What Are the Reasons for Unstable Idle Speed in Diesel Vehicles?
1 Answers
Possible reasons include excessive cylinder leakage during idle, significant energy loss within the cylinders resulting in lower compression temperature and pressure, poor fuel atomization, and substantial combustion fluctuations. Below is relevant information about vehicle idle speed: 1. The function of vehicle idle speed: Idle speed is an operational condition of a vehicle, referring to the engine running in neutral gear. The engine speed during idle is called the idle speed. The idle speed can be adjusted by modifying the throttle opening size, among other methods. Idle speed means the engine "outputs power without doing work." When the engine is running, if the accelerator pedal is fully released, the engine enters idle condition. 2. Reasons for unstable idle speed: Direct causes refer to mechanical components being dirty, worn, or incorrectly installed, leading to variations in cylinder power output, which results in an imbalance of power among cylinders and consequently unstable engine idle speed. Indirect causes refer to abnormalities in the engine's electronic control system, causing poor combustion of the air-fuel mixture, making it difficult to balance the power output of each cylinder, and thus leading to unstable engine idle speed.
