Engine analyzer is an instrument used to determine the performance of parts of gasoline and diesel engines. An engine analyzer attaches directly to the engine. Mechanics and car owners use such analyzers to help determine problems so that they can adjust or replace engine parts.
Engine analyzers range in design from simple models, which monitor a few engine functions, to complex, computerized models. An engine analyzer may consist of a number of devices, such as an oscilloscope and a tachometer. An oscilloscope evaluates the ignition system. A tachometer assists in adjusting idle speed.
Most automobiles produced today include an internal computer that controls and monitors the engine. If the internal computer finds a problem, it broadcasts a diagnostic trouble code (DTC) corresponding to that particular problem. A computerized engine analyzer, often called a scan tool, scans for these codes.
See also Diesel engine; Gasoline engine.
