Passat's idle speed is unstable

First, the throttle and air flow meter have too much carbon.

Throttle and air flow meter are easy to get dirty. Now most cars are electronic throttles, which may be affected by a little carbon deposition. Too much carbon deposition in the throttle will lead to the throttle being stuck, the power will be seriously reduced and the idle speed will be unstable.

Dirty air flow meter leads to wrong air flow signal, and the intake determines the fuel injection quantity, which directly leads to inaccurate fuel injection, which not only increases fuel consumption, but also seriously lacks power! Therefore, it is very important to replace the air filter. Don't forget to clean it every 30,000 kilometers.

Second, the cylinder combustion chamber and piston have too much carbon deposition.

There is too much carbon in the cylinder combustion chamber, which will have a certain adsorption effect on gasoline! So when the ignition starts, the time will be slightly extended. In addition, too much carbon deposits are mostly formed on the valves and piston rings, which indirectly leads to insufficient cylinder pressure, and it is easy to idle unsteadily when the cold car is started, and the hot car can solve the problem.

Extended data

The change of the gas force in the cylinder (the change of the gas force in one cylinder or several cylinders) causes the power imbalance of each cylinder, which leads to the inconsistency of the horizontal component force of each piston during the power stroke, resulting in the torque imbalance of the lateral rocking engine, thus producing engine jitter.

It can also be said that any fault that causes the change of air force in the engine cylinder may lead to engine idling jitter.

People's Network-The idle speed of the cold car is unstable and the gasoline smells heavy! Do you know why?