Injector

A ECU controlled solenoid,  Used to atomize fuel at a specific ratio into an engine’s cylinder  for combustion.

ECU

A computer that determines  air/ fuel ratios by using a multitude of sensor that relay existing conditions both on the outside side and inside of a vehicle. Then places this data into a pre programed 3D fuel map.   Modern ECU’s also handle other functions of a vehicle such as traction control and ABS; though they may be a separated unit from the fuel control or Engine management ECU’s

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Shim

A type of Plain bearing, applied for axial loads only; Having a precision thickness.  Most commonly used in the valve train of an engine to have adjustments in the clearance between a valve and cam.

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Dispersant

A Petroleum additive that keeps small particles from combining with oil and creating sludge