| Table 1: | No Vacuum |
| Table 2: | Low Vacuum or Fluctuating Vacuum Gauge |
Notice: Test should be taken with the engine running. Vacuum should reach --70 kPa (21 in Hg) minimum at sea level within 30 seconds. Elevation (feet/meters above sea level) will affect the vacuum reading you will see on the vacuum gauge.
Problem | Action |
|---|---|
Broken drive belt | Replace the drive belt. |
Defective belt tensioner (if equipped) | Replace the belt tensioner. |
Pulley for the vacuum pump is loose | Replace the pulley. |
Broken vacuum line | Locate and repair the break in the vacuum line. |
Notice: Test should be taken with the engine running. Vacuum should reach --70 kPa (21 in Hg) minimum at sea level within 30 seconds. Elevation (feet/meters above sea level) will affect the vacuum reading you will see on the vacuum gauge.
Problem | Action |
|---|---|
Defective connection for vacuum gauge | Check connections and repair if necessary. If the connections are good, replace the vacuum gauge and retest. |
Wrong drive belt | Replace the drive belt. |
Defective belt tensioner (if equipped) | Replace the defective belt tensioner (if equipped). |
Pulley loose on vacuum pump shaft | Replace the defective belt tensioner (if equipped). |
Defective vacuum pump | Replace the vacuum pump. |
Defective accessories | Locate and repair or replace the defective accessory(s). |
Elevation | Vacuum |
|---|---|
Sea Level | -70 kPa (21 in) |
152 m (5,000 ft) | -60 kPa (18 in) |
3048 m (10,000 ft) | -49 kPa (14 in) |
4572 m (15,000 ft) | -40 kPa (12 in) |
