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Helps prevent the formation of oxides of nitrogen by recirculating a certain amount of exhaust as in inert gas through the intake manifold to keep deep peak combustion temperatures below what would form those chemical compounds. The computer determines when and how much exhaust to recirculate based on information from all its other sensors. It then actuates the EGR solenoid, which opens a vacuum circuit or operates and electronic circuit to actually work the EGR valve. The computer uses a dual cycle signal to activate the solenoid.
And ignition system that does not use a distributor, but instead has coils dedicated to individual spark plugs are pairs of spark plugs. Referred to as distributor list ignition and direct ignition, coil near plug ignition or coil over plug ignition. A system in which the timing and firing of the spark plugs is controlled by an electronic control unit.
The bearing areas of a crankshaft are the main rod journals.