Why is the fuel consumption of the old Tiguan so high?
2 Answers
The reasons for the high fuel consumption of the Tiguan are as follows: 1. There are many factors that can lead to excessive fuel consumption, such as poor driving habits (sudden acceleration, sudden braking, coasting in neutral, speed not matching the gear), low tire pressure, use of low-quality fuel, ignition system failure, and electronic control system failure. These issues can all increase the vehicle's fuel consumption. 2. If the vehicle is not maintained on time, such as not replacing the air filter, fuel filter, spark plugs, and clutch plates in a timely manner, it can also lead to increased fuel consumption. 3. Carbon deposits and faults in the electronic control system, such as carbon buildup in the throttle body, idle valve, and fuel injectors, or inaccurate signals from the oxygen sensor, air flow meter, and water temperature sensor, can all affect the vehicle's fuel consumption. A comprehensive inspection is necessary if the fuel consumption is too high. 4. If the vehicle has been regularly maintained at a 4S shop and still has high fuel consumption, the working condition of each component in the electronic control system should be thoroughly checked.
The high fuel consumption of the old Tiguan is mainly due to the relatively outdated engine technology, especially the early EA888 engine from Volkswagen, which is quite prone to oil burning issues. Excessive carbon buildup can affect combustion efficiency. Additionally, the transmission in older models, such as the 6AT, tends to be sluggish in shifting, leading to lower transmission efficiency and higher RPMs at low speeds in urban driving. The heavy body weight and increased friction resistance from worn tires also contribute. Aging sensors, like a faulty oxygen sensor, can cause the ECU to incorrectly increase fuel injection. Regular maintenance is crucial—I recommend periodic carbon cleaning, switching to full synthetic oil to reduce internal friction, timely replacement of spark plugs to ensure ignition efficiency, and maintaining tire pressure around 2.5 to save some fuel.
