Quote:
Originally Posted by xoxoxoBruce
The engine management system gets input from several sources, ... Not all input is used to calculate all directions, only what's pertinent.
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Pertinent to both engine speed and spark plug firing is one sensor. Typically a crankshaft position sensor or a camshaft position sensor. Computer uses that sensor to measure engine speed and determines when to fire spark plugs. How does a manifold vacuum sensor, throttle position sensor, air temperature sensor, Oxygen sensor, EGR position sensor, fuel pressure sensor, coolant temperature sensor, load sensor, or battery voltage measure engine speed?