OAR 340-256-0400: Emission Control System Inspection: Light Duty Motor Vehicle Emission Control Standards for Basic Program

This rule documents the standards not to be exceeded for light duty motor vehicles that undergo the Basic emission test. (1) Light Duty Diesel Motor Vehicle Emission Control Standards: 1.5% CO; there is no HC standard. (2) Light Duty Gasoline Motor Vehicle Emission Control Standards: Four-Stroke Cycle — Passenger Cars: (a) 1975–1980 Model Year: (A) With Catalyst: 1.0% CO and 220 ppm HC; (B) Without Catalyst: 2.5% CO and 300 ppm HC. (b) 1981 and Newer Model Year: at idle — 1.0% CO and 220 ppm HC; (3) Light Duty Gasoline Motor Vehicle Emission Control Standards — Light Duty Trucks: (a) 6,000 GVWR or less: (A) 1975–1980 Model Year: (i) With Catalyst: 1.0% CO and 220 ppm HC; (ii) Without Catalyst: 2.5% CO and 300 ppm HC. (B) 1981 and Newer Model Year: at idle — 1.0% CO and 220 ppm HC; (b) 6,001 to 8,500 GVWR: (A) 1975–1978 Model Year: 2.5% CO and 300 ppm HC; (B) 1979–1980 Model Year: (i) With Catalyst: 1.0% CO and 220 ppm HC; (ii) Without Catalyst: 2.5% CO and 300 ppm HC. (C) 1981 and Newer: at idle — 1.0% CO and 220 ppm HC; (4) Gross CO emissions exceed the applicable model year CO standard by a factor of one and one-half (1.5). (5) Gross HC emissions exceed the applicable model year HC standard by a factor of three (3). (6) Visible emissions must not occur during the steady-state unloaded and raised rpm engine idle portions of a gasoline engine emission test from either the vehicle’s exhaust system or the engine crankcase. For a diesel engine emissions test, visible emissions must not exceed 20% opacity. (7) The Director or Director’s delegate may grant a waiver from standards listed in sections (1)–(6) for vehicle classes that DEQ determines present prohibitive inspection problems meeting the standards in sections (1) – (6) 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.]