Cold Engine Control Pressure Test
- Testing must be done on cold engine. Unplug connectors at auxiliary air valve and control pressure regulator. Place valve on pressure gauge in open position and operate fuel pump.
- Check pressure quickly. Reading should fall in shaded area of graph. Be sure to check air temperature and read correct area of graph.
- If control pressure is not correct, retest with new control pressure regulator. No servicing is possible.NOTE: Some models have a control pressure regulator with atmospheric pressure compensation. Pressures may vary slightly on these models.