N.M. Code R. § 20.11.101.14 Inspection Criteria For Air Care Inspeciton Facilities

• Library: New Mexico Administrative Code
• Edition: 2023
• Currency: Current through Register Vol. 34, No. 24, December 19, 2023
• Citation: N.M. Code R. § 20.11.101.14
• Year: 2023

Failure to pass any one of the applicable criteria specified below as, Exhaust Emissions; Anti-Tampering; or Visible Emissions (smoke), referred to respectively as Subsections A, B, C, of 20.11.101.14 NMAC, shall constitute noncompliance with 20.11.101 NMAC, and a fail VIR shall be issued.

A. Exhaust Emissions: Inspection procedure for all vehicles other than diesel-powered vehicles shall be consistent with the requirements specified in 40 CFR Part 51 Subpart S Appendix B.

(1) A non-diesel motor vehicle manufactured on or before the 1980 model year shall be required to take and pass only the idle mode test condition. A non-diesel motor vehicle manufactured in or after the 1981 model year shall be required to take and pass both the loaded test condition (except as specified in Paragraph (2), of Subsection A of 20.11.101.14 NMAC for full time four wheel drive) and the idle mode test condition.(a) Loaded mode condition: Vehicles tested under the loaded mode shall have the drive wheels placed on a dynamometer and the vehicle shall be operated as prescribed in Table I, in drive for automatic transmissions and 2nd or higher gear for manual transmissions. Exhaust reading for HC and CO shall be recorded after readings have stabilized or at the end of 30 seconds, whichever comes first. After exhaust emissions have been recorded, engine speed shall be returned to idle for the idle mode test. (b) Idle mode test condition: The idle mode test shall be performed with (i) the vehicle in drive for pre 1981 model year vehicles with automatic transmissions, or (ii) in neutral both for, vehicles with manual transmissions and for post 1980 model year vehicles with automatic transmissions. Exhaust emissions shall be recorded for HC and CO concentrations after readings have stabilized or at the end of 30 seconds, whichever occurs first. A CO2 reading less than 6% will be deemed as proof of exhaust sample dilution, and the vehicle shall be rejected from further emissions inspections until the vehicle is repaired. The vehicle owner will be provided with an INVALID VIR.

(2) 1981 and newer constant four wheel drive vehicles shall be inspected and required to pass an unloaded 2500 rpm + 300 rpm test ("set RPM") and an idle mode test. The appropriate maximum allowables listed in Table II shall apply to both test conditions. Vehicle transmissions shall be placed in neutral. During the unloaded 2500-rpm test exhaust emissions for HC and CO shall be recorded after the engine reaches set rpm and readings have stabilized. A sampling algorithm shall allow for sampling system delay. If the recorded readings are below the appropriate maximum allowable (PASS), the unloaded 2500-rpm test shall terminate and the engine speed shall be returned to idle for an idle mode test If the recorded readings at 2500 rpm are above the appropriate maximum allowables (FAIL), real time sampling shall continue until the vehicle either passes or ninety (90) seconds have elapsed, whichever occurs first. After final exhaust emissions reading have been recorded, engine speed shall be returned to idle for an idle mode test. The idle mode test shall be performed as described in Subparagraph (b), of Paragraph (1), of Subsection A of 20.11.101.14 NMAC.

(3) Conditioning mode: If a non-diesel vehicle manufactured in or before the 1980 model year fails the idle mode test, and if requested by the vehicle operator, the vehicle shall be conditioned according to one of the following conditioning modes and retested at idle: (a) Fast idle condition: For constant four wheel driven vehicles, the engine shall be conditioned by increasing the engine speed to 2500 RPM (+/-300) for a period of 30 seconds with the transmission...