What to Do When the Fuel Consumption of Haval H2 Keeps Increasing?

[SanMariana]

You can replace the spark plugs or clean the throttle valve to solve the problem. Here are the relevant details: 1. Haval: Haval is a sub-brand of Great Wall Motors, established on March 29, 2013. The Haval brand, primarily focusing on SUV models, operates in parallel with the Great Wall brand, using an independent logo and having its own product development, production, and service systems, mainly engaged in SUV production and sales. It includes three series: H series, M series, and F series. 2. Spark Plugs: Spark plugs are critical components of the ignition system in gasoline engines. They introduce high voltage into the combustion chamber and generate sparks by jumping the electrode gap, thereby igniting the combustible mixture in the cylinder. They mainly consist of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell.

[VanDawson]

Back when I was frequently driving long distances, my H2 also experienced a sudden surge in fuel consumption. Later, I found out it was due to a severe drop in tire pressure. After inflating all four tires to 2.5 bar, I saved nearly half a tank of fuel. Regular maintenance can't be neglected—if the air filter is clogged, the engine struggles to breathe and guzzles fuel, and blackened spark plugs should be replaced immediately. If you've recently driven on mountain roads, remember to clean the carbon buildup; pouring two bottles of fuel additive from the gas station and taking a high-speed run works wonders. If your trunk is packed with bottled water and toolboxes, clear them out—they're dead weight and waste fuel. If you've checked all these and fuel consumption is still high, chances are the oxygen sensor is clogged with carbon deposits. A quick trip to the repair shop to read the data stream will reveal the truth.

[GrantMarie]

Once, my best friend's H2's fuel consumption skyrocketed, and the issue turned out to be the air conditioning! If the refrigerant pressure is incorrect, the compressor will guzzle fuel like crazy. It's recommended to turn off the AC for a few days first to observe any changes in fuel consumption. Frequent short trips are also harmful—if the battery doesn't have enough charge, the alternator will constantly work to recharge it, naturally increasing fuel consumption. Try to drive for trips longer than half an hour regularly to let the engine warm up thoroughly. If you smell gasoline when checking the engine oil, the fuel injectors are likely leaking. The most easily overlooked issue is brake calipers not retracting properly—if the tires are dragging, it will definitely waste fuel. During maintenance, ask the mechanic to pay special attention to this.

[VanIsabela]

After upgrading to larger wheels last year, my fuel consumption increased by two, so I quickly switched back to the original size. Modifying the intake and exhaust can cause ECU data disorder, and once the factory tuning is disrupted, it will start injecting fuel excessively. If you install a roof rack or side steps, the wind resistance will increase sharply when driving on the highway. For daily driving, avoid hard acceleration and use cruise control more often. The latest car infotainment apps now display real-time fuel consumption curves. Pay special attention to whether the engine often operates in the low-speed, high-RPM range, as this is the most fuel-consuming state. It is recommended to upshift earlier or control the throttle depth.

[EloiseMarie]

Sensor failures are invisible fuel consumption killers. Aging front and rear oxygen sensors can cause air-fuel ratio imbalance, leading to long-term rich operation. Use an OBD scanner to check long-term fuel trim values - if it exceeds ±10%, immediate repair is required. A stuck charcoal canister purge valve allows fuel vapors to directly enter the intake, wasting fuel unnoticed. Simple check: when the engine is warm, disconnect the canister hose and block it - if idle becomes unstable, the valve is leaking. Transmission valve body pressure leaks cause sluggish shifting, where RPM rises but speed doesn't increase. This must be addressed promptly as it damages the vehicle and increases fuel consumption.

[Dante]

Hey, our fleet of ten H2s has a common issue: after 60,000 to 70,000 kilometers, the thermostat gets stuck in the normally open position, and the engine coolant temperature fails to rise, leading to continuous fuel enrichment! Be alert if the coolant temperature gauge on the dashboard struggles to reach the midline. Additionally, when the battery is nearing the end of its life, insufficient starting voltage can trigger the ECU protection program, causing a direct 30% increase in fuel injection to maintain operation. This kind of hidden loss is the most frustrating, but replacing the battery shows immediate results. In summer, when using the AC, it's recommended to open the windows for ventilation before turning on the cooling to avoid high-load startup of the compressor. Regularly clean fallen leaves and debris from the engine compartment—better heat dissipation naturally leads to lower fuel consumption.