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  2. Idle air control actuator - Wikipedia

    en.wikipedia.org/wiki/Idle_air_control_actuator

    The result is an engine that fails to maintain idle RPM and frequently stalls. A jammed actuator may be freed simply by cleaning it. However an actuator that has stopped working due to a fault in its servomotor will need replacement. Air leaks in either the stepper housing or pipes will cause elevated idle RPM.

  3. Carburetor - Wikipedia

    en.wikipedia.org/wiki/Carburetor

    The idle circuit is generally activated by vacuum near the (near closed) throttle plate, where the air speed increases to cause a low-pressure area in the idle passage/port, thus causing fuel to flow through the idle jet. The idle jet is set at some constant value by the carburetor manufacturer, thus flowing a specified amount of fuel.

  4. No, You Probably Don't Need to Warm Up Your Car Before ... - AOL

    www.aol.com/lifestyle/no-probably-dont-warm-car...

    Modern cars use sensors to adjust fuel consumption, and idling simply doesn't warm the engine enough for those sensors to respond. How Idling Beats Up a Modern Engine

  5. AMC computerized engine control - Wikipedia

    en.wikipedia.org/wiki/AMC_Computerized_Engine...

    The only analog sensor in the system was the oxygen sensor. In other respects, it was a typical "feedback" carburetor system of the early-1980s, using a stepper motor to control fuel mixture and a two-stage "Sole-Vac" (which used a solenoid for one stage, and a vacuum motor for the other) to control idle speed. [6]

  6. Engine control unit - Wikipedia

    en.wikipedia.org/wiki/Engine_control_unit

    In 1981, a Delco Electronics ECU was used by several Chevrolet and Buick engines to control their fuel system (a closed-loop carburetor) and ignition system. [10] By 1988, Delco Electronics was the leading producer of engine management systems, producing over 28,000 ECUs per day. [11]

  7. Throttle - Wikipedia

    en.wikipedia.org/wiki/Throttle

    Often a throttle position sensor (TPS) is connected to the shaft of the throttle plate to provide the ECU with information on whether the throttle is in the idle position, wide-open throttle (WOT) position, or somewhere in between these extremes. Throttle bodies may also contain valves and adjustments to control the minimum airflow during idle.

  8. Idle (engine) - Wikipedia

    en.wikipedia.org/wiki/Idle_(engine)

    Idle speed, sometimes simply called "idle", is the rotational speed an engine runs at when the engine is idling, that is when the engine is uncoupled from the drivetrain and the throttle pedal is not depressed. In combustion engines, idle speed is generally measured in revolutions per minute (rpm) of the crankshaft.

  9. Engine tuning - Wikipedia

    en.wikipedia.org/wiki/Engine_tuning

    Engine tuning is the adjustment or modification of the internal combustion engine or Engine Control Unit (ECU) to yield optimal performance and increase the engine's power output, economy, or durability. These goals may be mutually exclusive; an engine may be de-tuned with respect to output power in exchange for better economy or longer engine ...