B350 1 Ton Van V8-360 5.9L VIN W (1985)
Bowl Vent: Customer Interest
Fuel System - Hard Starting/Long Crank Times
Models
1985 360 4BBL Heavy Duty Trucks "D", "W" & "B" Models
Subject
Hard Hot Starts, Poor Fuel Economy
Index
DRIVEABILITY
Date
April 28, 1986
No.
18-26-86
P-1537C
SYMPTOM/CONDITION
Poor fuel economy, long crank times, and black smoke coming from the exhaust when starting a cool (not cold) engine. This symptom will be more
pronounced when the ambient temperature is below 60~ F.
This hard start condition is caused by the choke closing while the engine is still hot. This causes the engine to run rich.
PARTS REQUIRED
Driveability Package PN 4397709
Consists of:
2
Bolts, Pressure Tap Adapter
PN 6500499
1
Bowl Vent Valve
PN 5214336
1
Pressure Tap Adapter
PN 4241252
1
Wire Assembly
PN 4362459
1
Bolt, 6 mm x 14 mm - 1.0
PN 5240437
1
Nut, 6 mm x 1
PN 6100516
1
Tie Strap
PN 6015756
To be ordered separately:
1
Authorized Modification Label
PN 4275086
1
3/8" Hose
PN 4203421
1
3/16" Hose
PN 4105167
REPAIR PROCEDURE
This
bulletin authorizes changes in the bowl vent, the vapor
containment door located in the air cleaner housing, and a jumper wire to bypass the choke control switch.
To receive the greatest benefit of this drive package, it will be necessary to also install the heater hose reroute package as described in Technical Service
Bulletin #18-19-86.
STEP A - ELIMINATING CHOKE CONTROL SWITCH
1.
Remove the electrical leads from the choke control switch.
2.
Install the switch jumper wire, PN 4362459, supplied to the electrical leads removed from choke control switch.
STEP B - DISABLING THE AIR CLEANER VAPOR CONTAINMENT TRAP DOOR
