Midsize LTD V6-232 3.8L (1985)
Air Injection Control Valve: Technical Service Bulletins
Air Supply Control Valves Revision On Manual
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.
