How the Emissions check valve System works for 81-87 XJ6 and V12 XJS Jaguars, Part One.
The emissions check valve, part number EBC10196 on the website, is part of the air injection system, you know, those pipes that screw into the top of your cylinder head on the 81-87 XJ6 and all V12 XJS. The check valve allows the smog pump to push air into those pipes, but keeps the exhaust from flowing back through them when the pump isn't operating. This check valve typically rusts away and falls apart on you.
See our Jaguar Parts Store Catalog to order parts.