Saturday, December 21, 2013
Oldsmobile Cutlass Vehicle Emission Control Information
The emission controls on an Oldsmobile Cutlass are fully integrated with ignition and fuel system controls. All of these control systems work together to ensure the engine works efficiently with minimal production of harmful exhaust gases.
Crankcase Ventilation System
The crankcase ventilation system controls unburned fuel vapor that leaks from the pistons into the crankcase. Normally these vapors would leak into the atmosphere since they are under pressure. If left alone they contaminate the engine oil and allow sludge to build up in the crankcase. The crankcase ventilation system recycles these gases back into the air intake so they can be re-burned in the pistons. The Positive Crankcase Valve (PCV) controls how much of the gas is recycled at any given time.
Evaporative Emission Control System
The Evaporative Emission Control System (EEC) is a carbon canister that reduces emissions of fuel vapors from the fuel system. It stores fuel vapors and vents them through a filter containing activated charcoal. The charcoal absorbs vapors while the engine is not running. The charcoal releases the vapors into the air intake manifold when the engine is running. A solenoid closes the canister to air when the engine is turned off so that fuel vapor is not lost to the atmosphere.
Exhaust Gas Recirculation System
The Exhaust Gas Recirculation System, or EGR, reduces oxides of nitrogen emissions. Nitrogen oxides are often written as "NOx" and they are harmful to human and animal health. The EGR is a valve which, under certain conditions, allows some exhaust gas to recirculate into the intake manifold. The exhaust gas then cools combustion temperature and controls detonation of the fuel/air mixture. The EGR valve is mounted on the intake manifold and uses manifold vacuum to open up and vent some exhaust gas into the intake manifold. It is activated only when the engine reaches normal operating temperature. Too much exhaust flow into the intake manifold can cause stalling after a cold start or during deceleration.
Thermostatic Air Cleaner
The Thermostatic Air Cleaner (THERMAC) warms air entering the carburetor when the engine is cool and maintains a controlled air temperature into the carburetor. This reduces the amount of time the choke needs to be on and results in better fuel economy and lower harmful emissions.
Air Management System
The Air Management System injects oxygen into the exhaust ports, exhaust manifolds and catalytic converter to burn off any fuel vapor left in the exhaust gas. The system shuts off only during deceleration or rapid acceleration to prevent backfiring. The system reduces the levels of hydrocarbon and carbon-oxygen combinations in exhaust gases.
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