What Are the Causes of Car Idling Issues?
1 Answers
Car engine idling issues can be caused by intake manifold leaks; excessive carbon buildup in the throttle body; faults in the intake system components; fuel system malfunctions; ignition system failures, etc. Gasoline vapor and combustion exhaust gases entering the intake manifold can result in an overly rich or lean air-fuel mixture, leading to unstable car idling. Excessive carbon deposits on the throttle body and surrounding intake passages alter the cross-sectional area of the air channels, preventing the control unit from precisely regulating the idle air intake. This can also cause the air-fuel mixture to become too rich or lean, resulting in unstable car idling. Faults such as clogged fuel injectors, blocked fuel filters, obstructed fuel pump screens, malfunctioning fuel pressure regulators, or clogged return fuel lines can lead to incorrect fuel injection quantities, causing the air-fuel mixture to become too rich or lean and resulting in unstable car idling. Issues like faulty ignition modules, incorrect spark plug gaps, eroded or damaged spark plug electrodes, or excessively high resistance in high-voltage wires can reduce ignition spark energy or cause misfires, leading to erratic car idling that fluctuates between high and low. Owners should take their vehicles to a professional repair shop for inspection, cleaning, replacement, or repair of the engine module.
