Basic Charging Pressure While Checking Maximum Pressure

Checking the basic charging pressure in conjunction with checking of the maximum boost pressure




1. Up to and including 1985 models:
Isolate the APC system - e.g. by disconnecting the electrical leads from the solenoid valve.




2. As from 1986 models:
Switch off the control box switches, i.e. Knock detector to OFF, Solenoid valve to OFF




3. a. Manual transmission. The test should be started in 3rd gear with the engine speed under 1,500 r/min.
b. Automatic transmission. The test should be started with the gear selector in '1' and engine speed below 1,500 r/min.




4. Depress the accelerator to the floor.




5. When the engine speed approaches 3,000 r/min apply the brakes (keeping the accelerat6r pressed to the floor) so that the engine is put under full load at 3,000 r/min.
Read off the maximum pressure from the pressure gauge.




6. After the pressure has stabilized, note the reading on the gauge.

The basic pressure setting is only the initial setting for the function of the APC system and has no direct effect on the maximum charging pressure level, i.e. engine performance, achieved when the APC system is connected. Engine output is not increased by raising the basic charging pressure above the specification.

Maximum charging pressure, which produces the correct maximum output from the engine, is controlled by the function of the APC system.

7. If the basic pressure setting falls outside the specified tolerances adjust as described under 'adjusting the basic pressure of the charging pressure regulator'.
8. If the basic pressure setting falls within the specified tolerances, fit an antitamper seal to the control lever stud.
9. a. Reconnect the cables to the solenoid (up to and incl. 1985 models).
b. Remove the test loom (as from 1986 models).
10. Remove the pressure gauge.