VALVE SHUTTER, 81-85 12A RX7
Shutter Valve, 81-85 12A RX7
81-85 12A Shutter Valve (Coasting Valve) FAQ-Click here—>81-85 12A Shutter Valve
The valve is attached to the intake manifold on the engine side, at the rear, under the carb, with a medium hose going to the air filter, and a small hose going to the metal vac hose rail, and is part of the smog equipment. It is a very common problem that can drive you, or unknowing mechanics nuts. The symptom is a weird “honking” noise at idle, or as the engine is returning to idle. When they are really bad, the idle is very rough. The carb has to be removed, or at least unbolted, and lifted up a few inches, to get to it. If the shaft it hooks to is badly worn, it should also be replaced, but the manifold has to be removed to do it.