Power Booster Vacuum Test
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
- Connect vacuum gauge to booster check valve with short length of hose and T-fitting. See Figure.
- Start and run engine at curb idle speed for one minute.
- Observe the vacuum supply. If vacuum supply is not adequate, repair vacuum supply.
- Clamp hose shut between vacuum source and check valve.
- Stop engine and observe vacuum gauge.
- If vacuum drops more than one inch Hg (33 millibars) within 15 seconds, booster diaphragm or check valve is faulty.
| 1 - TEE FITTING |
| 2 - SHORT CONNECTING HOSE |
| 3 - CHECK VALVE |
| 4 - CHECK VALVE HOSE |
| 5 - CLAMP TOOL |
| 6 - INTAKE MANIFOLD |
| 7 - VACUUM GAUGE |