Section 85.524 - [Removed effective 6/17/2024] Legacy standardsPrior to April 8, 2011, the following emission standards applied for conversions of vehicles/engines with an original model year of 1992 or earlier:
(a)Exhaust hydrocarbons. Light-duty vehicles must meet the Tier 0 hydrocarbon standard specified in 40 CFR 86.094-8 . Light-duty trucks must meet the Tier 0 hydrocarbon standard specified in 40 CFR 86.094-9 . Otto-cycle heavy-duty engines must meet the hydrocarbon standard specified in 40 CFR 86.096-10 . Diesel heavy-duty engines must meet the hydrocarbon standard in 40 CFR 86.096-11 .(b) CO, NOX and particulate matter. Vehicles/engines must meet the CO, NOX, and particulate matter emission standards that applied for the vehicle's/engine's original model year. If the engine was certified with a Family Emission Limit, as noted on the emission control information label, the modified engine may not exceed this Family Emission Limit.(c)Evaporative hydrocarbons. Vehicles/engines must meet the evaporative hydrocarbon emission standards that applied for the vehicle's/engine's original model year.