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TSB 88-17-11 Injector Diagnosis
Publication Date: AUGUST 17, 1988

FORD: 1983-88 ESCORT, THUNDERBIRD
1984-88 EXP
1986-88 MUSTANG, TAURUS, CROWN VICTORIA
1988 TEMPO
LINCOLN-MERCURY: 1983-86 LYNX
1983-88 COUGAR
1986 CAPRI
1986-88 SABLE, GRAND MARQUIS, MARK VII, CONTINENTAL, LINCOLN TOWN CAR
1988 TRACER, TOPAZ
MERKUR: 1987-88 XR4TI
1988 SCORPIO
LIGHT TRUCK: 1985-88 RANGER, F-SERIES, BRONCO
1986-88 E-SERIES, AEROSTAR

ISSUE: Port fuel injected vehicles that have cold hesitation, lack of power, rough engine idle or a surging condition at steady speeds may be caused by dirty fuel injectors. When no-detergent fuel is used, deposits form on the fuel metering surfaces of the fuel injectors. The deposits that form reduce the fuel flow resulting in a lean condition.

ACTION: To correct this, follow normal diagnostics as shown in the Engine/Emissions Diagnosis Manual, Section 2. If you get to a step that instructs you to replace a fuel injector, FIRST try cleaning the injector with the Rotunda Tester/Cleaner, 113-00001. If the condition still exists after cleaning, the injectors should be flow tested to make sure they are functioning properly. If the flow test indicates lean injectors, a second cleaning may be necessary because of severe injector fouling. Refer to the diagnostic chart for step-by-step instructions.
CAUTION: NEVER ATTEMPT TO FLOW TEST INJECTORS WITH THE CLEANING SOLUTION MIXTURE. THIS WILL PRODUCE FALSE TEST RESULTS. ONLY USE CLEAN GASOLINE.

In cases where fouled injectors were the cause of the driveability concern, it should be recommended to the customer that a better quality gasoline be used. The Owner Guide, Maintenance Schedule and Operating Guide address the fuel quality issue.

NOTE: IT IS VERY IMPORTANT THAT THE CORRECT CLEANING SOLVENT IS USED WITH THE ROTUNDA TESTER/CLEANER. THE CORRECT CLEANING SOLVENTS ARE:
Power Flush Injector Fluid E6AZ-19579-C
Carburetor and Combustion Chamber Cleaner D9AZ-19579-BA

DO NOT USE
Injector and Fuel System Cleaner E6AZ-19579-A

Rotunda Tester/Cleaner Equipment Update
The following items are available for use with the Rotunda Tester/Cleaner:

3.8L ENGINE INJECTOR ADAPTER HARNESS 113-00005
To flow test injectors on the 1988 3.8L with EFI, a wire harness is available to allow a direct connection to the injector harness 8-pin connector.
2B SPAN TUBE 113-00003
To flow test the Tracer 1.6L, Light Truck 7.5L and 3.8L supercharged engine.
CAUTION: NEVER LEAVE CLEANING SOLUTION IN THE ROTUNDA TESTER/CLEANER. ALWAYS DRAIN THE TANK AND LINES COMPLETELY.

PART NUMBER PART NAME
E6AZ-19579-C Power Flush Injector Cleaner
D9AZ-19579-BA Carburetor and Combustion Chamber Cleaner

OTHER APPLICABLE ARTICLES: 86-13-22
SUPERSEDES: 87-09-08
WARRANTY STATUS: Eligible Under Basic Warranty Coverage

OPERATION DESCRIPTION TIME
881711 Refer to the Service Labor Time Standards Manual

For other TSBs, check here.

See also:
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