API PUBL 4637-1996

$22.75

Analysis of Causes of Failure in High Emitting Cars

Published By	Publication Date	Number of Pages
API	1996	102

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Description

Under contract to the American Petroleum Institute (API), Sierra Research, Inc. (Sierra) conducted a study of on-road motor vehicle emissions data to determine the primarycauses of excessive exhaust emissions in the in-use motor vehicle fleet.* That topic is important from the perspective of how to craft motor vehicle control programs toeffectively reduce in-use emissions. The analyses performed in this effort attempted to quantify the emissions impacts of individual emission control system componentdefects, the prevalence of those defects in the in-use motor vehicle fleet, and the overall contribution of those defects to fleet-average emissions. In addition, the primarycauses of defective emission control system components were categorized according to whether the defect was the result of a mechanical component failure, electricalcomponent failure, poor maintenance, or tampering. Estimates of the magnitude of each of these failure modes on excessive emissions were then made.

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