Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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 .
- Check the chamber volume control valve shaft for binding or sticking.
- Check the chamber volume control valve for smooth movement.
- 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 .
- 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 .
- If any fault is found, clean the linkage and shafts with carburetor cleaner.
- If the problem still exists after cleaning, disassemble the intake manifold and check the chamber volume control valve.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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