Analysis of inspection/maintenance data from the Arizona program. Final report
The process of decoding VIN's (vehicle identification numbers) using a data base that maps each combination of VIN carline and engine code into the engine family (or families) which may be represented by the vehicle is described. Methods used in developing this data base also are summarized briefly. The instances in which major features of the emission control system can not be determined unambiguously from the VIN are identified. The actions taken to resolve these ambiguities with the assistance of auto manufacturers are described. The results of the manufacturer decoding and the methods employed when this assistance was not available are reported. An overview of the results on failure rates, emission levels, and repairs for the Arizona vehicles is provided. Industry-wide tables are presented and discussed to introduce the format used in the more detailed tables found in the appendices. A summary of major findings also is presented regarding the in-use performance of emission control technologies. Highlighted, in particular, are differences between open- and closed-loop catalyst systems and between closed-loop carburetors and fuel injection systems. Appendices have been prepared for this report. Appendices A and B list data files that are used to extract manufacturer, carline, and engine symbols from VIN's and then access the master VIN/engine family data base. The master data base itself is listed in its entirety in Appendix C. Appendix D provides a brief User's Guide to operation of the VIN-decoding software and a listing of the program. Appendix E briefly discusses statistical issues related to the precision of failure rate estimates. Appendix F provides failure rates by engine family.
- Research Organization:
- Energy and Environmental Analysis, Inc., Arlington, VA (USA)
- DOE Contract Number:
- AC01-78PE70045
- OSTI ID:
- 6756446
- Report Number(s):
- DOE/PE/70045-T21; ON: DE84014185
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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FEDERAL REGION IX
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& Utilization- Transportation- Land & Roadway