

subaru ej25 engine problems

I concur the 2. However they seem to have stopped in where the engine design changed a bit. This is even evident in Consumer Reports which shows major engine problems for all the models except turbo only up to The major engine problem is the head gasket. The rest of the car earns high marks. The coolant conditioner a diluted stop leak that gives Subaru insurance to the problem across all models.

The turbo 2. They do maintain the cooling systems though. So your logic they all fail is not true. But plenty of other cars have issues as well.

The 3. Toyota and VW had problems with sludge build up in their engines a few years ago. The point is no automaker makes a perfect car, even the ones with a repuation for great reliability. Subaru stepped up the plate and offered to cover repairs for 8 years or k. This thread belongs in the Rant-N-Rave section if they still have itnot here in the area for actual car questions.

Subarus were having head gasket problems 30 years ago and then as now, Subaru denied there was ever a problem. Subaru even had a service bulletin issued way back when stating there was not a problem with their head gaskets marketing dept. Not phrased like that but you get the point.

JMHO here, but I feel the problem is a bit deeper than head gasket design. Another factor is lack or a head bolt retorque at a very low mileage. In theory torque to yield bolts should not be retorqued.

In practice it may be a different matter since every metal known to man changes its shape over time.

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