Or, more specifically, the diverter valve can fail and cause a backfire on deceleration that could damage the exhaust system. Making the smog pump non-functional will not affect the driveability ...

Installing the intake manifold, water pump, motor mounts, and the remainder of ... 0.544-inch lift and 234 degrees of duration on the exhaust (duration measured at 0.050-inch lift).

Moreover, the engine, exhaust, and road noise help to further mask the sound of a fuel pump. Nevertheless, when a fuel pump begins to fail it gets louder, as the electric motor in the pump heats ...

According to a maintenance manual for the 1973 model, this was done using a wiper motor-powered pump connecting the black water tank to the exhaust, where it was plumbed in just upstream of the ...