Reasons for Poor Car Idling

1 Answers
BennettFitz
07/29/25 7:23pm
Reasons for poor car idling: 1. Intake manifold or various valve leaks; 2. Excessive carbon buildup in the throttle body and intake passages; 3. Malfunction of idle air actuators; 4. Fuel injector failure; 5. Fuel pressure issues; 6. Incorrect fuel injection quantity; 7. Spark plug and high-tension wire faults. Methods to check poor car idling: 1. Inspect all intake system pipe connections, vacuum hoses, exhaust gas recirculation system, and fuel vapor recovery system for leaks; 2. Check whether the idle control valve is functioning properly; 3. Examine electrodes for wear or carbon buildup and verify the spark plug electrode gap is normal.
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