10 Why doesn't Volkswagen Tiguan four-wheel drive work well?

1. First, check whether the oil nozzle is blocked, whether the oil pipe leaks oil, whether the power of the gasoline pump is reduced, and whether the gasoline filter is blocked, which will lead to weak acceleration of the car. If the air filter, throttle and other parts are blocked or have problems, resulting in insufficient air intake, it will also cause the car to accelerate weakly.

Secondly, the spark plug is also the source of common faults. If the spark plug is not ignited properly, it will lead to the problem of weak acceleration.

3, and then check the engine mechanical failure mainly refers to the cylinder pressure is too low, the reason is that the valve seal is not good, the cylinder liner piston wear is too large, and too much carbon deposition in the engine will also lead to weak acceleration. Clutch failure will lead to the phenomenon that the engine speed will increase when accelerating, but the vehicle speed will not increase.

4. Finally, the failure of exhaust system mainly refers to poor exhaust, which is caused by three-way catalytic crushing. Clogged exhaust pipes will cause engine power to drop.