A study was conducted to determine the effects of vehicle maintenance practices on exhaust emissions. Four groups of 144 1968 to 1974 light duty vehicles, representative of California's population in 1975 were evaluated. The groups represented (1) a control group, (2) a 50% pass-fail idle test inspection, (3) manufacturers specification and (4) mandatory maintenance and parameter inspection. All vehicles entering the test program received a baseline 1973 Federal CVS emission test, followed by a hot-idle test (low and 2,500 rpm). Adjustment or repair of vehicles was accomplished by Olson Laboratories for Group II and Group III vehicles. Class A garages performed maintenance on Group IV vehicles. Following the necessary maintenance, the Federal and idle tests were repeated for Group II, Group III, and Group IV vehicles. All vehicles in these groups were retested at 1- 2- 6- 9- and 12-month intervals. This report documents the results of the test program.
Degradation Effects on Motor Vehicle Exhaust Emission
1976
228 pages
Report
Keine Angabe
Englisch
Air Pollution & Control , Exhaust emissions , Air pollution control , Degradation , Automobiles , Graphic methods , California , Performance evaluation , Maintenance , Carbon monoxide , Hydrocarbons , Nitrogen oxides , Particles , Automobile engines , Air pollution control equipment , Automobile exhaust , Light duty vehicles , Motor vehicle inspection
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