Vacuum Check Valve Inspection
NOTE:
Numbers in parenthesis in the test steps correspond to those in figure. See Fig 1
.
- Remove the vacuum check valve (1) from the auxiliary intake air system. See Fig 1 .
- Connect Hand Vacuum Pump (J 23738-A), or equivalent, to the intake manifold side of the vacuum check valve. See Fig 2 .
- Attempt to apply a vacuum of 10 in. Hg to the vacuum check valve.
- The check valve should NOT hold vacuum pressure.
- Disconnect the vacuum pump from the check valve.
- Connect the hand vacuum pump to the other side of the check valve.
- Apply a vacuum of 10 in. Hg to the vacuum check valve.
- The check valve SHOULD hold vacuum pressure.
- Replace the vacuum check valve if the valve failed either of the previous tests.
- Install the vacuum check valve (1).
- Ensure check valve (1) is installed with the side that holds vacuum toward the intake air control solenoid (4). See Fig 1 .