Engine - Road Load Surging
Bulletin No. 81-21Article No. 81-21-8
Date: October 16, 1981
SUBJECT:
SURGE DURING ROAD LOADS AND CROWDS
FORD
1981 ESCORT, 1982 EXP WITH AUTOMATIC TRANSMISSION AND AIR CONDITIONING
LINCOLN MERCURY
1981 LYNX, 1982 LN7 WITH AUTOMATIC TRANSMISSION AND AIR CONDITIONING
Calibrations Affected:
1-04C/Re-13A or R-14A
1-04Q/Re-11A or R-12A
California Only
WARNING: THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE CALIBRATIONS. PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.
Engine surge during road loads or crowd conditions may be alleviated by performing the following procedure. The spark strategy currently is to switch the distributor vacuum from spark port to EGR port, when the air conditioning is on. This revision maintains spark port to the distributor, venting the vacuum line at idle.
1. Locate the vacuum solenoid mounted to dash panel above bracket master cylinder (Figure 18).
2. Disconnect rubber tubing (attached to the yellow tubing) from the top port of the vacuum solenoid and cap (380614-S) the open port of the vacuum solenoid (Figure 18).
3. Disconnect the connector block from the same vacuum solenoid and (using side cutters or similar too) separate the connector block (white tubing from the black tubing).
4. Install the 3-way tee (373846-S) into the open end of the sectioned connector block (attached to the black tubing). Connect the rubber tubing (attached to the yellow tubing) to the 3-way tee (Figure 18).
5. Add a piece of 5/32" rubber tubing (1.5" long x 5/32 distributor vacuum) to the 3-way tee and connect to the middle port of the vacuum solenoid (Figure 18).
6. Disconnect and discard the piece of the sectioned connector and in-line connector block (attached to the white tubing) and install a 900 elbow adaptor (387980-S) into the rubber tubing and connect a piece of 7/32" rubber tubing (D8PZ-12226-A) (14" long x 7/32 distributor vacuum) between the 90 ° elbow and the "VAC" port of the thermactor idle vent valve (IVV) (D6DZ-9G328-A) (Figure 18).
7. Connect a piece of 5/32 rubber tubing (DOPZ12226-B) to the bottom port of the vacuum solenoid and the open port of the IVV (Figures 17 and 18).
8. Attach a bundling strap (95874-S) to retain the white tubing (near the 1.5" long rubber tubing) to the yellow tubing near the vacuum solenoid (Figure 18).
9. Attach a bundling strap (95874-S) to secure the 14" x 7/32" vacuum hose (from Step 6) to fuel bowl vent hose (Figure 19).
10. Verify vacuum hose routing per Figure 17.
11. Install a revised engine vacuum hose routing diagram by cutting out one decal from those printed in Figure 18a. Clean the surface of the existing Vehicle Emission Control Information decal located on the underside of the hood. Place the new vacuum hose routing diagram over the original routing diagram on the VECI decal. Attach securely using two overlapping clear plastic decal shields (normally used for attaching Authorized Modifications decals). Make sure that the new diagram is completely covered by the plastic shield.
12. Obtain an Authorized Modifications decal and list the date, dealer number and alterations performed as shown. Select a prominent place adjacent to the Vehicle Emission Control Information decal suitable for installing the Authorized Modifications decal Clean the area, install the decal and cover it with a clear plastic decal shield.
WARRANTY STATUS:
Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION:
SP-9328-A-81
TIME: 0.6 Hr.
DLR. CODING: Basic Part No. DRIVE - Code: H8