idle screw
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fast idle screw — A screw on a carburetor for adjusting the speed of the fast idle … Dictionary of automotive terms
screw — [1] A spiral path along a cylinder. [2] A fastening device. A screw is like an inclined plane wrapped up. It can take a rotating force and change it into a much larger straight line force. See adjusting screw aiming screw air bleed screw air… … Dictionary of automotive terms
idle — The engine speed when the vehicle is not moving. The engine s slowest practical speed. Also see fast idle fast idle cam fast idle screw fast idle solenoid tick over … Dictionary of automotive terms
idle air bleed screw — A screw found on some carburetors which allows air to enter the carburetor when the throttle is closed, so that the vehicle can idle. It also prevents the formation of deposits in the throttle area. The adjustment of this screw is part of a basic … Dictionary of automotive terms
idle channel restriction — Used on carbureted vehicle. Does the same thing as the idle feed restriction, but is located in the idle passage just below the idle air bleed instead of the bottom of the idle tube. In the primary idle channel, the amount of fuel emitted by the… … Dictionary of automotive terms
idle system — At idle speed, the throttle valve is closed to such an extent that the airflow underneath the plunger no longer forms a sufficient vacuum; the fuel is then supplied via an auxiliary system, the idle system, which consists of the idle jet, the… … Dictionary of automotive terms
idle mixture adjustment screw — See idle mixture screw … Dictionary of automotive terms
idle speed screw — A screw located at the bottom of the carburetor on the outside which keeps the throttle from closing completely when the vehicle is idling and thus controls the idle speed. This is adjusted as part of a basic tune up … Dictionary of automotive terms
idle mixture screw — A tapered screw located on the outside of the carburetor which controls the proportion of the fuel air mixture. It is now illegal to adjust these if limiter caps are present. If you turn the screw clockwise, the mixture will be leaner while… … Dictionary of automotive terms
idle limiter cap — An external plastic cap on the head of the idle mixture adjustment screw to maintain preset emissions levels and prevent unauthorized tampering … Dictionary of automotive terms
