Carburetor - Sags/Hesitation On Hot Restart

86chrysler4

Models


1984-1985 Passenger Cars With 2.6L Engine & Federal Emissions


Subject

Fuel Foaming


Index

DRIVEABILITY


Date

August 11, 1986


No.

18-42-86

P-2873
NOTE: THE FUEL FOAMING PACKAGE FROM TECHNICAL SERVICE BULLETIN 18-05-86 OR 18-06-86 MUST BE INSTALLED BEFORE PERFORMING THIS PROCEDURE


SYMPTOM/CONDITION

Under adverse conditions (such as high altitude and/or poor quality fuel), fuel foaming may occur on a front wheel drive vehicle even after the fuel foaming package has been installed. A new carburetor has been developed to reduce this condition.

Fuel Foaming - engine sags and/or exhibits poor performance following a hot soak restart. This condition occurs when cool incoming fuel meets the hot fuel in the carburetor fuel bowl, which creates an over rich condition. Engine will restart (unloading technique may be necessary).

DIAGNOSIS

Engine must be fully warmed up (fuel foaming does not affect cold engine driveability). The following are characteristics of fuel foaming:

^ Occurs primarily after hot soak restart or prolonged idle only on medium to heavy acceleration.
^ Sag is due to rich fuel mixture.
^ Black smoke at tailpipe.
^ Fuel pressure is normal.
^ Raw fuel at carburetor air horn.
^ Good accelerator pump discharge.
^ Will immediately start (unloading technique may be necessary).
PARTS REQUIRED

1984 Front Wheel Drive Vehicles

1 Carburetor Assembly *PN MD997300
(carburetor PN MD113447)

1985 Front Wheel Drive Vehicles

1 Carburetor Assembly *PN MD997301
(carburetor PN MD113448)

*These carburetor assemblies include a carburetor and base gasket, PN MD025344.

1 Authorized Modification Label PN 4275086

REPAIR PROCEDURE

This repair involves replacing the carburetor with a revised carburetor.

1. Replace the carburetor per the appropriate service manual procedure.

FIGURE 1:

2. Type information on the Authorized Modification Label, PN 4275086, as shown in Figure 1.

3. Apply Authorized Modification Label, PN 4275086, near the existing VECI label.
POLICY: Reimbursable within the provisions of the warranty


TIME ALLOWANCE:
Labor Operation No. 14-70-17-96 0.7 Hrs.


FAILURE CODE: AM - Authorized Modification