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Definition
| measure of oil's ability to pour |
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| two metal electrodes, separate from each other, immersed within an electrolyte containing both positive and negative ions |
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Definition
| sulfuric acid and water solution in battery |
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| measurement of cranking amperes that a battery can deliver over a period of 30 seconds at 0 F and still maintain a voltage of 1.2 V |
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Definition
| normal electrical load from the ECM, radio, and other electrical components placed on a vehicle's battery when the engine is not operating |
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| combustible substance that is burned in an engine to impart motion to the engine pistons |
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| HC; combination of hydrogen and carbon atoms; all petroleum-based fuels consist of these |
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| also called knocking or detonation; condition, accompanied by audible noise, occurring when gasoline in cylinders burns too quickly |
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Definition
| Assembly Line Diagnostic Link |
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Definition
| temperature of air surrounding an object |
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| resistor constructed of special type wire, properties of which tend to increase or decrease voltage in direct proportion to heat of wire |
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Definition
| the point in the temperature range at which a given fuel or lubricant will ignite and flash into flame |
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Definition
| a special wire inserted into a circuit to provide protection in event of overloading or short circuits; overloads will melt wire and break circuit; unlike a regular fuse, fusible link will permit overloading for a short time before melting |
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Definition
| sensor which allows the ECM to retard ignition timing when spark knock occurs |
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Term
| maintenance indicator light |
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Definition
| MIL; instrument panel light that illuminates to indicate a malfunction in the computer control system; used on both OBD I and OBD II systems |
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Term
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Definition
| "When pressure is exerted on confined liquid, it is transmitted undiminished." |
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Definition
| device in electronic distributor that senses engine speed from distributor rotation and sends electrical pulses to control unit |
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Term
| positive crankcase ventilation system |
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Definition
| PCV; system that prevents crankcase vapors from being discharged directly into atmosphere |
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Term
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Definition
| diode; electrical device that allows current to flow in one direction but blocks current flow in the other direction; used to change alternating current from the alternator int direct current; widely used in electronic components |
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Definition
| high-voltage wire from coil to distributor central tower and from outer towers to spark plug |
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Term
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Definition
| refers to some "hot" portion of the electrical circuit that has become grounded; wire touching a ground and providing a completed circuit to the battery |
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Definition
| an alternate or bypass portion of an electrical circuit |
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Definition
| ratio by weight between air and gasoline in the fuel mixture |
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Definition
| an emission control system used to lower levels of carbon monoxide and hydrocarbon emissions. Accomplished by injecting a stream of air into exhaust stream near exhaust valve |
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| wide open throttle switch |
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Definition
| sensor used for the kick-down function on automatic transmissions |
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Term
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Definition
| combustion chamber having a wedge shape |
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Term
| manifold absolute pressure sensor |
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Definition
| MAP; a sensing device that determines intake manifold pressure as a factor of engine speed and load changes. Sensor sends appropriate electrical signals to and ECM and ECM adjusts engine settings accordingly |
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Term
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Definition
| test used to indicate if low cylinder pressures are caused by worn piston rings only. The test is done exactly the same as the “dry” test, however a small amount of engine oil (about 1-2 teaspoons) is added into the cylinder to create temporarily seal (to prevent possible blow-by). If compression rises significantly afterwards, then worn piston rings are the culprit. |
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Definition
| the escape of exhaust gases past piston rings |
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Definition
| a magnetic or Hall effect switch that senda signal to the ECM as the camshaft rotates. The ECM uses this signal to determine camshaft position |
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Definition
| bhp; measurement of actual usable horsepower deliver at crankshaft; commonly computed on an engine on a chassis dynamometer |
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| device installed in the turbocharger to keep the turbocharger from developing too much pressure |
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Term
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Definition
| a component in some electronic ignition distributors, affixed to the distributor shaft and triggers magnetic pickup; the signal from the pickup triggers the electronic control device to break the coil primary circuit causing coil to fire |
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Definition
| cubic feet per minute; a measure of airflow |
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Definition
| emission control device containing activated charcoal granules; used to store gasoline vapors from system; when engine is started, stored vapors are drawn into engine and burned |
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Term
| crankshaft position sensor |
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Definition
| a magnetic or Hall effect switch that sends a signal to the ECM as the crankshaft rotates; the ECM uses this signal to determine crankshaft and piston position, as well as engine RPM |
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