EGR Valve - Poor Performance/Fuel Economy
83ford21 Article No. 83-4-25POWER LOW/POOR FUEL ECONOMY/ PART THROTTLE RESPONSE - INCOMPATABILITY WITH EXISTING SELF-TEST PROCEDURES - 5.8L(W) ENGINE USED IN 49 STATES
LIGHT TRUCKS 1982/83 F SERIES AND BRONCO
CALIBRATIONS: 1-63T-R12, 1-64T-R12, 2-64Y-R11, 2-63Y-R11, 1-63T-R13, 2-63Y-R12, 1-64T-R13, 2-64Y-R12
On approximately December 15, 1982, the 5.8L(W) EEC engine calibrations used in under 8500 lb. GVW Bronco and F Series Light Trucks were revised to incorporate a new EGR valve and a new thermactor air control valve (the new thermactor valve is used on the automatic transmission vehicles only). This engine calibration revision was implemented to improve engine power and fuel economy. The new calibration numbers are: 1-63T-R13, 2-63Y-R12, 1-64T-R13, and 2-64Y-R12. A 49 State vehicle built prior to this calibration revision may be updated to the new level EGR/air control valve. The calibrations that are eligible for the revision are: 1-63T-R12, 1-64T-R12, 2-63Y-R11, and 2-64Y-R11.
The new revised automatic transmission production calibration, and any automatic transmission vehicle updated will require a new self-test procedure be used when diagnosing the EEC system.
Listed below are procedures for updating a vehicle with the power/fuel economy concern followed by a new self-test procedure to be used on these revised calibrations:
Procedure for revising calibrations with customer concerns.
1. Verify the vehicle is of the above applicable engine calibration level.
Calibrations: 1-63T-R12, 2-63Y-R11 - Manual Transmission 3.54/3.55/3.50 Axle Ratio Only
A. Remove and discard EGR valve (E0AE-9F483-AA) and replace with EGR valve (E0AZ-9F483-C). Refer to pertinent Truck Shop Manual for torque specification.
B. Locate engine code tag and with a Sharpie Pen, advance the calibration levels from R11 to R12 and R12 to R13 consecutively.
Calibrations: 1-64T-R12, 2-64Y-R11 - Automatic Transmission 3.55/3.54/3.50 Axle Ratio Only
A. Remove and discard EGR valve (E0AE-9F483-AA) and replace with EGR valve (E0AZ-9F483-C). Refer to pertinent Truck Shop Manual for torque specifications.
B. Remove and discard thermactor air control valve (D8EE-9F491-AA) and replace with control valve (E3AZ-9F491-A). Be sure to orient valve in same position as original.
C. Locate engine code tag and with a Sharpie Pen, advance the calibration levels from R11 to R12 and R12 to R13.
NOTE: Ensure that all hoses are secure and there are no air, vacuum or exhaust leaks.
Figure 12:
Procedure for self-testing automatic transmission vehicles with revised calibrations:
With the introduction of production calibrations 1-63T-R13, 2-63Y-R12, 1-64T-R13, and 2-64Y-R12 and the revision to the above-mentioned service calibrations, it is possible to obtain service code 11 or service code "44" when self-testing a properly operating EEC system. If a code "11" is produced, you may assume the system is functioning properly. If a code "44" is produced, the EEC system must be subjected to the following NEW quick test procedure:
1. After connecting the EEC III tester, (step 2 of quick test), disconnect and plug the vacuum hose coming from the thermactor air bypass valve (Figure 12). Remove the manifold vacuum line (black with red tracer) from the air cleaner bi-metal sensor (on top of the air cleaner lid) and install a 5/32" vacuum connector in the end of the hose. Install a 2 ft. section of 5/32" vacuum hose between the connector and the thermactor bypass valve (Figure 12).
2. Proceed with quick test at Step 3. A code "11" service code will be generated if the EEC III system is OK. If any other service codes are displayed at this time, including a "44" code, go to the referenced pinpoint test.
After all testing and/or services are completed, remove the 2" test hose and 5/32" connector and re-install manifold vacuum hose to the air cleaner bi-metal. Reconnect the hose to the thermactor bypass valve. Care should be taken to reconnect all hoses disconnected during the test.
Obtain an Authorized Modifications decal and list the date, dealer number and summary of alterations performed. 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.
PART NUMBER PART NAME CLASS
E0AZ-9F483-C EGR Valve R
E3AZ-9F491-A Air Control Valve C
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: M
TIME: "Actual Time" as defined in the Warranty and Policy Manual. DLR. CODING: Basic Part No. DRIVE Code: 53