Automobile Engineering in ME
The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Warm up and lubricate the pump
Enable the pump's fault diagnosis function to operate
Pressurise the fuel system before the engine is started
Supplies a large amount of fuel and thereby creates a choke effect

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Approaching the T.D.C. position on its compression stroke
Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke
Exactly at the T.D.C. position on its compression stroke

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Balance the timing in the movement of the two groups of pistons
Adjusts the timing of the intake and exhaust valve openings
Increase inertia force of the rotating crankshaft
Reduce vibrations caused by the crankshaft rotation

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