Honda Earth Dreams Engine Problems

Honda has long been known for producing reliable, fuel-efficient vehicles. With the introduction of the Earth Dreams Technology (EDT) engines, Honda sought to set a new standard for performance, efficiency, and environmental friendliness. These engines are designed to balance power and fuel economy perfectly, emphasising lowering emissions to meet increasingly stringent environmental standards.

However, despite the brand’s reputation for dependability, the Earth Dreams engines have faced notable reliability issues. This article explores the most common problems associated with Honda’s Earth Dreams engines, their causes, and what current and prospective Honda owners need to know. In addition, we’ll examine how Honda has addressed these concerns and offer guidance on maintaining the performance of these engines for long-term use.

What is Honda’s Earth Dreams Technology?

Introduced in 2011, Honda’s Earth Dreams Technology represents the company’s commitment to building engines that combine environmental awareness with high performance. The focus is on improving fuel efficiency while maintaining the driving pleasure that Honda vehicles are known for. These engines come in various configurations, including turbocharged four-cylinder engines and naturally aspirated V6s. They are fitted in models ranging from the Honda Civic to the larger Honda Accord and CR-V.

Critical features of Earth Dreams Technology include:

• Turbocharged Engines: Honda introduced smaller engines to replace larger, naturally aspirated engines. Turbochargers allow smaller engines to produce more power, enhancing efficiency without sacrificing performance.
• VTEC (Variable Valve Timing and Lift Electronic Control): Honda’s signature VTEC system is incorporated into the Earth Dreams engines. Depending on driving conditions, it optimises valve timing to improve fuel efficiency and power output.
• Direct Fuel Injection: This system delivers fuel directly into the combustion chamber, leading to better fuel atomisation, improved efficiency, and reduced emissions.
• Continuously Variable Transmission (CVT): Honda pairs many Earth Dreams engines with a CVT for smoother power delivery and improved fuel efficiency, especially in stop-and-go traffic.

While these innovations are theoretically superior to the Earth Dreams engines, they have also led to specific issues. These most notably involve oil dilution, carbon build-up, turbo lag, and transmission reliability.

Common Problems with Honda Earth Dreams Engines

1. Oil Dilution in 1.5-litre Turbocharged Engines

Oil dilution is one of the most widely reported issues with Honda’s Earth Dreams engines, particularly the 1.5-litre turbocharged variant. This issue has been reported primarily by owners of the Honda CR-V and Honda Civic models equipped with this engine, and it has raised serious concerns regarding the engine’s long-term reliability.

What is Oil Dilution?

Oil dilution occurs when unburnt fuel leaks into the engine’s oil system, causing the oil to become diluted. In normal engine operation, fuel should be fully combusted in the combustion chamber. However, in certain driving conditions, particularly in colder climates or short journeys, some unburnt fuel can slip past the piston rings and mix with the engine oil in the crankcase.

Consequences of Oil Dilution:

• Decreased Oil Viscosity: Mixing fuel with oil thins out the engine oil, making it less effective at lubricating engine components.
• Increased Wear and Tear: Poor lubrication accelerates wear on critical components such as pistons, camshafts, and crankshafts.
• Potential Engine Failure: Prolonged oil dilution can result in severe engine damage, including premature failure of crucial engine parts.
• Cold Climate Impact: Owners in colder regions have reported that the issue is more pronounced in cold weather, as the fuel fails to evaporate adequately from the oil, exacerbating the dilution problem.

Owner Experiences: Many owners have reported engine warning lights appearing, especially in cold weather, with oil levels rising due to the dilution of the oil with fuel. Some even claim that the diluted oil causes a fuel smell in the cabin.

Honda’s Response: In response to numerous complaints, Honda issued a Technical Service Bulletin (TSB) in 2018 to address the issue. The TSB included software updates for the engine and the climate control system to help improve the engine’s warm-up time and prevent excess fuel from entering the oil. Additionally, Honda extended the warranty for affected vehicles, offering repairs under warranty. However, some owners argue that these fixes have only marginally improved the issue and have not been entirely resolved.

2. Carbon Build-Up on Intake Valves

Another common issue with Honda’s Earth Dreams engines, particularly those with direct fuel injection (DFI), is carbon build-up on the intake valves. This problem is common across many direct injection engines, not just Honda’s. Unlike traditional port injection engines, where fuel is sprayed into the intake manifold (cleaning the valves as a byproduct), direct injection sprays fuel directly into the combustion chamber, bypassing the intake valves altogether. As a result, these valves can accumulate carbon deposits over time.

Symptoms of Carbon Build-up:

• Decreased Power: Carbon build-up can restrict airflow into the engine, resulting in reduced power and throttle response.
• Poor Fuel Efficiency: A clogged intake system reduces the engine’s efficiency, causing higher fuel consumption.
• Engine Misfires: In severe cases, carbon build-up can cause the engine to misfire, triggering the check engine light.
• Rough Idling: Engines may idle roughly or have difficulty starting, especially in colder weather.

Preventative Measures: Regular maintenance is crucial to avoid carbon build-up. Honda recommends using high-quality fuel with detergents that help minimise deposit formation. Additionally, owners can perform walnut blasting, a process in which walnut shells clean the carbon off the intake valves. This is a standard maintenance procedure for direct injection engines, though it adds additional maintenance costs.

Honda’s Solution: Honda has not provided an official solution for carbon build-up, as it is considered a byproduct of direct injection engines in general. However, they recommend closely following the manufacturer’s maintenance schedule and using fuel additives to reduce carbon deposits.

3. Turbocharger Lag and Reliability Issues

Turbocharged engines in the Earth Dreams lineup, such as the 1.5-litre and 2.0-litre turbo variants, offer impressive power and efficiency. However, turbo lag—the delay between pressing the accelerator and feeling the turbocharger boost—has been a complaint among some Honda owners.

Turbo Lag Symptoms:

• Sluggish Low-Speed Performance: Drivers may notice a lack of responsiveness when accelerating from a stop or at low speeds.
• Delay in Power Delivery: The time it takes for the turbo to spool up can delay the car’s acceleration, making it less responsive than naturally aspirated engines.

Turbocharger Failures: Some owners have reported turbocharger failures in more severe cases, though this issue is less common than oil dilution or carbon build-up. Turbo failure can be caused by various factors, including insufficient lubrication (linked to oil dilution), poor maintenance, or driving the vehicle aggressively before the engine has fully warmed up.

Solutions:

• Proper Maintenance: Regular oil changes and using the correct oil viscosity can help prevent turbocharger issues. Following Honda’s maintenance schedule, especially for turbocharged engines, is essential.
• Driving Habits: Properly warming the engine up before driving aggressively and cooling the turbo down after a long drive can prolong the turbocharger’s life.
• Extended Warranties: In some cases, Honda has covered turbocharger repairs under extended warranties for vehicles affected by oil dilution.

4. Continuously Variable Transmission (CVT) Problems

Many Honda Earth Dreams engines are paired with a Continuously Variable Transmission (CVT), which helps improve fuel efficiency and provides smoother acceleration. However, Honda’s CVTs have faced several reliability concerns.

Common CVT Issues:

• Shuddering: Owners have reported that the CVT can cause the vehicle to shake or jerk, mainly during low-speed acceleration or when climbing hills.
• Delayed Engagement: Some drivers have experienced a delay in the CVT engaging when shifting from reverse to drive, causing a momentary pause before the car begins to move forward.
• Overheating: In extreme conditions, such as towing or driving in scorching climates, the CVT can overheat, causing the transmission to enter a limp mode to protect itself.

Honda’s Response: Honda has issued software updates to address the shuddering issue. The company recommends regular CVT fluid changes to help mitigate overheating and transmission wear. In addition, Honda offers an extended warranty for certain models to cover CVT repairs.

Owner Experiences: Some owners feel the CVT detracts from the overall driving experience due to its sluggish performance and reliability concerns. While the CVT provides excellent fuel efficiency, its long-term durability remains a question for some Honda owners.

Extended Concerns: Lawsuits and Honda’s Reputation

Despite Honda’s efforts to address these problems, the Earth Dreams engine series has been the subject of multiple class action lawsuits in the United States and other regions. These lawsuits primarily focus on the oil dilution issue, alleging that Honda failed to properly inform customers about the potential risks and long-term damage associated with this problem.

While Honda has provided solutions such as software updates, repairs, and warranty extensions, the ongoing complaints suggest that the underlying issues have not been fully resolved for all affected vehicles. This has caused some damage to Honda’s reputation, particularly among loyal customers who expected better long-term reliability from their vehicles.

Maintenance and Prevention Tips for Honda Earth Dreams Engines

Despite the abovementioned problems, many owners have enjoyed trouble-free performance with their Earth Dreams engines by adhering to a strict maintenance schedule and following best practices. Here are some tips to keep these engines running smoothly:

1. Regular Oil Changes: Given the potential for oil dilution, frequent oil changes are crucial. Use high-quality synthetic oil and follow Honda’s recommended change intervals.
2. Monitor Oil Levels: Check your oil level frequently, especially in colder climates. If it rises unexpectedly or if you detect a fuel smell, it’s essential to have your vehicle inspected.
3. Use Top-Tier Fuel: High-quality fuel with detergent additives can help reduce carbon build-up on the intake valves, improving engine performance and longevity.
4. Proper Turbo Warm-up and Cool-down: Allow your engine to warm up before driving aggressively, and avoid shutting it off immediately after a long or high-speed drive to give the turbocharger time to cool.
5. Stay on Top of Recalls and TSBs: Look for any new recalls or technical service bulletins related to your vehicle. Honda may issue software updates or repairs to address emerging issues.

Conclusion

Honda’s Earth Dreams engines represent a significant leap forward regarding fuel efficiency, performance, and environmental consciousness. However, these benefits have come at a cost, as some advanced technologies, like turbocharging and direct injection, have introduced new challenges for long-term reliability. The most significant issues reported by owners include oil dilution, carbon build-up, turbo lag, and CVT reliability.

While Honda has taken steps to mitigate these problems through software updates and extended warranties, the issues have not been eliminated for all vehicles. For current owners, following a rigorous maintenance schedule and staying informed about potential fixes is essential to maximising the lifespan of their Honda Earth Dreams engine. Prospective buyers need to be aware of these concerns and consider them when choosing a Honda model equipped with this technology.