Legend Coupe V6-2675cc 2.7L SOHC FI (1988)
Variable Induction Control Valve: Testing and Inspection
Bypass Valve Test
CAUTION: Do not adjust the bypass valve full-close screw. It was preset at the factory.
1. Check the bypass valve shaft for binding or sticking.
2. Check the bypass valve for smooth movement.
3. Check that (A) of the bypass valve is in close contact with the stopper when the #2 and #8 hoses are disconnected from the diaphragm.
4. Check that (B) of the bypass valve is in close contact with the full-close screw when there is manifold vacuum applied to both diaphragms.
If any fault is found, clean the linkage and shafts with carburetor cleaner.
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If the problem still exists after cleaning, disassemble the intake manifold and check the bypass valve.