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Over-fuel consumption: the main causes

nicad 30/07/2021 1150

Over-fuel consumption: the main causes

Contents 1. An insufficiently maintained engine Imperfect engine carburetion Too old spark plugs An old clogged air filter Unsuitable or poor quality engine oil And many other reasons ... 2. Accessories that increase consumption 3. Using the wrong tires and ignoring them 4. Incorrectly adjusted brakes constantly brake!

1. An insufficiently maintained engine

Imperfect engine carburetion

For optimal operation of your engine, it is essential to have good carburetion. Carburetion is the mixture of air and gasoline during engine operation. If it's bad (too much air, not enough gasoline, or too much gasoline and not enough air), your car is running poorly, consuming more and polluting more. It is therefore important that the carburation is optimal, and it is also directly linked to the quality of the air received (cf. 3. a clogged air filter).

In the event of imperfect carburetion, it is You will have to take your car to the garage, so that an injection adjustment is carried out, or work on the air / fuel ratio applied to the engine ECU. This is also what tuners do when reprogramming the engine. For older cars with mechanical carburettors, you will need a professional to manually adjust the carburetor.

The injection settings are often updated by the manufacturers, who optimize the maps injection of your car sometimes even after several years. Ask your garage about these operations. Injection problems are not a big deal today, especially since the ignition is also electronically controlled. Always prefer quality fuels to avoid worries, and in case of problems, consult an expert!

An air filter sucks in several thousand liters of air per minute! An air filter lets a lot through of air for your engine, approximately 2000 liters / min for a city car. In comparison, a human being consumes an average of 12,000 per day, or the equivalent of 6 minutes for a car! With a dirty filter, it therefore risks "asphyxiation". Avoid this, especially in summer and in dusty and polluted areas!

Too old spark plugs

On your car, you must have spark plugs in good condition. Spark plugs are the keystone of a well-functioning engine. They allow good combustion, reinforced on gasoline or gas cars. It is recommended by the manufacturers to change them during major interventions on your car (on average every 50 to 60,000 km), during an overhaul. Bad spark plugs therefore create combustion problems, and therefore a drop in engine performance and a possible increase in fuel consumption.

Easily accessible on many cars, they are controllable in the event of misfires your car or having difficulty starting. Darkened or damaged candles at the base are a sign of a poor job of combustion and of candles to be replaced. Without a spark plug, an engine cannot run!

An old clogged air filter

An engine draws on fresh air from outside, and the air filter helps retain dirt and dust air, to deliver the purest air possible to your engine. The most common filters are made of paper, and should be changed during maintenance of your car.

If it is not changed in due time or if it is too old, your air filter will clog and allow particles to pass into the engine. Combustion will be poor, performance will be reduced, and consumption will increase.

A new air filter costs less than 10 € and will allow you to obtain quality filtration!

An engine oil unsuitable or of poor quality

Your engine runs on oil, which constantly lubricates the engine so that it does not get damaged and runs smoothly. But with old or unsuitable oil for your engine, apart from the risk of part breakage, your actual consumption could well skyrocket.

It is important to check that your oil corresponds to the manufacturer's recommendations, available in your maintenance book. The right oil, with the right viscosity, will protect your engine mile after mile. If you buy a used car, make sure the oil changes were done on time, as the oil loses its properties over time, and the engine may have suffered from poor lubrication. Pay attention to your oil!

And many other reasons ...

An engine is fine mechanics and works thanks to the harmony of several factors. If they are disturbed, its entire functioning suffers, and therefore it will consume more and more. For example, if you have a diesel car with a DPF (particulate filter) it can get dirty. This will prevent the proper flow of exhaust gases, and therefore overconsumption. Other factors still exist, so take good care of your mechanics to avoid the hassle!

2. Accessories that increase fuel consumption

Many accessories or comfort options can negatively impact your fuel consumption. Here are a few:

Air conditioning: it works thanks to a compressor driven by a belt, which takes its force from the engine. When you turn on the air conditioning, you increase the effort required of the engine. This results in a consumption that can rise by more than 10%. Electrical accessories: all electrical accessories, if they create a high consumption, can indirectly impact the consumption of your car. (heated seats, heated windshield or rear window, sound system, gps, additional lights, etc.) Transport accessories (roof racks, roof rack, bicycle rack): all the accessories to increase transport capacities of your car, if they are mounted on the outside of the car, will increase your consumption sometimes very significantly. They increase the weight of the car and its resistance to air, thereby increasing engine effort and therefore consumption! Styling accessories: styling or tuning accessories such as fins can lead to overconsumption because they apply additional downforce to the car on the road, which increases its resistance to wind. Rolling the windows open at high speed: this is not an accessory, but a driving habit. Windows open to the national road generate overconsumption at least equal to air conditioning. Good to know!

The accessories are still numerous, be sure to understand if they can increase your consumption before installing them on your car!

3. Using the wrong tires and not being careful

Choose the right tires for your car

It is important to use the right tires for your car and the season. For example, if you use winter tires or off-road tires in the middle of summer, they will tend to wear out faster and increase fuel consumption, because their rubber is softer and their preferred use is not. burning bitumen. In this case, prefer summer tires or 4 seasons in the summer period in order to reduce your consumption.

To reduce the friction of the tires on the asphalt, and therefore reduce the fuel consumption of your car , choose “green” tires (energy A or B).

Check your tire pressure often

To avoid the risk of overconsumption, it is necessary to check the tire pressure on a regular basis. Check them about every 3 weeks!

A tire deflates faster when you are not using your car, it will deflate less quickly if you use your car every day. When deflated, the tire's ground contact surface increases, greatly increasing its resistance to the road. This affects the performance of your car, handling, braking and fuel consumption. So it's very negative. If they are worn, your tires will also have to be changed.

To optimize your consumption, especially if your car is loaded, you can apply a very slight over-inflation to your tires, compared to the manufacturer's recommendations ( for example, +0.2 bar). Be careful not to over-inflate your tires, as this can adversely affect on-board comfort, but also road holding and tire resistance.

Tires are one of the essential elements of your Safety The tires are the only surfaces of your car in contact with the road (except for anomalies ^^). Never forget it! Hence the importance of maintaining them and checking them often. The tightness of a tire is never perfect and a tiny amount of air always escapes from it. In the event of a hernia on the sidewall, or severe use, change your tires without hesitation, and always by train (front or rear) at least.

4. Incorrectly adjusted brakes constantly brake!

When your brakes are poorly maintained or have not been checked for a while, you risk that one or more of them will brake. constantly, even if you don't brake. Even if it is sometimes imperceptible, it does have an impact on consumption. This can come from the adjustment of the brake caliper, the brake pads, the condition of the disc or the brake system itself.

The official scale of the ecological bonus-malus for the year 2019 has been released. The goal of the ecological penalty is to reduce the number of vehicles with high carbon dioxide (CO2) emissions. So remember to check the elements mentioned above in order to reduce your fuel consumption as well as the amount of the ecological penalty. You want to find a vehicle that consumes less? Check out our used car catalog.

If you hear or smell anything suspicious while driving, especially at low speed, do a check or ask your mechanic when putting on the deck. check your 4 wheels!

We have reviewed many of the possible causes of overconsumption, but do you have others that we have not answered? React in the comments 🙂

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