Disablement Testing of 1981-1982 Model Year Vehicles with Closed-Loop Emission Control Systems

摘要

The purpose of this report is to present the results of emission control system disablement testing of recent model year vehicles. Starting in 1981, Federal vehicles were designed to meet more stringent emission standards such that most employed computer controls utilizing exhaust emission feedback. Some vehicles prior to 1981 also used feedback systems, but it was not until 1981 that large quantity production of the systems occurred, along with a relatively finalized system design. Because EPA had little data on the emissions of these vehicles when they experienced emission control problems, a test program was designed to test many types of these vehicles. Included in the test program were four vehicle equipped with throttle body fuel injection (TBI).