Inspection/Maintenance in the 1990's

Paper #:
  • 870621

Published:
  • 1987-08-01
Citation:
Armstrong, J., Brzezinski, D., Landman, L., and Glover, E., "Inspection/Maintenance in the 1990's," SAE Technical Paper 870621, 1987, https://doi.org/10.4271/870621.
Pages:
24
Abstract:
In the 1990's there will be a different mix of vehicle technologies than existed in the late 1970's when inspection/Maintenance (I/M) programs were first mandated. These changes include the widespread use of “closed-loop” computer control of engine parameters and fuel injection. Several studies by EPA are examined to determine the effect of these changes on existing I/M programs and to investigate new methods of vehicle inspection. The report discusses the effectiveness of a standard idle emission test versus other inspection methods, the role of proper preconditioning, self-diagnostic trouble code checks as a method to identify high emitting vehicles, uncertainties in predicting tampering and misfueling rates for the future, problems with decentralized programs, and the effectiveness of I/M repairs in reducing vehicle emissions as measured on the Federal Test Procedure.
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