Cold Engine Control Pressure Test
- Install pressure gauge in fuel line between fuel distributor and control pressure regulator. See TEST EQUIPMENT HOOK-UP in this article. Turn pressure gauge knob or lever to OPEN position.
- Unplug connector on control pressure regulator and turn ignition ON. Compare readings with cold engine control pressure graphs. See Figure. If pressures are incorrect, replace control pressure regulator.NOTE: All 1978-79 Volvo V6 engines have a vacuum connection from control pressure regulator to intake manifold or to open air. Cold or warm engine pressure readings will vary depending on whether this hose is connected or disconnected.