What is the most common problem with Subaru engines?
The most common problem with Subaru engines is the head gasket failure, which can lead to significant engine damage if not addressed promptly. Subaru's boxer-style engines, while known for their reliability, are susceptible to this issue due to the unique design and operating conditions of the engine.
Understanding Subaru's Boxer Engine Design
Subaru's signature boxer engine design, where the cylinders are arranged horizontally opposed to each other, is a key factor in the head gasket problem. This layout creates a unique set of stresses on the engine components, including the head gaskets, which are responsible for sealing the combustion chambers and coolant passages.
Causes of Subaru Head Gasket Failure
The primary causes of Subaru head gasket failure include:
- Thermal Stress: The horizontal layout of the boxer engine causes uneven heating and cooling of the cylinder heads, leading to increased thermal stress on the head gaskets.
- Coolant Leaks: Subaru engines are prone to coolant leaks, which can cause the head gaskets to deteriorate over time, leading to failure.
- High Mileage: As Subaru engines accumulate mileage, the head gaskets become more susceptible to failure due to the cumulative effects of thermal stress and coolant exposure.
These factors, combined with the inherent design of the boxer engine, make Subaru head gasket failure a common and well-documented issue.
Symptoms of Subaru Head Gasket Failure
The most common symptoms of Subaru head gasket failure include:
- Coolant Leaks: Visible leaks from the engine or white, milky-colored exhaust smoke indicating a coolant leak.
- Engine Overheating: The engine running hotter than normal, often accompanied by the temperature gauge reading higher than usual.
- Loss of Coolant: Frequent need to top up the coolant reservoir, even without visible leaks.
- Decreased Engine Performance: Reduced power, acceleration, and fuel efficiency due to the head gasket failure.
If left unaddressed, a failed head gasket can lead to further engine damage, such as warped cylinder heads or even a complete engine failure.
Addressing Subaru Head Gasket Issues
The most effective solution to Subaru head gasket problems is to have the head gaskets replaced by a qualified mechanic. This process typically involves removing the engine, replacing the head gaskets, and thoroughly inspecting the engine for any additional damage. In some cases, upgrading to a more durable head gasket design may be recommended to prevent future failures.
Proactive maintenance, such as regularly flushing the cooling system and using the recommended coolant, can also help extend the life of the head gaskets and prevent premature failure.
Which Subaru engine is the most reliable?
EJ22. Considered "bulletproof," the EJ22 is often called Subaru's most reliable engine. It's a 2.2-liter four-cylinder boxer engine, and the estimated life of the EJs is over 250,000 miles, with many drivers reporting over 500k.
What is the life expectancy of a Subaru engine?
200,000 miles
Engine Lifespan: Subaru engines are known for their durability and longevity, with many drivers reporting engines that last well beyond 200,000 miles with proper maintenance. The key to extending the lifespan of your Subaru engine is regular maintenance, including oil changes, fluid checks, and tune-ups.
What year does Subaru have a bad engine?
Subaru WRX and WRX STI: 2008-2014 Models
The performance-oriented Subaru WRX and WRX STI from 2008 to 2014 unfortunately did not escape their own set of difficulties. These cars were plagued with engine problems.
Why does Subaru have a bad reputation?
Issues such as engine problems, failing oxygen sensors, Takata airbag recalls, transmission concerns, and rodent-attractive wiring can affect various Subaru models.
What year did Subaru stop using timing belts?
2011 was the first year for the newest version of the 2.5L normally aspirated engine. Years previous to 2011 the 2.5L, as did all Subaru flat four engines, used a timing belt. Beginning in 2011 the 2.5L uses a timing chain.
Do subarus last as long as Toyotas?
And, Toyota was awarded the most reliable brand at the 2021 Auto Trader New Car Awards. Also, Toyota's can last well past 300,000 miles (think of the million-mile Tundra), while Subaru typically lasts around 200,000 miles.
Which subarus have engine problems?
Subaru FA and FB series engines that have inverted spin-on oil filters mounted on the top of the engine, suffer from a prolonged dry start due to oil draining from the feed and output side of the oil filter at engine shutdown.
What is the biggest problem with subarus?
Transmission issues are the most common problem in Subarus, but defective airbags, faulty fuel pumps, weak windshields, and electrical issues are also known to happen. Subarus generally receive high reliability ratings, according to RepairPal. Transmission issues are the most common problem in Subarus.
Which Subaru engine is most reliable?
EJ22. Considered "bulletproof," the EJ22 is often called Subaru's most reliable engine. It's a 2.2-liter four-cylinder boxer engine, and the estimated life of the EJs is over 250,000 miles, with many drivers reporting over 500k.
What is the controversy with Subaru?
According to the class action lawsuit, Subaru equipped some of its vehicles with defective Denso fuel pumps that could cause low pressure, leading to engine stalling, sputtering, shutdown, and, possibly, a crash. The long-running Subaru fuel pump lawsuit has lasted for nearly four years.
