* Idle air control valve (IACV): The IACV is responsible for controlling the amount of air that bypasses the throttle body, which helps to regulate the idle speed. When the AC is on, the IACV needs to open further to allow more air to flow into the engine, which can cause the idle speed to fluctuate.
* Vacuum leaks: Vacuum leaks can also cause the idle speed to fluctuate, especially when the AC is on. This is because the AC compressor creates a vacuum, which can draw air into the engine through any leaks.
* Throttle body: The throttle body is responsible for controlling the amount of air that flows into the engine. If the throttle body is dirty or damaged, it can cause the idle speed to fluctuate.
* MAF sensor: The MAF sensor measures the amount of air that flows into the engine. If the MAF sensor is dirty or damaged, it can send incorrect signals to the engine computer, which can cause the idle speed to fluctuate.
If you are experiencing erratic idle with the AC on in your 1994 Honda Accord, it is recommended that you have the vehicle inspected by a qualified mechanic to diagnose the cause of the problem and recommend the appropriate repairs.
