For 1990-2009 cars

Problem | Action
--- | ---
The governor is out of adjustment. | Adjust the governor.
The governor is leaking. | Overhaul or replace the governor. Refer to Air Compressor Governor Valve Replacement .
The air compressor is leaking. |

1. Check the fittings, the bolts, and the mating surfaces.
2. Tighten or repair as needed.

The unloader is not functioning. | Overhaul the cylinder head assembly.
The governor is faulty. | Overhaul or replace the governor. Refer to Air Compressor Governor Valve Replacement .