Taurus V6-182 3.0L (1987)
Engine Control Module: Customer Interest
Speed Control - Quits During ACCEL or COAST Modes
Article No.
SPEED CONTROL - QUITS WORKING DURING
87-16-6
"ACCEL" OR "COAST" MODES
FORD:
1986-87 TAURUS
LINCOLN-MERCURY: 1986-87 SABLE
WARNING:
This modification is authorized only for the listed engines. Performing this modification on other engine calibrations is unauthorized and
could create liability under applicable federal or local laws.
ISSUE:
Speed control that quits working when the "ACCEL" or "COAST" buttons are pressed may be caused by an electrical incompatibility of the
EEC IV processor and the steering wheel slip ring/brush assembly. The affected units are 1986-
87 built before 03/18/87 with 2.5L engines, 1986-87 units (49 States and Canada) built before 02/04/87 with 3.0L engines, and 1986-87 units
(California) built before 06/01/87 with 3.0L engines.
ACTION:
To correct this, install a new level EEC IV processor and clean and lubricate the steering wheel slip ring/brush assembly. Refer to the EEC
IV processor application chart on page 14 of this TSB for the correct service part.
NOTE:
After installing a new EEC IV processor, the curb idle (hardstop) must be reset to 760 RPM in Drive or 980 RPM in Park or Neutral on all
1986 3.0L Taurus/Sable vehicles.
If the following procedure is not performed, an improper idle speed and unacceptable driveability will result.
1.
Place transmission in Neutral or Park, turn A/C-HEAT selector lever to "off" position. Apply parking brake and block wheels.
2.
Bring engine to normal operating temperature. Check for vacuum leaks downstream of throttle plates. Service as required.
3.
Unplug SPOUT connector and make sure ignition initial timing is 10~ BTD +/- 2~. If initial timing is not within specification, service as required.
4.
Shut off engine and disconnect air bypass valve assembly connector.
NOTE:
Not disconnecting air bypass valve assembly will result in low throttle plate set and low idle speed (rolling idle cold and decel stalls).
5.
Remove PCV entry line at PCV valve.
6.
Install Orifice Tool T86P-9600-A (0.200 inch orifice diameter) in PCV entry line and start engine.
NOTE:
Not using the Orifice Tool in PCV entry line will result in a high throttle plate set and a high idle speed (rolling idle hot).
7.
Apply parking brake and block wheels. Idle a vehicle with an automatic transmission in Drive or Park.
8.
Adjust throttle plate stop screw for 760 RPM in Drive or 980 RPM in Park.
NOTE:
When setting hardstop RPM, it is critical to use an accurate tachometer.
9.
After idle has been set, shut off engine.
10.
Restart vehicle and idle for three (3) to five (5) minutes. Make sure idle speed is set to the specification in Step 8.
11.
If idle speed is not to the specification in Step 8, (760 RPM in Drive or 980 RPM in Park), repeat Step 8.
12.
Shut off engine.
13.
Disconnect negative battery terminal for five
(5)
minutes.
14.
Remove Orifice Tool and reconnect PCV entry line.
15.
Reconnect SPOUT connector.
16.
Reconnect air bypass valve assembly.
