OAR 340-256-0390
Emission Control System Inspection: Heavy Duty Gasoline Motor Vehicle Emission Control Test Criteria
(1)
A vehicle emission control test is not valid if the vehicle exhaust system leaks in such a manner as to dilute the exhaust emissions being sampled by the gas analytical system. For the purpose of emission control tests conducted at state facilities, tests will not be considered valid if the exhaust emissions are diluted to such an extent that the sum of the CO and CO2 concentrations recorded for the idle speed reading from an exhaust outlet is six percent or less.(2)
A vehicle emission control test is not valid if the engine idle speed exceeds 1300 RPM.(3)
Intentionally left blank —Ed.(a)
A vehicle emission control test is not valid if the gas cap or catalyst has been disconnected, plugged, or otherwise made inoperative in violation of ORS 815.305 (Disconnection or alteration of pollution control equipment)(1), except as noted in 815.305 (Disconnection or alteration of pollution control equipment)(2).(b)
DEQ may provide alternative criteria for those required under subsection (a) of this section if it determines that the component or an acceptable alternative is unavailable.(c)
The use of a non-original equipment aftermarket part (including a rebuilt part) as a replacement part is not a violation of ORS 815.305 (Disconnection or alteration of pollution control equipment), if DEQ determines that such use will not adversely affect emission control efficiency.(d)
Adjustments or alterations of a particular part or system parameter, if done for purposes of maintenance or repair according to the vehicle or engine manufacturer’s instructions, are not violations of ORS 815.305 (Disconnection or alteration of pollution control equipment).(4)
A 1981 or newer model motor vehicle that has been converted to operate on gaseous fuels is in violation of ORS 815.305 (Disconnection or alteration of pollution control equipment) if elements of the factory-installed motor vehicle air pollution control system are disconnected for the purpose of conversion to gaseous fuel as authorized by 815.305 (Disconnection or alteration of pollution control equipment).
Source:
Rule 340-256-0390 — Emission Control System Inspection: Heavy Duty Gasoline Motor Vehicle Emission Control Test Criteria, https://secure.sos.state.or.us/oard/view.action?ruleNumber=340-256-0390.