Engine - Surging/Bucking On Cruise or Deceleration

Article No. SURGING/BUCKING - 2.3L OHC - DURING DECEL
87-5-28 AND/OR CRUISE - VEHICLES BUILT PRIOR
TO 12/08/86

FORD 1987 MUSTANG

LINCOLN-MERCURY 1985-87 RANGER
1986-87 AEROSTAR

ISSUE: Surging and/or bucking during cruise or part throttle decel may be caused by a sticking or contaminated EGR Control Solenoid even though the EEC IV selftest may display a service code 11 (system pass).


ACTION: To correct this, install a new EGR Control Solenoid using the following service diagnostic procedure.

NOTE: Refer to the EGR Control Solenoid Application Chart on page 63 for the correct part application.

APPLICATION CHART

Vehicle Model Year EGR Control Solenoid

Ranger 1985-87 E7TZ-9D474-C

Aerostar 1986-1/2 E7TZ-9D474-C
(2/86)-1987

Aerostar 1986 Built Prior E69Z-9D474-A
To (2/86)

Mustang 1987 E7TZ-9D474-C

1. Check for correct routing of all vacuum lines, inspect for damage and repair or replace as required.

2. Disconnect and plug vacuum hose to the EGR valve. Road test vehicle.

3. If the condition is eliminated, replace the old EGR control solenoid assembly with a new design EGR control solenoid that has a bleed on the vacuum input.


PART NUMBER PART NAME CLASS

E7TZ-9D474-C EGR Control Solenoid C
E69Z-9D474-A EGR Control Solenoid C

OTHER APPLICABLE ARTICLES: Supersedes 86-18-12
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual
OPERATION: SP870528A
TIME: 1.1 Hrs. DLR. CODING: Basic Part No. 9D474 - Code: M4