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Effect of Engine Condition on FTP Emissions and In-Use Repairability

Technical Paper
920822
ISSN: 0148-7191, e-ISSN: 2688-3627
DOI: https://doi.org/10.4271/920822
Published February 1, 1992 by SAE International in United States
Annotation ability available
 
Sector:
Automotive  
Language: 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.