If you need an emissions test for an older vehicle that isn't compatible with OBD-II testing, visit Gines Auto Service for a two-speed idle inspection.
A two-speed idle inspection is a type of emissions test that measures exhaust emissions at two different engine speeds: idle and a specified higher RPM (usually around 2,500 RPM). This method is typically used on older vehicles that are not equipped with On-Board Diagnostics II (OBD-II) systems, which became standard in 1996 for passenger vehicles in the United States.
During a two-speed idle inspection, the vehicle is parked and the engine is run at both idle speed and the higher RPM. An emissions analyzer is used to measure the concentration of pollutants such as hydrocarbons (HC), carbon monoxide (CO), and sometimes oxides of nitrogen (NOx) in the exhaust. These pollutants are byproducts of the combustion process and can contribute to air pollution and smog.
The test is designed to simulate the conditions under which a vehicle is commonly operated — at rest and at a steady engine speed. If the emissions are above the allowable limits set by the regulatory authority, the vehicle may fail the inspection and may require repairs to its emissions control systems before it can pass.
Two-speed idle inspections are one of several methods used to ensure that vehicles meet emissions standards.
Gines Auto Service serves Kearns, UT and surrounding areas.
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