What is the situation when the engine makes a ticking sound at hot idle but not at cold idle?

1 Answers
DelAlexa
07/30/25 1:27am
It is normal for the engine to make a ticking sound at hot idle but not at cold idle. Here is an introduction to idle conditions: 1. Introduction: Idle is a working condition of a car, referring to the engine running in neutral. 2. Classification: (1) Normal idle: When the vehicle is in a parked state and the engine is started, the lowest stable engine speed is called parking idle. (2) Driving idle: When the car is in gear, without pressing the accelerator pedal or releasing the accelerator pedal while driving, maintaining the minimum throttle opening, the engine speed is the same as the parking idle, which is called driving idle. (3) Unstable idle: Unstable idle is the most common fault encountered in engine maintenance. If the diagnostic approach is incorrect, it may prolong repair time, reduce work efficiency, or even cause the car owner to become impatient and switch to another repair shop.
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