Mark VII V8-302 5.0L HO (1986)
Engine Control Module: All Technical Service Bulletins
Engine - Road Load Surge and/or Lean Misfire
Article No. 86-3-28
SURGE AT STEADY SPEED - 5.0L SFI - NEW PROCESSOR
MISS - AT STEADY SPEED - 5.0L SFI - NEW PROCESSOR
LINCOLN-MERCURY 1986 CONTINENTAL, MARK VII
CALIBRATIONS: All with 5.0L EEC IV - SFI
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.
Road load surge and/or lean misfire during 42-55 mph cruise can be serviced by installing a new processor. It is also necessary to remove the vacuum
control assembly on 49 States vehicle calibrations.
1.
Perform EEC IV Self-Test. Verify all codes and service as necessary.
2.
If condition was not eliminated, proceed to Step 3.
3.
Start engine and allow to run until stabilized temperature is reached.
4.
Road test vehicle at a steady speed so that engine runs at 1100-1300 rpm, maintaining a vacuum reading between 5-19" Hg.
NOTE:
Vehicle should be driven in this mode for no less than one minute to reset lean cruise timer. If not, repeat drive for at least one additional
minute.
5.
If surge and/or misfire occurs, proceed to Step 6.
6.
Remove processor assembly and replace with part number E6SZ-12A650-YD for 49 States, and part number E6SZ-12A650-XD for California.
Figure 24
7.
On 49 State applications only, remove gray and white vacuum delay valve and elbow. See Figure
24.
The delay valve is on the right hand side of engine near rocker cover and No. 3 spark plug.
8.
Attach the black elbow that was connected to the delay valve to thermactor diverter valve.
