What Causes High Idle Speed During Cold Start?

1 Answers
AdelynLynn
07/30/25 8:26am
Car starting with high idle speed has the following reasons: 1. Inefficient gasoline combustion, resulting in poor engine acceleration performance. 2. Neither the engine temperature nor the three-way catalytic converter has reached operating temperature. Relevant information about idle speed is as follows: 1. Introduction: Idle speed is an operating condition of a car, referring to the engine running in neutral gear. The engine speed during idle is called idle speed. Idle speed can be adjusted by modifying the throttle opening size, etc. Idle means the engine "produces power without doing work". 2. Driving idle: When the car is in gear, without pressing the accelerator pedal or releasing it during driving, maintaining the minimum throttle opening, the engine speed matches the parking idle speed. This state is called driving idle.
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