Purge Solenoid - Tip-In Stumble After Deceleration

85ford16

Article No. 85-16-19


TIP-IN STUMBLE AFTER PROLONGED DECELERATION - (ALL 2.0/2.3L WITH MCU)


LIGHT TRUCK 1983-84 RANGER

CALIBRATIONS: ALL WITH MCU, 2.0L AND 2.3L

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.

Concern vehicles may exhibit tip-in stumbles after prolonged deceleration. This may be caused by a possible overlap in specifications which can allow the electric purge solenoid to remain actuated for a short period of time while the carburetor bowl vent is opened. This can result in a slight vacuum in the carburetor bowl causing a lean condition. This lean condition results in a stumble on tip-ins after a prolonged deceleration.

Figure 13 - Purge Control System - Current Design:

Figure 14 - After Change:

To resolve this condition, the following procedure is recommended. Remove the electric solenoid (E1TE- 9C915-BA) and replace it with a mechanical purge control valve (9B963) and a vacuum delay valve (12A- 091). Add a "T" fitting on the hose coming from the EGR valve and route the vacuum signal to the mechanical purge control valve and the vacuum delay valve. Hose routing is shown on the schematics (Figures 13 and 14).

Authorized Modifications Decal:

Obtain an Authorized Modifications Decal and list the date, dealer number, and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.
PART NUMBER PART NAME CLASS

E3TZ-9B963-A Purge Control Valve C
E3AZ-12A091-E Vacuum Delay Valve R
373846-S 3/16" Vacuum Tee BR


OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP9915A85
TIME: 0.4 Hr. DLR. CODING: Basic Part No. 9C915 - Code: M2