§ 86.1912 How do I determine whether an engine meets the vehicle-pass criteria?
In general, the average emissions for each regulated pollutant must remain at or below the NTE threshold in paragraph (a) of this section for at least 90 percent of the valid NTE sampling events, as defined in paragraph (b) of this section. For 2007 through 2009 model year engines, the average emissions from every NTE sampling event must also remain below the NTE thresholds in paragraph (g)(2) of this section. Perform the following steps to determine whether an engine meets the vehicle-pass criteria:
(a) Determine the NTE threshold for each pollutant subject to an NTE standard by adding all three of the following terms and rounding the result to the same number of decimal places as the applicable NTE standard:
(1) The applicable NTE standard.
(2) The in-use compliance testing margin specified in § 86.007-11(h), if any.
(3) An accuracy margin for portable in-use equipment when testing is performed under the special provisions of § 86.1930, depending on the pollutant, as follows:
(i) NMHC: 0.17 g/hp·hr.
(ii) CO: 0.60 g/hp·hr.
(iii) NOX: 0.50 g/hp·hr.
(iv) PM: 0.10 g/hp·hr.
(v) NOX + NMHC: 0.67 g/hp·hr.
(4) Accuracy margins for portable in-use equipment when testing is not performed under the special provisions of § 86.1930 for 2007 through 2009 model year engine families that are selected for testing in any calendar year as follows:
(i) NMHC using the emission calculation method specified in 40 CFR 1065.650(a)(1): 0.02 g/hp·hr.