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Effect of Engine Condition on FTP Emissions and In-Use Repairability
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English
Abstract
Twenty in-use vehicles that had failed the I/M test in the State of Michigan were inspected for engine mechanical condition as well as the state of the emission control system. Mass emission tests were conducted before and after repairs to the emission control system. The internal engine condition (i.e., high or low levels of cylinder leakage, or compression difference) showed little effect on the ability of the repaired vehicles to achieve moderate mass emission levels. Nine of the twenty vehicles were recruited after three years, and with the exception of tampering, the original emission control system repairs proved to be durable.
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Brown, N., Glover, E., and Clemmens, W., "Effect of Engine Condition on FTP Emissions and In-Use Repairability," SAE Technical Paper 920822, 1992, https://doi.org/10.4271/920822.Also In
References
- EPA-AA-TSS-I/M-90-X, Draft Report on the EPA/Manufacturer Cooperative I/M Testing Program, v 1.6, November 1990.
- EPA-AA-TSS-I/M-90-3, Recommended I/M Short Test Procedures For the 1990's: Six Alternatives, EPA Technical Report, March 1990.