OAR 340-256-0420: Emission Control System Inspection: Heavy-Duty Gasoline Motor Vehicle Emission Control Standards

This rule documents the standards not to be exceeded for heavy duty gasoline vehicle emission tests. (1) CO idle emission values: (a) 1975–1978 Model Year: 4.0%; (b) 1979 and Newer Model Year without catalyst: 3.0%; (c) 1985 and Newer Model Year with catalyst: 1.0%. (2) Gross CO emissions exceed the applicable model year CO standard by a factor of one and one-half (1.5). (3) Hydrocarbon idle emission values: (a) 1975–1978 Model Year: 500 PPM; (b) 1979 and Newer Model Year without catalyst: 350 PPM; (c) 1985 and Newer Model Year with catalyst: 220 PPM. (4) Gross HC emissions exceed the applicable model year HC standard by a factor of three (3). (5) Visible emission must not occur during the steady-state unloaded engine idle and raised rpm portion of the emission test from either the vehicle’s exhaust system or the engine crankcase. (6) The Director may grant a waiver from standards listed in sections (1)–(4) for vehicle classes that DEQ determines present prohibitive inspection problems meeting the listed standards in sections (1) – (4) if DEQ deems the motor vehicle pollution system otherwise meets the standards of this Division. [NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-200-0040.]