Honda Accord/Civic/Prelude 1973-1983 Repair Guide

Anti-Afterburn Valve



1979-82 1751cc engines have an anti-afterburn valve. This unit is used only on models with manual transmission. The valve lets fresh air into the intake manifold when it senses sudden increases in manifold vacuum. The valve responds only to sudden increases in vacuum and the amount of time it stays open is determined by an internal diaphragm which is acted on by the vacuum level.