ASE Engine Repair
Terms & Definitions
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AC
The proportion of air to fuel by weight in the mixture drawn into the engine.
Alternating current
Diagonal line of direction. In reference to tires, bias means that belts and plies are delayed diagonally or crisscross each other.
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.