35 Ill. Adm. Code 276.206
Engine and Fuel Type Modifications
Section 276
Section 276.206 Engine and
Fuel Type Modifications
In the inspection process,
vehicles that have been altered from their original certified configuration are
to be tested in the same manner as other subject vehicles. Specific procedures
to be used are as follows:
a) Vehicles with engines other than the engine originally
installed by the manufacturer or an identical replacement of such engine shall
be subject to the test procedures and standards for the chassis type and model
year of the vehicle.
b) Vehicles that have been switched from an engine of one fuel
type to another fuel type that is subject to the program shall be subject to
the test procedures and standards for the current fuel type, and to the
requirements of subsection (a) of this Section.
c) Vehicles that are switched to a fuel type for which there is
no certified configuration shall be tested according to the most stringent
emission standards established for that vehicle type and model year.