Why is the fuel consumption high during startup?
2 Answers
High fuel consumption during startup is due to the instantaneous fuel consumption when the car starts, which can reach 30-40 liters/100km. The fuel consumption then gradually decreases to normal levels while driving. Even rapid acceleration on the road won't result in such high fuel consumption again. Here are some methods to reduce fuel consumption: Clean engine carbon deposits: Excessive engine carbon deposits are a significant cause, mainly due to the use of unsuitable fuel. It is recommended to add a certain amount of cleaning agent when refueling, and after cleaning, it's best to drive at high speed for a while, which helps increase exhaust volume and allows stronger airflow to remove larger carbon deposit particles. Check the oxygen sensor: As an internal control unit of the car, the oxygen sensor mainly monitors the air-fuel ratio of the engine. Once it is damaged, it will cause an imbalance in the engine's air-fuel ratio, leading to a sudden increase in fuel consumption.
I'm all too familiar with high fuel consumption during startup. I've noticed it while driving. It mainly depends on whether it's a cold start or a warm start. During a cold start, the engine temperature is low, and the fuel injection volume increases to ensure smooth ignition, naturally raising fuel consumption. Engine carbon buildup is particularly critical—a dirty throttle body or aging spark plugs can reduce combustion efficiency, leading to insufficient power during startup, and the ECU compensates by injecting more fuel. I recommend checking if the air filter needs replacement, as insufficient air intake can also increase fuel consumption. Additionally, low tire pressure can increase rolling resistance during startup, contributing to the issue. Frequent short trips in the city make this problem more likely, as the engine often operates at low temperatures. Regular highway driving or throttle body cleaning can help alleviate the issue, and in terms of driving habits, avoid stomping on the accelerator during startup.
