Chamber Volume Control System

Satisfactory power performance is achieved by closing and opening the chamber volume control valves. High torque at low RPM is achieved when the valves are closed, whereas high power at high RPM is achieved by when the valves are opened. See Fig 1 . For the troubleshooting flowchart, see Fig 2 and Fig 3 .

1. Check the chamber volume control valve shaft for binding or sticking.
2. Check the chamber volume control valve for smooth movement.
3. Check that tab A of the chamber volume control valve is in close contact with the stopper when the bypass valve is fully open. See Fig 4 .
4. Check that tab B of the chamber volume control valve is in close contact with the full-close screw when 15 in. Hg of vacuum is applied to the diaphragm. See Fig 5 .
5. If any fault is found, clean the linkage and shafts with carburetor cleaner.
6. If the problem still exists after cleaning, disassemble the intake manifold and check the chamber volume control valve.

Fig 1: Identifying Chamber Volume Control System Circuit

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Fig 2: Chamber Volume Control System Flow Chart (1 Of 2)

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Fig 3: Chamber Volume Control System Flow Chart (2 Of 2)

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Fig 4: Checking Tab "A" Contact

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Fig 5: Checking Tab "B" Contact

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