RESULTS OF INSPECTION/MAINTENANCE CATALYST TESTS ON A 1975 DODGE DART

The purpose of the test program was to determine whether or not a car with an inactive catalyst could be made to pass I/M short tests through maladjustment of the engine idle mixture, idle speed, and initial timing. Exhaust emissions and temperatures were both measured for each maladjustment. The Federal Three Mode and Two Speed Idle Test were run for each vehicle test condition. In addition, the potential of catalyst diagnostic tests was investigated. For these tests the effect of disconnecting the air pump or a spark plug on exhaust emissions and temperatures was determined. These tests were performed in conjunction with the above emission and temperature mapping. This report presents the measured data of a short program designed to determine the ability of existing I/M scenarios to detect an inactive catalyst.

  • Corporate Authors:

    Environmental Protection Agency

    Technology Assessment and Evaluation Branch
    Ann Arbor, MI  United States  48105
  • Authors:
    • BARTH, E A
  • Publication Date: 1979-12

Media Info

  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00313493
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EPA-AA-TAEB-80-3 Tech Rpt.
  • Files: TRIS
  • Created Date: Jun 26 1980 12:00AM