Evaluation of Applicability of a Lead-Sensitive Test Paper as a Diagnostic Tool for Detecting Habitual Misfueling of Catalyst-Equipped Motor Vehicles

摘要

Use of leaded fuel in a catalytic converter equipped vehicle (misfueling) adversely affects the ability of the catalyst to reduce undesirable emission levels through poisoning of the catalytic material. A quick reliable method of detecting habitual misfueling would be a valuable diagnostic tool for detecting lead poisoned catalysts. PLUMBTESMO is a lead sensitive test paper that according to its manufacturer's product literature can be used to detect metallic lead. When applied to the inside surface of a tailpipe containing lead deposits, the originally white test paper develops red spots and streaks within a few minutes. This test can be applied to cold or hot tailpipes. The reaction appears to take place in less time when the tailpipe is hot. The I/M staff has conducted an evaluation of PLUMBTESMO on a sample of vehicles in the Ann Arbor area. This report describes that evaluation and its results.