Repair Procedure

NOTE:
There are two types of air control valves used on 1987-89 Precis vehicles: Type F/F and Type A/F.





Type F/F is used on Federal specification vehicles with the three solenoid carburetor. Type F/F is found on automatic transaxle-equipped vehicles produced until 05/17/87 and manual transaxle-equipped vehicles produced until 06/02/87. This air control valve can be identified by the two vacuum lines attached to it. Refer to the illustration.

Type A/F is used on California specification vehicles with the 2 or 3 solenoid carburetor and Federal specification vehicles with the 2 solenoid carburetor. This air control valve can be identified by the single vacuum line attached to it. Refer to the illustration.





1. Disconnect the air hose and the vacuum hose(s). On vehicles with the Type F/F air control valve, mark each vacuum hose for proper reinstallation.





2. Remove and discard the 4 mounting screws from the air control valve. Do not remove the air control valve inlet base from the air pipe.





3. Remove the air control valve and reed valve from the inlet base. If working on the Type F/F valve, be careful not to drop the air control valve seat plate and "O"-ring.








Refer to the two illustrations for component identification of the Type F/F and Type A/F valves.





4. Inspect the air inlet nipple for the presence of carbon deposits. Also inspect the rubber air stopper for damage. If carbon deposits are found in the air nipple, or if the air stopper is damaged, the air control valve and reed valve must be replaced.

If no carbon deposits are found in the air nipple and no damage is found to the air stopper, only the reed valve should be replaced.





5. Install the new reed valve into the air control valve inlet base as shown in the illustration.

NOTE:
Be sure the reed valve opens toward the air pipe. This installation position is the same for Type F/F and Type A/F air control valve assemblies.





6. On the Type F/F air control valve, install the "O"-ring and seat plate. Make sure the "O"-ring is seated properly in the air control valve inlet base.





7. Install the air control valve to the inlet body using the 4 new screws. Tighten the screws in the sequence shown in the illustration. Tightening torque is 3 N-m (2.2 ft.lbs. OR 26.4 in.lbs.)





8. Inspect the secondary air filter case, filter, and hose for heat damage (melted or distorted condition). If heat damage is found, replace the damaged components.

9. Reattach the vacuum hose(s) and the air hose.