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An investigation of the clean-up effects of a Combustion Chamber Deposit (CCD) detergent additive package on tailpipe exhaust emissions was conducted using (6) 1992 2.3L vehicles. Part one of this program was a deposit build-up phase for all cars and part two included two phases where, in the first phase, one-half of the cars were operated with the CCD detergent package and the other half were run as a control on the build-up fuel. In the final phase, the fuels were switched between the sets of vehicles to compensate for any vehicle to vehicle differences. A gasoline containing a detergent package which provided port fuel injector (PFI) and intake valve deposit (IVD) cleanliness performance in accordance with California Air Resources Board (CARB) requirements was used as the deposit build-up fuel for part one and as the control in part two. This fuel is typical of many gasolines that are in the market place today.