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Stepper Motor
The step|>er motor used with feedback carburetors has
two tapered metering pins that interact with two air
cavities located inside the main body of the carburetor.
The air intake for the feedback air input is located
behind the main cluster inside the carburetor.
When the step|ier motor "steps" to the rich "rail,"
each metering pin is moved the maximum distance into
an air cavity.
When the stepper motors "steps" to the "lean" rail,
each metering pin is pulled the maximum distance out
of an air cavity.
Refer to Computerized Emission Control (CEC) Sys
tem for additional information.
n s -
LOW SPEED
CIRCUIT
H^/-
STEPPER MOTOR
ASSEMBLY
Metering Pins in Cavities (Rich)
LOW SPEED
CIRCUIT
STEPPER MOTOR
ASSEMBLY
L^^_
Metering Pins Out of Cavities(Lean)
FUEL SYSTEMS
1J-51
ox.
r®
&& ^
1.
DIAPHRAGM CONNECTOR LINK
21.
VENTURI CLUSTER SCREW
41.
MIXTURE SCREW
2. SCREW
22.
IDLE FUEL PICKUP TUBE
42.
SPRING
3. CHOKE VACUUM DIAPHRAGM
23. GASKET
43.
THROTTLE BODY
4.
HOSE
24. VENTURI CLUSTER
44.
CHOKE HOUSING
S. VALVE
25. GASKET
45. BAFFLE
6. METERING ROD
26.
CHECK BALL (SMALL)
46. GASKET
7.
SLINK
27. FLOAT
47.
RETAINER
8. PUMP ARM
28. FULCRUM PIN
48.
CHOKE COIL
9. GASKET
29.
BAFFLE
49. LEVER
10. ROLLOVER CHECK VALVE
30. CLIP
50.
CHOKE ROD
11. SCREW
31. CHOKE LINK
51.
CLIP
12. LOCK
32. SCREW
52.
NEEDLE AND SEAT ASSEMBLY
13. ROD LIFTER
33. FAST IDLE CAM
53. MAIN BODY
14. VACUUM PISTON
34.
GASKET
54.
MAIN METERING JET
15.
PISTON
35. THERMOSTATIC CHOKE SHAFT
55.
ACCELERATOR PUMP PLUNGER
16.
AIR HORN RETAINING SCREW (SHORT)
36. SPRING
56.
FULCRUM PIN RETAINER
17.
SOLENOID
37. SCREW
57. GASKET
18. STEPPER MOTOR
38. PUMP LINK
58. SPRING
19.
AIR HORN RETAINING SCREW (LONG)
39. CLIP
59. AIR HORN
20. PUMP LEVER
40. GASKET
60. LEVER
Rg. 1J-99 Parts Idsntiflcatloo—Carter Modal BBD Carburetor
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Troubleshooting
