Vacuum Control Valve
- Warm engine to normal operating temperature. Ensure A/C is turned off. With engine idling, ensure no suction exists on union pipe at Vacuum Control Valve (VCV). See Fig 1.
- Gradually increase engine to 3000 RPM. Ensure suction now exists on union pipe. If suction does not exist, remove VCV. Using vacuum pump, apply 2.8 in Hg of vacuum to port "S" on VCV. See Fig 1.
- Apply air pressure to port "Y". Ensure air flows from port "Z". Remove vacuum pump. Apply air pressure to port "Y". Ensure air does not flow from port "Z". Replace VCV if defective and recheck operation. If VCV is okay, check EVAP Vacuum Switching Valve (VSV).
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