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OLS Field Name OLS Field Data
Main Title Variability of I/M Test Scores over Time.
Author Smith., L. R. ;
CORP Author Southwest Research Inst., San Antonio, TX.;Environmental Protection Agency, Ann Arbor, MI. Emission Control Technology Div.
Publisher Sep 88
Year Published 1988
Report Number EPA-68-03-4044; EPA/460/3-88/008;
Stock Number PB90-235714
Additional Subjects Exhaust emissions ; Time series analysis ; Concentration(Composition) ; Hydrocarbons ; Carbon monoxide ; Tables(Data) ; Air pollution sampling ; Motor vehicle inspection ; Motor vehicle maintenance ; Emission factors
Library Call Number Additional Info Location Last
NTIS  PB90-235714 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/27/1990
Collation 213p
Abstract The program involved conducting twice-weekly I/M (Inspection and Maintenance) emission short tests on twenty-five late model gasoline-fueled vehicles over a 15-week time period. All of the twenty-five vehicles (1981 model year or later) were tested once in the morning and again later that same day following a soak period of at least three hours. The vehicles tested in the program were owned by Southwest Research Institute employees and were selected to represent a variety of vehicle types, emission controls, etc. Emission tests were conducted using two Bear Automotive Type 42-925 4-Gas Infrared Analyzers with generic software. Each emission test sequence included a 'Test Analyzer Specifications' ('TAS') sequence (i.e., 2500 rpm/idle test with emissions measured in both modes), a vehicle conditioning step utilizing three minutes of engine operation at 2500 + or - 300 rpm with the vehicle transmission in neutral, idling in neutral for 15 seconds, and finally a second TAS sequence. The tests were conducted to provide EPA with information regarding variability in short test emission results, impact of off-idle no-load preconditioning cycles on short test emissions, and emission differences between a fully-warmed vehicle and a 'soaked' vehicle having undergone minimum operation. Hydrocarbon and carbon monoxide emissions are reported for each vehicle in tabular and graphical form. Hydrocarbons are reported in ppm and carbon monoxide in percent.
Supplementary Notes Sponsored by Environmental Protection Agency, Ann Arbor, MI. Emission Control Technology Div.
Category Codes 68A
NTIS Prices PC A10/MF A02
Primary Description 200/05
Document Type NT
Cataloging Source NTIS/MT
Control Number 022222818
Origin NTIS
Type CAT