Carburetor - Hard Start When Warm

88subaru02

NUMBER: 02-51-86


DATE: 01-13-86


APPLICABILITY
1985 AND -86 4 DOOR SEDAN AND STATION WAGON
4WD CARBURETED VEHICLES EXCEPT CALIFORNIA MODELS

SUBJECT:
HOT ENGINE RESTARTING


Should you encounter a vehicle that is difficult to restart when the engine is hot, carburetur float chamber pressure may be the cause. Follow the instructions for the installation of a carburetor vent control kit.

MATERIAL REQUIRED:

1 - Carburetor Vent Control Kit Part Number 16018AA000

Containing:

^ 1 - Solenoid valve
^ 1 - Canister vacuum hose stay
^ 1 - Vacuum cap
^ 1 - Vacuum tee
^ 2 - Vacuum hoses, 3-3/8" long and 5-15/16" long
^ 1 - Female electrical harness connector
^ 1 - Wire tap quick connector

TOOLS REQUIRED

1 - Diagonal Cutter
1 - Needle Nose Pliers
1 - Ratchet with 10 mm, 12 mm Sockets and an extension
1 - 10 mm Combination Wrench
1 - Tape Measure or 12" Ruler

STEP 1)
^ Remove the negative battery terminal
^ Remove the spare tire assembly
^ Remove the air cleaner assembly





STEP 2) Remove the float bowl vent hose from the carburetor and cut
3/4" off the end of the hose. Reconnect the hose. See Figure 1.





STEP 3) Locate the air control valve (ACV) found next to the canister vacuum stay. Find the curved vacuum hose connecting the valve with the rear of the carburetor. Measure 6" to the center of the hose curves and cut the hose. Then cut 1/2" from the lower section of the hose and install the vacuum tee from the kit. See Figure 2.





STEP 4) Unbolt and remove the canister vacuum stay and replace it with the new vacuum stay from the kit. Bolt the soleniod valve from the kit and the new vacuum stay back to the thermostat housing. See Figure 3.


NOTE:
WHEN EXCHANGING VACUUM STAYS, MAKE SURE ALL HOSES ARE RECONNECTED PROPERLY.





STEP 5) Install the straight end of the 3-3/8" vacuum hose from the kit to the new vacuum tee and the bent end to the solenoid. Then install bent end of the 5-5/16" vacuum hose to the connection at top of the vacuum stay and the straight end of the solenoid. Use the new cap to block off the open connection on the solenoid. See Figure 4.





STEP 6) Install the female electrical harness connector to the male solenoid connector and route the wires through the air cleaner bracket clamp. See Figure 5.


STEP 7) Remove the bolt from the air cleaner bracket, secure the yellow wire from the connector to the bolt and reinstall.

STEP 8) Route the black wire with the white tracer along the wiring harness behind the intake manifold using the existing wire ties.

STEP 9) Locate the air control valve solenoid wiring connector. The male connector coming from the wiring harness to the (ACV) solenoid has two wires, yellow (Y) and black with a white tracer (BW).





STEP 10) Using the wire tap connector, splice the black wire with the white tracer from the new solenoid to the black wire with the white tracer from the (ACV) solenoid together. See Figure 6.


NOTE:
AFTER SECURING THE WIRE TAP CONNECTOR, TWIST IT BACK AND FORTH TO MAKE SURE THE INSULATION IS CUT AND A GOOD CONNECTION IS MADE BETWEEN THE WIRES.

To test the operation of the new solenoid:

^ Make sure the ignition switch is off.
^ Remove the 5-15/16" hose from the connection at the top of the vacuum stay and blow air into it. No restriction should exist.
^ Turn the igntion on
^ Blow air through the same hose and it should be restricted. If it is not recheck hose routing and electrical connections.

This procedure can be claimed for vehicles within the terms of the Subaru Limited Warranty using:

Operation Number Time Failure Code:
A141-041 0.8 DFE-48