Engine Control; Idling Speed Inspection And Adjustment; Accelerator Control Cable Adjustment; Accelerator Pedal Adjustment - Isuzu 4JB1 Service Information

ENGINE CONTROL

Idling Speed Inspection
1. Set the vehicle parking brake and choke the drive
wheels.
2. Place the transmission in neutral.
3. Start the engine and allow it to warm up.
4. Disconnect the engine control cable from the control
lever.
5. Set a tachometer to the engine.
6. Check the engine idling speed.
If the engine idling speed is outside the specified
range, it must be adjusted.
Engine Idling Speed
4JB1 / 4JB1T / 4JB1TC
Idling Speed Adjustment
1. Loosen the idling set bolt lock nut on the injection
pump idling set bolt.
2. Adjust the idling speed to the specified range by
turning the idling set bolt.
3. Lock the idling set bolt with the idling set bolt lock nut.
4. Check that the idling control cable is tight (free of
slack).
If required, remove the slack from the cable.
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Accelerator Control Cable Adjustment

1. Loosen the accelerator cable clamp bolt.
2. Check that the idling control knob on the instrument
panel is in the engine idling position.
3. Hold the accelerator lever in the fully closed position
and stretch the control cable in the direction indicated
by the arrow to remove any slack.

Accelerator Pedal Adjustment

1. Loosen the lock nut.
2. Adjust bolt height from floor.
Adjust Bolt Height A
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SERVICE INFORMATION 00 – 45
4JG2
18 - 28 (0.71 - 1.1)
rpm
750 - 790
700 - 740
mm (in)