(a) Use the equipment and procedures for spark-ignition engines in 40 CFR part 1065 to show your engines meet the duty-cycle emission standards in §1048.101(a) and (b). Measure HC, NOX, CO, and CO2 emissions using the full-flow dilute sampling procedures in 40 CFR part 1065. Use the applicable duty cycles in §§1048.505 and 1048.510.

(b) We describe in §1048.515 the supplemental procedures for showing that your engines meet the field-testing emission standards in §1048.101(c).

(c) Use the fuels specified in 40 CFR part 1065, subpart C, for all the testing we require in this part, except as noted in §1048.515. Use these test fuels or any commercially available fuel for service accumulation.

(d) To test engines for evaporative emissions, use the equipment and procedures specified for testing diurnal emissions in 40 CFR 86.107-96 and 86.133-96 with fuel meeting the specifications in 40 CFR part 1065, subpart C. Measure emissions from a test engine with a complete fuel system. Reported emission levels must be based on the highest emissions from three successive 24-hour periods of cycling temperatures. Note that you may not be required to test for evaporative emissions during certification if you certify by design, as specified in §1048.245.

(e) You may use special or alternate procedures, as described in 40 CFR 1065.10.

(f) We may reject data you generate using alternate procedures if later testing with the procedures in 40 CFR part 1065 shows contradictory emission data.