1984-1986 CAPRI, MARQUIS 1984-1987 LYNX 1984-1992 MARK VII 1984-1994 CONTINENTAL, COUGAR, GRAND MARQUIS, TOPAZ, TOWN CAR 1986-1994 SABLE 1988-1989 TRACER 1991-1994 CAPRI, TRACER 1993-1994 MARK VIII
1985-1989 XR4TI 1988-1989 SCORPIO
1983-1994 RANGER 1984-1990 BRONCO II 1984-1994 BRONCO, ECONOLINE, F-150-350 SERIES 1986-1994 AEROSTAR 1988-1994 F-47, F-53 1991-1994 EXPLORER 1993-1994 VILLAGER
This TSB article is being republished in its entirety to update model applicability and to revise the part number of the Low Volatility Sealant.
EGO sensors can be contaminated if volatile types of silicone are used when servicing the engine. Volatile silicones can migrate throughout the system during the first one hundred hours of service. They are commonly found in liquid "silicone rubber" sealants and gasket material. These products are commonly sold in tubes and caulking-type cartridges.
When service is performed on the engine, only use new low volatility silicone sealant (F1AZ-19562-A) where specified. Also replace the contaminated EGO sensor if required.
DO NOT SUBSTITUTE CONVENTIONAL SILICONE RUBBER SEALANTS WHEN LOW VOLATILITY SILICONE SEALANT IS SPECIFIED.