(a) This subpart contains procedures for performing idle exhaust emission tests on Otto-cycle heavy-duty engines and Otto-cycle light-duty trucks. Equipment required and specifications are as follows:

(1) Exhaust emission tests. All engines and vehicles subject to this subpart are tested for exhaust emissions. Necessary equipment and specifications appear in §§86.1509 through 86.1511.

(2) Fuel and analytical tests. Fuel requirements for idle exhaust emission testing are specified in §86.1513. Analytical gases are specified in §86.1514.

(b) Through the 2009 model year, manufacturers may elect to use the appropriate test procedures in this part 86 instead of the procedures referenced in 40 CFR part 1065 without getting advance approval by the Administrator.

[59 FR 48536, Sept. 21, 1994. Redesignated and amended at 73 FR 37194, June 30, 2008]