Engine - Hesitation/Lack Of Power/Rough Idle

88ford18

FUEL INJECTORS - DIAGNOSTIC AND CLEANING TIPS

Article No. 88-17-11

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 on page 69 of this TSB 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-B

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:


a. 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.

b. 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 CLASS

E6AZ-19579-C Power Flush Injector B
Cleaner
D9AZ-19579-BA Carburetor and Combustion AM
Chamber Cleaner

OTHER APPLICABLE ARTICLES: 86-13-22 Supersedes 87-9-8
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION: Refer to the Service Labor Tie Standards Manual
DLR. CODING: Basic Part No. 9F593
Condition Code: 49



DIAGNOSTIC CHART