Regal V6-260 4.3L DSL (1985)
and position opposite end of hose in a small container.
f.
Start engine and observe pressure. If pressure is still high, check and adjust HPAA as described in steps 15 and 16.
15.
Check HPAA solenoid and pressure regulator operation as follows:
a. Remove HPAA solenoid from engine.
b. Apply a minimum of 30 psi air pressure to assembly, first from pump side, then from outlet side.
c. If air does not flow freely in both directions, replace solenoid.
d. Remove pressure regulator from solenoid. If solenoid plunger does not move freely, the solenoid must be replaced.
16.
To adjust HPAA solenoid, proceed as follows:
a. Install HPAA solenoid assembly.
b. Disconnect electrical connector from MAP sensor.
c. Start engine and note housing pressure, which should now read 6-8 psi.
d. If pressure reading is not within specifications, remove HPAA assembly from engine and the line fitting from pressure regulator. Insert a
suitable hex key into regulator and turn adjustment screw as necessary to bring reading within specifications.
e. Install HPAA assembly and recheck housing pressure.
