What Causes Low Car Idle Speed?

1 Answers
Raquel
07/29/25 3:52pm
Reasons for low car idle speed include: 1. Oil residue and carbon buildup in the throttle body, or dirty intake passages; 2. Weak spark due to faulty spark plugs; 3. Fuel system blockages such as clogged fuel injectors or intake pipe malfunctions; 4. Faulty sensors, among other potential causes. Idle speed is designed to overcome the engine's internal resistance and maintain minimum RPM, providing convenience for drivers during various driving conditions and temporary stops. For instance, when waiting at traffic lights or in congested areas, briefly turning off the engine can contribute to energy savings and emission reduction, even if the duration is short.
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