What Causes Severe Vibration When the Air Conditioner is Turned On in an Accord?

[DiConnor]

Here are the reasons why an Accord may vibrate severely when the air conditioner is turned on: 1. Check the refrigerant pressure of the air conditioner: If the refrigerant pressure is too high, it may cause the engine idle to be unable to handle the load. 2. Excessive engine carbon buildup: Inspect and clean the fuel system, injectors, throttle body, idle air control valve, and intake manifold if there is excessive carbon buildup. 3. Check if the initial fuel pressure is too low: Due to prolonged parking, the fuel system pressure may be too low or the fuel pressure regulator may not maintain pressure properly, making it difficult to establish the standard fuel pressure instantly, which can lead to insufficient cold-start fuel injection and poor starting. 4. Inspect the air filter: Check if the air filter is too dirty, affecting the quality of the intake air, which can result in insufficient air volume during startup.