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Stub Frame

A term used for sub frame.

Stud

A round, bolt-like metal fastener with threads on both ends.

Stud-mounted Rocker Arms

Individually mounted rocker arms with the use of a stud and ball.

Studded Tires

Tire that provides improved traction on ice, but are prohibited by law in many states because their use resulted in road-surface damage.

Stuffer

A supercharger.

Stumble

1. The tendency of an engine to falter and catch resulting in a hesitation. 2. A momentary abrupt deceleration during acceleration.

STV

Suction throttle valve.

STVS

Secondary throttle valve system.

Sub-EGR Control Valve

A vacuum valve used on Chrysler/Mitsubishi 2.6 liter engines that is operated mechanically by means of the throttle linkage, so it varies the signal to the exhaust-gas recirculation valve according to the position of the accelerator pedal.

Subassembly

A self-contained group of parts of electrical components that are a part of the whole overall assembly.

Subcooler

A section of liquid line used to ensure that only liquid refrigerant is delivered to the metering device; may be a part of the condenser or may be placed in the drip pan of the evaporator.

Subcooling

The cooling of a liquid below its condensing temperature.

Subframe

A partial front or rear chassis frame often used in unibody design to support engine or suspension assemblies.

Submerged Arc Welding(Saw)

A process where a weld is made by feeding a bare wire into a blanket of granular fusible flux.

Substrate

1.The supporting structure in a catalytic converter where the catalyst is applied. 2. The physical support material or foundation upon which an integrated circuit is fabricated.

Subsystem

One of several complete, smaller system working together to make up a larger system.

Suburban

A large truck-based station wagon marketed by Chevrolet and GMC.

Suction

A negative pressure.

Suction Accumulator

A term used for accumulator.

Suction Accumulator/drier