F 150 2WD Pickup V8-351 5.8L (1986)
Idle Speed: All Technical Service Bulletins
Vehicle - High Altitude Modification
Article No. 86-15-16
ALTITUDE (5.8L (W)) - MODIFICATION OF SEA LEVEL CALIBRATION FOR ALTITUDE APPLICATION - VEHICLES WITH 4V
CARBURETORS ONLY - OVER 8500 LBS. GVWR
LIGHT TRUCK 1986 E SERIES, F SERIES
CALIBRATION: 5-76J-R17 (Manual Transmission)
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.
Customers who may have relocated and/or continually operate the subject vehicles in high altitude (above 4,000 ft. alt.) may have the following
procedure performed to improve performance.
1.
Remove existing PCV valve and replace with new PCV valve (part number D90Z-6A666-A).
2.
Advance initial ignition timing 6~ from nominal setting of 8~ BTDC to 14~ BTDC. Refer to 1986 Light Truck Shop Manual, Volume B, Section
23-01.
3.
Increase choke pull down hard gauge setting to .193". Refer to 1986 Light Truck Shop Manual, Volume B, Section 24-26.
4.
Remove existing choke cap and replace with new choke cap 47R-776-A (part number E5PZ-9848-B).
5.
Reset hi-cam and curb idle speeds to specification (refer to Vehicle Emission Control Information Decal).
Obtain a Vehicle Emission Control Information Update Decal (available at all Ford or Lincoln-Mercury dealers) and fill in the appropriate information
as indicated.
If the vehicle is returned to continuous sea level (below 4,000 ft. alt.) operation, the above procedure should be reversed and the Vehicle Emission
Control Information Update Decal should be removed from the vehicle.
PART NUMBER
PART NAME
CLASS
D90Z-6A666-A
PCV Valve
A
E5PZ-9848-B
Choke Cap
C
OTHER APPLICABLE ARTICLES: 85-21-16
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9514A86
TIME:
1.3 Hrs. DLR. CODING: Basic Part No. DRIVE - Code: N4, P6, T5
