What Causes Unstable Idle Speed?
1 Answers
There are many reasons for unstable idle speed, which are detailed below: 1. Intake manifold or various valve leaks: When unwanted air, gasoline vapor, or exhaust gases enter the intake manifold, it causes the air-fuel mixture to become too rich or too lean, leading to abnormal engine combustion. 2. Excessive carbon deposits in the throttle body and intake passages: Too much carbon buildup or dirt in the throttle body and surrounding intake passages alters the cross-sectional area of the air passage, preventing the control unit from precisely regulating idle air intake. This results in an overly rich or lean mixture, causing abnormal combustion. 3. Malfunction of idle air control components: Faulty idle air control components lead to inaccurate idle air regulation.