This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Study of Vehicle Repair and the Effectiveness of Enhanced I/M Repair Confirmation Techniques
Annotation ability available
Sector:
Language:
English
Abstract
The advent of Enhanced Inspection/Maintenance (I/M) Programs brought a need for specialized diagnostics and repair procedures to enable the proper repair of failing vehicles. Unlike previous emission testing programs. Centralized Enhanced I/M Programs such as IM240 present a unique challenge for technicians - the inability to confirm the effectiveness of the repair without the use of similar equipment. This inability to confirm that proper repairs have been made to meet IM240 requirements coupled with a desire not to risk repeat vehicle failures inspired General Motors to investigate all known equipment and procedures relative to this subject GM has conducted a study to measure the effectiveness of various IM240 repair confirmation products and procedures in predicting IM240 outcomes. Appropriate statistical methods were employed to interpret the data acquired in this study. Also collected was vehicle repair and exhaust gas failure information on the vehicles tested. The intent of this paper is to present the results of this study.
Authors
Topic
Citation
Bradley, W., Youssef, M., and Graban, R., "A Study of Vehicle Repair and the Effectiveness of Enhanced I/M Repair Confirmation Techniques," SAE Technical Paper 962090, 1996, https://doi.org/10.4271/962090.Also In
References
- ‘Inspection/Maintenance Program Requirements Federal Register 57 215 52950 53014 November 1992
- “Everything You Ever Wanted to Know About Inspection and Maintenance EPA I/M Briefing Book Washington District of Columbia February 1995
- Joachim Staab Dieter Schurmann “Measurements of Automobile Exhaust Emissions under Realistic Road Conditions” SAE Warrendale Pennsylvania October 1987
- Kelly, Nelson A Groblicki, Peter J “Real-World Emissions from a Modern Production Vehicle Driven in Los Angeles General Motors Corporation Warren Michigan December 1992
- ‘An Update of IM240 Repair Verification Methods,” Sensors, Inc, Ann Arbor, Michigan July 1994
- Thomas Austin Larry Sherwood “Development of Improved Loaded-Mode Test Procedures for Inspection and Maintenance Programs,” SAE Warrendale Pennsylvania 1989
- Mickelsen J Clemmens, W IM240 Repair Verification An Inexpensive Dynamometer Method ' SAE 940431 February 1994
- Wasserman Neter Kutner Applied Linear Regression Models second Richard D Irwin, Inc Homewood, IL 0-256-07068-7 1989 101