What causes the idle speed to fluctuate when the air conditioning is on?
1 Answers
When the air conditioning is turned on, the engine load increases. If there are any issues with the vehicle, it may lead to unstable idle speed, causing the RPM to fluctuate. Common causes include the following: 1. Excessive carbon buildup: Severe carbon deposits inside the engine can cause idle speed fluctuations when the air conditioning is on. 2. Ignition system issues: It's necessary to check the vehicle's spark plugs and high-voltage wires. If the ignition system is not functioning properly, it can lead to this situation, resulting in unstable idle speed. 3. Unstable fuel system pressure: If the fuel pump cannot supply fuel to the vehicle properly, it may cause poor fuel atomization or failure to open the fuel injectors, leading to idle speed fluctuations when the air conditioning is on.