Engine - Rough Idle At All Engine Temperatures

Article No.
91-2-6

January 23, 1991

IDLE THROUGH - 3.0L "SHO" - AT ALL ENGINE TEMPERATURES - VEHICLES BUILT BEFORE 8/01/90

FORD:
1989 TAURUS


ISSUE:
A rough idle may occur it all engine temperatures with VIP test codes indicating a malfunction of any or all of the following sensors...

^ Heated Exhaust Gas Oxygen Sensor (HEGO)

^ Throttle Position Sensor (TPS)

^ Engine Coolant Temperature Sensor (ECT)

^ Knock Sensor (KCS).

This condition may be caused by oversized or loose female terminals in the (-14A464-) wiring connector.

ACTION:
Perform normal EEC-IV system diagnostics, inspect the (-14A464-) wiring connector for oversized female terminals and, if required, install new terminals. Refer to the following procedure for service details.


1. Refer to the EEC-IV Quick Test in the 1989 Engine/Emissions Diagnosis Shop Manual, Volume H.

a. Perform normal EEC-IV system diagnostics to determine if the HEGO, TPS, ECT and KCS sensors are functioning correctly.

b. If no evidence of sensor failure is found, proceed to Step # 2.

Figure 1:

2. Locate connector (-14A464-) on wire assembly (-12A581-), Figure 1.

Figure 2:

This connector mates the 12A581 wire assembly to the 9D930 wire assembly at a point just below and aft of the throttle body. The (-14A464-) connector has eight (8) attached wires. Refer to Figure 2 for wiring colors and sensor sources.

3. Inspect the connector for oversized female terminals. Refer to Figure 2 for terminal identification.

4. Replace the connector terminals as necessary.


PART NUMBER PART NAME CLASS

E6DZ-14487-A Terminals (Pkg. of 4) BG

OTHER APPLICABLE ARTICLES:
None

WARRANTY STATUS:
Eligible Under Basic Warranty Coverage, Emissions Warranty Coverage

OPERATION DESCRIPTION TIME
910206A EEC IV Quick Test 0.5 Hr.
910206B EEC IV Quick Test & 1.0 Hr.
Replace Terminals As
Necessary

DEALER CODING
BASIC PART NO. CONDITION CODE
12A581 44

OASIS CODES:
608000, 608400, 609000, 609400