Caravelle L4-156 2.6L SOHC (1985)
Carburetor: Customer Interest
Carburetor - Sags/Hesitation On Hot Restart
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.
