What Causes High Idle Speed in a New Car?
1 Answers
High idle speed in a new car is caused by: excessive intake air during idling, excessive fuel injection, or incorrect engine control signals. Idling refers to the operation of the engine under no-load conditions, where it needs to overcome the frictional resistance of internal components and maintain the minimum speed for stable engine operation. The idle speed is adjusted by regulating the throttle opening size and the idle fuel supply. The hazards of high idle speed include: 1. Increased engine carbon deposits; 2. Shortened engine lifespan; 3. Overly rich air-fuel mixture in the engine, which can easily damage the three-way catalytic converter; 4. Loosening of the vehicle's braking system, increasing the risk of accidents; 5. Increased exhaust emissions from the vehicle's cylinders.