Regan Brown
If you've noticed that your diesel car is using more fuel, there could be several reasons for this. One of the main reasons could be your driving habits and the type of roads you drive on. For example, if you're mostly driving in the city with frequent stops and heavy traffic, your fuel economy will be lower compared to driving on highways with higher speed limits and fewer interruptions. Additionally, your driving techniques can impact fuel efficiency. Accelerating and decelerating gently, maintaining a constant speed, and avoiding excessive idling are all part of eco-driving, which helps optimize fuel efficiency. Other factors that can contribute to higher fuel consumption include a dirty fuel system, low tire pressure, a failing turbocharger, and old engine oil. Keeping your car well-maintained and adopting fuel-efficient driving practices can help improve your diesel car's fuel economy.
Why is my diesel car using more fuel?
| Characteristics | Values |
|---|---|
| Dirty fuel system | Filters, injectors, valves, and piston heads |
| Non-alloy wheels | Adds more weight to the tyres |
| Low tire pressure | Creates more rolling resistance |
| Poor wheel alignment | Causes uneven tire wear and increased rolling resistance |
| Failing turbocharger | Reduces power, causes excessive exhaust smoke, unusual noises, and illuminates check engine light |
| Driving habits | Driving in towns or cities, harsh braking, speeding, and excessive idling |
| Old oil | Oil not changed in recent past |
| Faulty parts | Oxygen sensors, air filters, spark plugs, and fuel injectors |
| Over-inflation or under-inflation of tires | Negatively influences fuel consumption |
| Air conditioning | Strains the engine |
| Transmission | Using incorrect gear |
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What You'll Learn
Driving habits and location
Eco-driving techniques can help optimize fuel efficiency. This includes gentle acceleration and deceleration, maintaining a constant speed, and avoiding excessive idling. Planning your trips to avoid peak traffic times and choosing routes with fewer stops can also improve fuel economy. Additionally, if you anticipate being stopped for more than a minute, it is more fuel-efficient to turn off your engine and restart it when you're ready to move again.
The location and environment of your drives can also impact fuel efficiency. For instance, driving in hot weather and using air conditioning can strain your engine and reduce fuel efficiency. In such cases, cracking a window can help maintain a comfortable temperature without sacrificing fuel economy.
Furthermore, proper maintenance of your vehicle is essential. Regularly checking and maintaining correct tyre pressure is crucial, as underinflated tyres increase rolling resistance, requiring your engine to work harder and consume more fuel. Similarly, proper wheel alignment ensures even tyre wear and reduces rolling resistance, contributing to better fuel efficiency.
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Dirty fuel system
Dirty fuel injectors can cause a variety of issues, including engine misfires, rough idling, and engine stalling. Dirty injectors can also cause the engine to feel like it is sputtering and send vibrations through the car. This is because dirty fuel injectors mess with the engine's internal combustion processes.
Dirty fuel can also cause premature equipment failure. This is especially true for newer equipment with High-Pressure Common Rail (HPCR) fuel systems. Hard particulate, often referred to as "dirt", can be made up of a variety of materials, including rust, corrosion, and carbonaceous materials. These particulates can cause problems with the moving parts in the fuel system, leading to starting problems, poor engine performance, and even complete engine failure.
To prevent dirty fuel injectors, it is important to regularly clean and maintain the fuel system. This can be done through the use of treatments, such as LIQUI MOLY, that are poured directly into the fuel tank. It is also important to keep the fuel tank relatively full, as this can help to prevent an increase in the particulate-to-fuel ratio and reduce the risk of water contamination.
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Low tire pressure
Maintaining the correct tire pressure is essential for optimizing fuel efficiency and can save you a significant amount of money annually. It is recommended to check your tire pressure at least once a month and more frequently during significant weather changes. You can find the recommended tire pressure for your vehicle in the owner's manual or on a sticker located on the driver's side door jamb.
By keeping your tires properly inflated, you not only improve fuel efficiency but also enhance the handling and safety of your vehicle. Underinflated tires can increase your braking distance and reduce the responsiveness of your vehicle's handling, increasing the risk of accidents, especially in challenging driving conditions. Additionally, underinflated tires can overheat due to excessive friction with the road, leading to a higher risk of tire blowouts, particularly at high speeds.
It is also important to note that overinflating your tires to improve fuel mileage can be counterproductive. While higher tire pressure reduces rolling resistance, it can lead to uneven tire wear, causing you to replace your tires prematurely. Therefore, it is crucial to maintain the recommended tire pressure for your vehicle to strike a balance between fuel efficiency and tire longevity.
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Failing turbocharger
A failing turbocharger can be a significant reason for the loss of fuel economy in a diesel vehicle. Turbochargers are designed to increase the efficiency and power output of the engine by forcing extra air into the combustion chamber. This way, a turbocharged engine can achieve greater torque output at lower engine speeds.
When the turbocharger is not functioning properly, the engine struggles to achieve optimal performance, resulting in increased fuel consumption. This increased consumption is due to the engine burning a high amount of fuel to generate more power. Signs that your turbocharger may be failing include a reduction in power, excessive exhaust smoke, unusual noises such as whining or rattling, and an illuminated check engine light.
To optimize the fuel economy of a turbocharged diesel engine, it is important to practice driving at lower speeds and anticipating traffic. Additionally, regular servicing of the car, including oil changes and filter replacements, is crucial. It is also beneficial to "warm up" and "cool down" the engine, especially when driving in harsh conditions.
Furthermore, maintaining proper tyre pressure and alignment is essential for fuel efficiency in turbocharged diesel vehicles. Underinflated tyres create more rolling resistance, requiring the engine to work harder and use more fuel. Proper alignment ensures that the tyres are working efficiently and enhances the overall handling and safety of the vehicle.
By addressing these issues and following eco-driving techniques, such as gentle acceleration and maintaining a constant speed, you can significantly improve the fuel economy of your turbocharged diesel vehicle.
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Wheel alignment
There are many reasons why your diesel car may be using more fuel. One reason could be improper wheel alignment, which can lead to increased rolling resistance. This resistance opposes the forward motion of your vehicle, forcing the engine to work harder and, in turn, use more fuel.
Caster, Camber, and Toe
During a wheel alignment service, technicians adjust three main settings: caster, camber, and toe. The caster angle helps balance steering, stability, and cornering. A misaligned caster can make steering heavy and reduce fuel efficiency. Camber refers to the inward or outward tilt of the tire when viewed from the front. Incorrect camber causes uneven tire wear and affects the vehicle's handling and cornering. Toe refers to how the tires turn inward or outward when viewed from above. An improper toe setting can cause the tires to roll in a non-parallel fashion, leading to increased tire wear and reduced fuel efficiency.
Benefits of Regular Wheel Alignment
Regular wheel alignment checks offer several benefits:
- Improved Fuel Economy: Proper alignment reduces rolling resistance, allowing your vehicle to operate more efficiently and consume less fuel.
- Extended Tire Life: Proper alignment helps prolong the life of your tires by ensuring even tread wear.
- Enhanced Handling and Performance: Properly aligned wheels improve vehicle handling, making driving smoother and more comfortable.
- Safety: Proper alignment improves vehicle safety by enhancing handling and traction.
- Reduced Costs: Regular wheel alignment can help prevent costly issues down the line and reduce overall maintenance expenses.
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