Record Display for the EPA National Library Catalog


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. 08/27/1990
Collation 213p
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.