Symptoms of poor throttle timing control

1, the engine idle speed is unstable, the high idle speed drops discontinuously, and it is difficult to start the engine, especially the cold start; 2, the engine idle speed instability or no idle speed; 3. The engine is difficult to start; 4. The engine has insufficient power, poor acceleration performance and unstable operation. 5. The exhaust pipe of the car emits black smoke, which increases fuel consumption.

How to judge that the throttle is broken? The most accurate method is to check the throttle with a scan tool and observe the data flow. If the throttle opening is large, it must be cleaned. If it is determined that the fault of the throttle valve is permanent, it must be replaced. Generally, the throttle cannot be disassembled for maintenance, only the assembly can be replaced.