Emission - oxygen sensor control, EGR, exhaust, M110 Removal and installation of anti-backfire valve 14—300 Removal and installation of anti-backfire valve Federal and California version model year 1977/78/79 Removal 1 Pull blue/purple vacuum line from anti-backfire valve. 2 Set hose clamps (arrows) back for approx. 2 cm. 3 Pull-of lower contour hose leading to air injection line for cylinder head. 4 Loosen both fastening screws (1) and unscrew. 5 Push anti-backfire valve in upward direction and remove from connecting hose of air injection line in rearward direction. Installation 6 For installation proceed vice versa. 4I*. 2 -300/1 USA 1977/78/79 Poprzedni Removal and installation of air pump Nowsze Removal and installation of intake manifold, replacement of gasket