Oregon Administrative Rules
Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY
Division 256 - MOTOR VEHICLES
Section 340-256-0420 - Emission Control System Inspection: Heavy-Duty Gasoline Motor Vehicle Emission Control Standards

Universal Citation: OR Admin Rules 340-256-0420

Current through Register Vol. 64, No. 3, March 1, 2025

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.]

Statutory/Other Authority: ORS 468A.360

Statutes/Other Implemented: ORS 468A.360

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