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.

  • Corporate Authors:

    Olson Laboratories, Incorporated

    421 East Cerritos Avenue
    Anaheim, CA  United States  92805

    California Air Resources Board

    1001 I Street, P.O. Box 2815
    Sacramento, CA  United States  95812
  • Authors:
    • Gunderson, J
  • Publication Date: 1976-3

Media Info

  • Pagination: 288 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00136486
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Final Rpt., ARB-3-199/3-584-76-41
  • Contract Numbers: ARB-3-199,, ARB-3-584
  • Files: TRIS
  • Created Date: Jul 13 2003 12:00AM