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Fuel Injector Types
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TSB 98-9-9 Fuel Injector Testing Information

Publication Date: MAY 11, 1998

FORD:
1992-1994 TEMPO
1992-1997 PROBE, THUNDERBIRD
1992-1998 CROWN VICTORIA, ESCORT, MUSTANG, TAURUS

LINCOLN-MERCURY:
1992-1994 TOPAZ
1992-1997 COUGAR
1992-1998 CONTINENTAL, GRAND MARQUIS, SABLE, TOWN CAR, TRACER
1993-1998 MARK VIII
1999 COUGAR

LIGHT TRUCK:
1992-1996 BRONCO
1992-1997 AEROSTAR
1992-1998 ECONOLINE, F-150, F-250 LD, RANGER, SUPER DUTY F SERIES
1993-1998 EXPLORER
1997-1998 EXPEDITION, MOUNTAINEER
1998 NAVIGATOR

ISSUE: In-vehicle testing of multi-port fuel injectors, using Rotunda Fuel Injector Tester 164-R3750, will no longer be warranty reimbursable. Lack of tester updates and improvements in the design of fuel injectors has led to the discontinuation of this Service Procedure. A significant number of warranty returned injectors test within engineering specification. All diagnostic tools and procedures are being re-evaluated for effectiveness.

ACTION: Acceptable fuel injector tests include: Service Bay Diagnostic System (SBDS) relative injector flow, fuel pressure decay, cylinder drop/balance techniques, and misfire detection tools. Using the acceptable fuel injector tests eliminates the possibility of a misdiagnosed fuel injector concern due to inaccuracy of this test equipment. Since the introduction of Deposit Resistant Injectors in 1991, lean fuel conditions caused by deposit formation have been eliminated. Diagnostic concentration is on single fuel injector inoperative concerns in a particular cylinder.

NOTE: CLEANING OF FUEL INJECTORS IS NOT WARRANTY REIMBURSABLE EXCEPT FOR THE FOLLOWING VEHICLES:
1992-96 AEROSTAR 4.0L
1992 EXPLORER 4.0L
1992 RANGER 4.0L
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Any single injector (MAF or bench) should measure 13-15 Ohms; a bank of 3 (6-cyl MAP) should measure 4-5 Ohms; a bank of 4 (V8 MAP) should measure 3-3.5 Ohms.

See also:
. . .