Some 1995 and older all-wheel-drive and some vehicles specially equipped for the handicapped cannot be tested using a dynamometer test. These vehicles will be tested using the Pre-Conditioned Two-Speed Idle (PC TSI) tailpipe test. Vehicles with a GVWR between 8,501 LBS to 10,000 LBS, regardless model year, will also be subject to the PC TSI test. This applies for all fuel types except diesel. All diesel vehicles with a GVWR between 8,501 LBS to 10,000 LBS are subject to a tailpipe test utilizing an opacity testing device.