Idle Speed Control Sensors
The idle speed is how many RPMs the engine completes when it is not in a driving gear. Most vehicles are within correct parameters if their idle speed is between 600-850 RPMs. Correct idle speeds for any given vehicle can be located on the emissions decal under the hood of the car or in the operator’s manual. Idle speed sensors detect demands upon the engine and adjust the idle speeds accordingly. If the engine is in high demand then the idle speed sensor will relay that information and the engine control unit will send signals for the idle to be adjusted. If the demand is lower, it is also adjusted downward. Problems with the idle control sensor might mean that the vehicle idles really high or really low at inappropriate times. It also might vary the idle rapidly creating a vroom, vroom, vroom like the accelerator is being pressed intermittently only when at idle.