RobStark
Well-Known Member
:
"Anyone wishing to sell an engine or vehicle within the United States must demonstrate compliance with the CAA and all applicable EPA regulations. This approval process differs from the self-certification used by NHTSA and is closer to the EU type approval system for safety and emissions regulations. Once EPA sets emission standards for a particular engine and/or vehicle category, manufacturers must produce engines that meet those standards by a specified date.75 Conformity is determined under test procedures specified by EPA.76 The most common testing procedure used by EPA is the Federal Test Procedure, as mandated by the Energy Tax Act of 1978.77 Tests are based on the Urban Dynamometer Driving Schedule 78 to reflect typical driving patterns (e.g., city, highway, aggressive, and use of air conditioning). Currently, EPA uses a three-tiered compliance strategy for light-duty vehicles: (1) pre-production evaluation to certify vehicles prior to sale; (2) a production evaluation on the assembly line for early evaluation of production vehicles, and (3) a final clearance applied to verify that properly maintained vehicles continue to meet the standards after several years of use."
More than anyone needs to know at: https://www.hsdl.org/?view&did=751039
OOps, forgot the word "not" before I hit "reply"