Nissan 100NX N14 silhouetteN14

CARBURETOR - Dash Pot or F.I. (Fast Idle) Pot (Cont'd) / Throttle Valve Switch (Models with catalyzer)

EF & EC-174prose procedure

M/T vs A/T idle speed specs differ (750 ± 50 vs 850 ± 50 in "N"). Models with vs without catalyzer differ in idle CO% and throttle valve switch procedure applies only to models with catalyzer.

Continued from EF & EC-173

Dash Pot or F.I. (Fast Idle) Pot (Cont'd)

F.I. ACTUATOR

  1. 1
    Warm up engine sufficiently.
  2. 2
    Check idle speed and mixture ratio.
    Idle speed: rpm (in "N" position) M/T 750 ± 50; A/T 850 ± 50
    Idle "CO": 1.5 ± 0.5% (Models without catalyzer); 1.0 ± 0.5%* (Models with catalyzer)
    * Disconnect exhaust gas sensor harness connector and A.I.V. control solenoid valve connector.
    Illustration of the F.I. pot on an automatic transaxle model carburetor. Callouts point to the 'Adjusting screw' (top) and 'F.I. pot' (right side).
    SEF915H
  3. 3
    Turn air conditioner switch "ON", and check idle speed.
    Idle speed: rpm (in "N" position) M/T 850 ± 50; A/T 850 ± 50
  4. 4
    If out of specification, adjust idle speed by turning adjusting screw.
Idle speed (in "N" position), M/TCheck idle speed and mixture ratio
750 ± 50rpm
Idle speed (in "N" position), A/TCheck idle speed and mixture ratio
850 ± 50rpm
Idle "CO" (Models without catalyzer)
1.5 ± 0.5%
Idle "CO" (Models with catalyzer)Disconnect exhaust gas sensor harness connector and A.I.V. control solenoid valve connector
1.0 ± 0.5%
Idle speed with A/C ON (in "N" position), M/TAir conditioner switch "ON"
850 ± 50rpm
Idle speed with A/C ON (in "N" position), A/TAir conditioner switch "ON"
850 ± 50rpm

Throttle Valve Switch (Models with catalyzer)

  1. 1
    Turn off engine and disconnect harness connector on carburetor.
    Harness connector pair shown disconnected, labeled 'Carburetor side' (left) and 'Vehicle side' (right), with arrows pointing down to a representation of the connector terminals/ohmmeter test setup.
    SEF444K
  2. 2
    Connect proper wires between the fuel cut solenoid valve harness terminals.
  3. 3
    Verify that continuity does not exist between the throttle valve switch harness terminals.
    Connector diagram with an ohmmeter (Ω symbol) connected to test continuity at the throttle valve switch harness terminals, with an arrow indicating the connection point.
    SEF445K
  4. 4
    Start engine and increase engine speed to about 2,000 rpm.
  5. 5
    At this time, verify that continuity exists between the throttle valve harness terminals.
  6. 6
    Then, decrease engine speed gradually to below. Engine speed: 1,200 rpm. At that point, the circuit should break and cause the ohmmeter to indicate an open circuit. If incorrect, adjust by bending plate until the ohmmeter indicates an open circuit.
    Engine speed: 1,200 rpm
    Carburetor illustration with callout to the 'Throttle valve switch' (top) and an arrow labeled 'Bend this portion' (bottom) indicating the adjustment plate.
    SEF446K
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