Air Supply Control Valves Revision On Manual
89ford26
ENGINE EMISSIONS DIAGNOSIS SHOP MANUAL - 1985 - PAGE 3-11 - AIR SUPPLY CONTROL VALVES - FUNCTIONAL CHECK
Article No. 89-18A-8
FORD: 1985 LTD, MUSTANG, THUNDERBIRD
LINCOLN-MERCURY: 1985 CAPRI, COUGAR, MARQUIS
ISSUE: The Functional Check procedure for the Air Supply Control Valves, shown on page 3-11 of the 1985 Engine Emissions Diagnosis Shop Manual, Volume H, has been revised. A recall effort required the replacement of the Air Control/Bypass Valve. The modification will generate an Engine Running Code 95 during Self-Test and requires a change in Step 7 of the procedure.
ACTION: Refer to the pages following this TSB article for information on the revised procedure.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 4800
Emisslon Related Components 1985 3-11
TITLE BASIC PART NO.
Air Supply 9F491
Control Valves
DESCRIPTION
The Air Supply Control Valve is used in the Thermactor (secondary air) System.
The air control valve directs air pump output to the exhaust manifold or downstream to the catalyst system depending upon the engine control strategy.
Figure 1 Standard Air Control Valve:
Functional Chock
1. Verify that air flow is being supplied to the valve inlet by disconnecting the air supply hose at the inlet and verifying the presence of air flow with the engine at 1500 rpm. Reconnect the air supply hose to the valve inlet.
2. Disconnect the air supply hoses at outlets A and B (Fig. 1).
3. Remove the vacuum line at the vacuum nipple.
4. Accelerate the engine to 1500 rpm. Air flow should be heard and felt at outlet B with little or no air flow at outlet A (Fig. 1).
5. With the engine at 1500 rpm, connect a direct vacuum line from any manifold vacuum fitting to the air control valve vacuum nipple. Air flow should be heard and felt at outlet A with little or no air flow at outlet B.
6. If the valve is the bleed type, less air will flow from outlet A or B, and the main discharge will change when vacuum is applied to the vacuum nipple.
7. Restore all connections.
a. If the above conditions (specified in the preceeding steps) are met and a Ford Authorized Modifications Decal states the modification included installing an air control valve, part number E4DE-9F491-AA or E4DZ-9F491-A, then testing is complete. The installation of this valve is known to produce an Engine Running Code 95.
b. If the above conditions are not met, replace the air control valve.
3-12 1985 Emission Related Components
TITLE BASIC PART NO. SYMBOL
Air Supply Pump 9A486
Figure 1 - 11-Cubic Inch Thermactor Air Supply Pump:
Figure 2 - 19-Cubic Inch Thermactor Air Supply Pump:
DESCRIPTION Passenger Cars and Light Trucks
The Air Supply Pump is a belt driven, positive displacement, vane type pump that provides air for the thermactor system. It is available in 11-cubic inch and 19-cubic inch sizes, either of which may be driven with different pulley ratios for different applications. The 11-cubic inch pump (Figure 1) receives its air through a remote filter attached to the air inlet nipple or through an impeller type centrifugal air filter fan. The 19-cubic inch pump (Figure 2) uses an impeller type centrifugal air filter fan which separate dirt, dust, and other contaminants from the intake air by centrifugal force. The air supply pump does not have a pressure relief valve, a function performed by the bypass valve. A description of the Thermactor System is in Section 10.
Functional Check
1. Check belt tension, and adjust to specifications.
2. Disconnect air supply hose from bypass control valve.
3. The pump is operating satisfactorily if air flow is felt at the pump outlet and the flow increases as the engine speed is increased.
Do not pry on the pump to adjust belt. The aluminum housing is likely to collapse.