Engine - Intermittent High Idle/MIL ON

91ford18

Article No. 91-10-6


^ IDLE - HIGHER THAN NORMAL - 5.0L AND 5.0L H.O.

^ LAMP - MALFUNCTION INDICATOR LIGHT (MIL) - INTERMITTENTLY FLASHES - 5.0L AND 5.0L H.O.


FORD: 1988-91 CROWN VICTORIA, MUSTANG

LINCOLN-MERCURY: 1988-90 TOWN CAR 1988-91 GRAND MARQUIS, MARK VII


ISSUE: An intermittent high idle, a MIL light that comes on or EEC Service Codes 31 or 32 appearing may be caused by a loose connection of the wiring to EVP (EGR), TPS, ACT, ISC, CP, Knock Sensor or Injectors. The 10 way connector is located at the top rear of the intake manifold.

ACTION: Inspect the 10 way connector for loose connections. If necessary, install two (2) new jumper wiring assemblies which provide for better connections and more slack in the wiring harness. Refer to the following procedure for service details.

Figure 1:

1. Identify the sensor causing the concern.

2. Locate the appropriate 10 way connector, Figure 1.

3. Separate both connectors.

Figure 2:

4. Carefully mate the new added jumpers (F1ZZ-12K510-A and F1ZZ-12K510-B) to the proper terminals as shown in Figure 2.

a. Make sure the wires do not touch the hot EGR valve.


b. Use two (2) tie straps (95873-S) to secure the jumpers to the A/C suction hose.

c. If the vehicle is non-A/C, attach the jumpers to the existing 12A581 wiring assembly at the dash panel.

5. Make sure that the connectors have been fully mated and are completely locked.

6. Check the vehicle for proper operation.

PART NUMBER PART NAME CLASS

F1ZZ-12K510-A Jumper Wiring Assy. C
F1ZZ-12K510-B Jumper Wiring Assy. C
95873-S Tie Strap C

OTHER APPLICABLE ARTICLES: None
SUPERSEDES: 90-21-5
WARRANTY STATUS: Eligible Under Basic Warranty Coverage, Emissions Warranty Coverage
OPERATION DESCRIPTION TIME
911006A Install Jumper Wiring 0.9 Hr.
Assemblies And Tie Straps
DEALER CODING
BASIC PART NO. CONDITION CODE
12A581 44
OASIS CODES: 203000, 203200, 206000, 619400