Idling speed and carbon monoxide (CO) emission play an important role in protecting the environment and ensuring safe vehicle operation. An idling speed test and a carbon monoxide check are performed to ensure vehicles are running correctly and efficiently.
Idling Speed
Idling speed is the engine speed when the vehicle is not moving and the clutch is disengaged. An optimal idle speed setting is determined by the vehicle make and model. When idling speed drops below the optimal setting, the fuel economy will drop and the engine could stall. Additionally, a low idle speed could cause increased emissions of carbon monoxide, hydrocarbons and nitrogen oxide; all of which can contribute to air pollution.
To ensure the optimal idle speed is set correctly, a technician will connect a scan tool to access the engine’s computer. The technician will adjust the idle speed as needed. He will adjust the throttle position sensor and the idle air control solenoid. If the idle speed is still not stable after adjustments are made, the mechanic may need to replace components such as the throttle body, vapor canister purge valve and fuel injectors.
Carbon Monoxide Check
Carbon monoxide (CO) is a colorless, odorless and highly toxic gas. It is a byproduct of combustion and can have adverse effects on the respiratory system. Vehicle exhaust is the primary source of CO emissions and it is essential to check the levels to ensure they are within regulation.
To check the a vehicle’s carbon monoxide emissions, the technician will connect a car exhaust analyzer to the vehicle’s exhaust system. The analyzer will measure the amount of carbon monoxide present in the exhaust. If the levels are too high, the technician can make adjustments to reduce the emissions. The most common adjustment is to increase the air-fuel mixture. Additionally, the technician can check for clogged fuel injectors, faulty oxygen sensors and a dirty air filter as these could all contribute to excessive CO emission.
Conclusion
Performing an idle speed test and a carbon monoxide check is essential to ensure vehicles are running correctly and efficiently. These tests must be done regularly to ensure vehicles are emitting a safe amount of pollutants. Adjustments must be make if the idle speed is not within the optimal range or if there is an excessive amount of carbon monoxide present in the exhaust. Although these tests are time consuming, they are essential to protecting the environment and ensuring reliable vehicle operation.
