What does unstable car idle speed mean?
1 Answers
Unstable car idle speed refers to the fluctuation of the tachometer when the engine is idling, accompanied by engine shaking. The reasons for unstable car idle speed are: 1. Air, gasoline vapor, or exhaust gas entering the intake manifold, causing the mixture to be too rich or too lean; 2. Ignition module failure, incorrect spark plug gap, spark plug electrode erosion or damage, excessive resistance in high-voltage wires; 3. Injector clogging, fuel filter clogging, fuel pump screen clogging, fuel pressure regulator failure, return pipe clogging, etc., leading to the mixture being too rich or too lean; 4. Failure or damage of the engine intake system's actuators; 5. Excessive carbon deposits on the throttle and surrounding intake passages, changing the cross-sectional area of the air passage, making it impossible for the control unit to precisely control the idle air intake.