![]() A second, more common source of knock/ping is operating the engine in too low of an RPM range for the "work" requirement of the moment. If the ECU detects knock, a condition which is potentially destructive to engines, and "judges" it to be the result of the ignition timing being too early in the compression stroke, it will delay (retard) the timing of the spark to prevent this. ![]() An ECU can adjust the exact timing of the spark (called ignition timing) to provide better power and economy. Mixture control on computer controlled carburetors works similarly but with a mixture control solenoid or stepper motor incorporated in the float bowl of the carburetor.Ī spark ignition engine requires a spark to initiate combustion in the combustion chamber. If the engine has not warmed up yet, more fuel will be injected (causing the engine to run slightly 'rich' until the engine warms up). The ECU will inject more fuel according to how much air is passing into the engine. If the throttle pedal is pressed further down, this will open the throttle body and allow more air to be pulled into the engine. ![]() For an engine with fuel injection, an engine control unit (ECU) will determine the quantity of fuel to inject based on a number of parameters.
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