Engine - Loss of Power or Surge

85ford04

Article No. 85-4-22

PERFORMANCE - POOR/SURGE
- 1.6L, 2.3L OHC, 5.0L, 5.0L H.O. AND 5.8L ENGINES EQUIPPED WITH CARBURETORS

FORD 1984 ESCORT, MUSTANG

LINCOLN-MERCURY 1984 LYNX, CAPRI

LIGHT TRUCK 1984 E & F SERIES, RANGER

Vehicles which exhibit loss of power or surge and are equipped with barometric pressure switches can be serviced by installing a new barometric switch.

Barometric pressure switches built between May 5, 1984, and November 21, 1984, (Date Code number on part between 1254 and 3404) can malfunction and cause vehicle loss of power or surge. These conditions occur when the vehicle is driven in elevations above 3,400 ft. and exposed to high temperature/humidity conditions. The high humidity/temperature conditions can shift the calibration point in the barometric pressure switch assembly; when the vehicle is below 4,000 ft., a leaner air/fuel ratio can exist, causing loss of power or surge.

Replace the barometric pressure switch with build date codes prior to 5/4/84 (1254) or after 11/21/84 (3404).

The date code numbers are ink-stamped on the switch assembly.

PART NUMBER PART NAME CLASS

E2AZ-12A243-A Barometric Pressure C
Switch
E2TZ12A243-B Barometric Pressure C
Switch
E3TZ-12A243-A Barometric Pressure C
Switch
E4FZ-12A243-A Barometric Pressure C
Switch
E43Z-12A243-A Barometric Pressure C
Switch --

WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP12243A84
TIME: 0.3 Hr. DLR. CODING: Basic Part No. 12A243 - Code: 53