EVP Sensor - Momentary Idle Speed Increase

84ford1

Article No. 84-19-12-S (dated 12/05/84)

IDLE SPEED - 3.8L CFI - MOMENTARY INCREASE


FORD 1984 T-BIRD, LTD, MUSTANG

LINCOLN-MERCURY 1984 COUGAR, MARQUIS, CAPRI

CALIBRATIONS: All 3.8L with EEC IV CFI

This article supersedes article 84-19-12 (dated 09/12/84) . The date code on the EVP Sensors has been changed.

An intermittent open circuit in the EVP Sensor, the wire harness or the connectors can generate an erroneous EGR signal that may cause a lean idle condition. The engine may begin to stall; however, the processor senses this and attempts to correct by energizing the idle speed control motor. The idle speed is momentarily increased. This condition usually occurs intermittently.

1. Check the wire harness and mating connector of the EVP sensor for possible intermittents and service or replace as necessary.
2. Replace the EVP sensor (E43Z-96428-B) that exhibits a date code prior to October 12, 1984 (4K12B).

NOTE: EVP sensors E43F-9G428-A1A/A1B should not be replaced unless Service Code 31 is obtained during Quick Test.


PART NUMBER PART NAME CLASS

E43Z-9G428-B EVP Sensor A

OTHER APPLICABLE ARTICLES: 84-19-12
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9428A84
TIME: 0.5 Hr. DLR. CODING: Basic Part No. 9G428 Code: 41