What are the reasons for the sudden increase in fuel consumption of the Qashqai?

[LeSavannah]

After a certain period of use, wear and tear on car components and the accumulation of carbon deposits inside the engine can easily lead to higher fuel consumption. If not addressed in time, this can result in increased fuel costs and potential damage to the vehicle. The sudden increase in fuel consumption of the Qashqai may be due to the following reasons: 1. The air filter is too dirty, reducing the amount of air entering the engine cylinders, leading to insufficient oxygen for combustion and excessive intake vacuum, causing incomplete gasoline combustion. Replacing the air filter can resolve this issue. 2. Excessive carbon deposits on the fuel injectors and throttle body can lead to poor gasoline atomization and incomplete combustion, resulting in higher fuel consumption. Cleaning the carbon deposits will restore fuel consumption to normal levels in the short term. 3. Poor-quality gasoline can form carbon deposits in the combustion chamber or around the valve ports. These deposits cause the engine to inject more fuel during operation, leading to increased fuel consumption. 4. A faulty ignition coil can result in insufficient ignition energy, incomplete combustion, and higher fuel consumption.

[Mandy]

I've been driving the Qashqai for three years and recently encountered a sudden increase in fuel consumption. First, I checked the tire pressure and found that both the front and rear tires were underinflated. The standard pressure should be 230 kPa, but it was only around 190 kPa. Insufficient tire pressure increases rolling resistance. Then, I inspected the air filter, which was clogged with dust. Poor airflow makes the engine work harder and burn more fuel. Additionally, my driving habits changed recently—more sudden accelerations and higher speeds on the highway, which directly pushed up fuel consumption. I recommend checking these basic items yourself first. Timely maintenance can save a lot on fuel costs, and developing good habits in daily driving can help avoid such issues.

[JayceRose]

Frequently dealing with car maintenance, there are several common reasons for a sudden increase in fuel consumption in the Nissan Qashqai. Insufficient tire pressure increases friction, leading to higher fuel consumption; a dirty air filter restricts air intake efficiency, causing the engine to operate abnormally; worn or carbon-fouled spark plugs affect ignition efficiency, resulting in incomplete fuel combustion; fuel system issues such as clogged fuel injectors or insufficient fuel pump pressure can disrupt fuel supply. It's best to use a diagnostic tool to check ECU data and the oxygen sensor—just because the system warning light isn't on doesn't mean everything is fine. You can visually inspect the tires and air filter yourself, but for more complex issues, it's advisable to visit a professional repair shop for a thorough check.

[LeCalvin]

Driving the Qashqai, I noticed a sudden increase in fuel consumption. I wondered if it was due to frequently using the air conditioning recently, as heavy usage in summer does increase engine load. Alternatively, it could be low tire pressure causing higher rolling resistance, or a dirty air filter reducing airflow, making the engine burn more fuel. Sometimes, changes in road conditions, like frequent traffic congestion or aggressive braking and acceleration, can also consume more fuel. Start by checking these minor issues: use a tire pressure gauge to measure the tires—the standard value is usually around 230 kPa, and top up if necessary. Try cleaning or replacing the air filter, which might quickly resolve the problem.