![]() ![]() ![]() Two sets of values for HC and CO are obtained during the TSI test. The PPM and % standards vary, depending on vehicle model year and gross vehicle weight rating (GVWR). HCs are measure in parts per million (displayed on the VIR as PPM) and CO is measured in terms of percent (displayed on the VIR as %). The exhaust sample probe is inserted into the tailpipe far enough to obtain an accurate sample. TSI testing is done with the engine and exhaust system components (specifically the catalyst) fully warmed up and measures tailpipe hydrocarbon (HC) and carbon monoxide (CO) emissions in units of concentration, relative to the full exhaust stream. To avoid these malfunctions of the fuel tank, the pressure and vacuum relief valves open at preset pressure conditions and maintain near atmospheric pressure conditions inside the tank regardless of fuel level or temperature conditions. If the internal tank pressure gets too low (a vacuum created in the fuel tank) due to fuel cooling (caused by cool conditions), the fuel tank may collapse. If the internal tank pressure gets too high due to fuel expansion and vaporization (caused by high heat conditions), the fuel tank may expand beyond the limits of the tank seals and cause a rupture. Most caps incorporate positive and negative pressure relief valves that are designed to maintain an internal fuel storage tank pressure near atmospheric pressure. Fuel cap testing checks the cap to filler neck seal, and any pressure relief valves that are part of the cap. During a vehicle emissions test, the inspector is required to verify visible emissions do not exceed allowable limits.įuel tank filler cap testing is done to help ensure hydrocarbon (HC) vapors do not escape from the fuel storage tank to the atmosphere. The Vehicle Inspection Report (VIR) includes a Visual/Gas Cap results table that lists results of the visible smoke/emissions inspection, the gas cap pressure test and results of the tamper inspection.Īccording to the Utah Administrative Code, rule R307-201-3 for visible emissions standards No owner or operator of a gasoline powered engine or vehicle shall allow, cause or permit visible emissions and emissions from on-road diesel engines manufactured after January 1, 1973, shall be of a shade or density no darker than 20% opacity, except for starting motion no farther than 100 yards. This visual inspection for tampering helps to identify vehicles which may be emitting excessive pollutants, but are not being properly evaluated because of an improper vehicle modification. ![]() The emissions inspector conducts a visual inspection of the emissions related systems and related components for unauthorized or illegal modifications. The different vehicle emissions inspections that are used in the AirCheck Davis Program include: Be prepared to provide the following information: To determine the exact type of emissions test that applies to a specific vehicle, contact Worldwide Environmental Products (WEP) at (801) 546-8860. The AirCheck Davis County program mitigates the prevalence of these emissions as well as secondary pollutants such as ozone (O3) and very small inhalable particulates, and their impact on human health and our environment.ĭepending on the vehicle model year, weight rating, and fuel type, the emissions analyzer selects the appropriate test combination for the vehicle undergoing emissions testing. The inspections administered via the program identify gross polluting vehicles that emit excessive levels of harmful emissions. For 2012, the AirCheck Davis County Program inspects all 1968 and newer light-, medium-, and heavy-duty vehicles licensed to operate on public roads. ![]()
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