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Fast Idle Control Device

The FICD is a type of secondary solenoid which when opens allows a specific amount of additional air to enter it.

 

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A mechanism on the fuel metering system which automatically increases the idle speed of the engine in response to certain conditions like such as when the engine is cold or when it is placed under increased loads, otherwise the car might get stall is called A Fast Idle Control Device (FICD).

Air – conditioning increases the load on engine by quite a factor especially at low speeds, the FICD will sense whether the AC is on or not and set the idle speed accordingly. The main purpose of the FICD is to raise the idle immediately while turning on the A/C compressor or even when the pump of power steering is under heavy load (for example, steering the wheel while idling). To compensate for the added load of accessories an additional idle speed is provided to help the engine rather than simply stalling out.

A similar device known as an idle speed control actuator is used in carbureted vehicles. Although the FICD is supposed to last as long as the vehicle but for various reasons it may fail/ malfunction prematurely. The most common failure is jamming of valve which can either be partial/ complete which is due to dirt/ dust or even oil where it cannot be smoothly controlled. Consequently we get an engine which is very rough and stalls frequently. A (only) jammed valve can easily be restored by simply cleaning it. However the failure or stoppage in working can be due a fault in the solenoid which might imply that the solenoid needs a replacement.

 

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