Fuel System - Bbd Carburetor; Code Number/Build Date Identification; Model Bbd Carburetor Idle Speed; Model Bbd Carburetor Mixture Adjustment - Jeep 1987 Wrangler Workshop Manual

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ENGINES
FUEL SYSTEM - BBD CARBURETOR
GEiEiAL i i F O i l A T l O i
The 4.2 liter (258 CID) six-cylinder engine is
e q u i p p e d w i t h a Model B B D t w o - v e n t u r i ,
feedback type carburetor.
The stepper motor included with this carburetor
has two tapered metering pins. Each metering
pin is moved in and out of the carburetor air
cavity to achieve the proper air/fuel ratio.
CODE NUMBER/BUILD DATE IDENTIFICATION
The carburetor is identified by a code number
and a build date stamped on the identification
tag.
E a c h c a r b u r e t o r b u i l d m o n t h is c o d e d
alphabetically beginning with the letter A in
J a n u a r y a n d e n d i n g w i t h the letter M in
December (the letter I is not used).
The tag is attached to the carburetor and must
remain with it to assure proper identification.
60430
SPECIFICATIONS
Model BBD Carburetor Idle Speed
Displace-
ment
and
Carbure-
tion
Curb Idle
Speed - R P M
(Auto in
Sole-Vac Adj u stment
Displace-
ment
and
Carbure-
tion
Trans.
Dri v e,
Manual in
Mtutrat)
Vacuum
Actuator
Energized
Hol d i n g
Sol e noi d
Energi z ed
Set
T o
O K
R a n g e
8«t
T o
O K
R a n g e
258 CID
M
§ 8 0
± 5 0
1100
900
- 5 0
2V
A
600
900
800
TSQ
90744
Model BBD Carburetor Mixture Adjustment
Displacement
and
Carburetion
Transmission Application
Idle Drop
258 CID
2V
Manual
All
50 rpm
258 CID
2V
Automatic
All
50 rpm
90745
R - 0 1 7

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