Mini Ram Van L4-156 2.6L SOHC VIN G 2-bbl (1984)
Vacuum Delay Valve: All Technical Service Bulletins
Carburetor - Sags/Poor Hot Start Performance
Models
1984, 1985 & Early 1986 Caravan, Voyager & Mini Ram Vans With 2.6L Engines/Federal Emissions
Subject
Fuel Foaming
Index
DRIVEABILITY
Date
August 18, 1986
No.
18-41-86
P-2926-C
NOTE:
THIS BULLETIN DOES NOT APPLY TO 1986 "S" BODY VEHICLES WITH CARBURETOR PN MD109526, WHICH ALREADY
HAS THE IMPROVEMENTS.
BEFORE PERFORMING THIS REPAIR PROCEDURE, INSURE THAT TECHNICAL SERVICE BULLETTNS 14-17-85, 18-14-85,
18-20-86, AND THE APPROPRIATE FUEL FOAMING KIT ARE INSTALLED AS APPLICABLE.
SYMPTOM/CONDITION
Fuel foaming may occur on Caravan, Voyager, and Mini Ram Vans even after the fuel foaming kit has been installed. A new carburetor has been
developed to reduce this condition where carburetor, PN MD109526, has not been installed.
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 start (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
Parts listed below will have to be ordered separately as required by application.
1
EGR Delay Valve
PN 4324017
1*
Carburetor/Gasket
PN MD997258
1**
VCOTVV (Vacuum Controlled
PN 4306058
Orificed Tank Vapor Valve)
1
Authorized Modification Label
PN 4275086
*
PN MD997258 includes a base basket, PN MD025434, and carburetor, PN MD109526, as a package.
**
PN 4306058, VCOTVV, is for 1984 models only, 1985 and 1986 models already
have this valve installed.
