On Vehicle Inspection

THROTTLE BODY:





1. Check that the throttle linkage moves smoothly.








2. Check the vacuum at each port.
- Start the engine.
- Check the vacuum with your finger.

THROTTLE POSITION SENSOR:





1. Disconnect the throttle position sensor connector.
2. Disconnect the throttle opener vacuum hose from the throttle body.
3. Apply vacuum to the throttle opener.
4. Insert a feeler gauge between the throttle stop screw and stop lever.








5. Using an ohmmeter, measure the resistance between each terminal.
6. Reconnect the throttle position sensor connector.
7. Reconnect the throttle opener vacuum hose to the throttle body.

DASHPOT:

1. WARM UP ENGINE.
- Allow the engine to warm up to normal operating temperature.





2. CHECK IDLE SPEED.

Idle speed (Transmission in neutral position): 700 ± 50 rpm




3. CHECK AND ADJUST DASHPOT SETTING SPEED.
- Disconnect the control cables from the throttle body.
- Push the dash pot push rod all the way with a screw- driver.
- Check that the dash pot is set.

Dash pot setting speed:
M/T: 2,600 ± 400 rpm
A/T: 1,800 ± 400 rpm

- Adjust the dash pot setting speed by turning the dashpot adjusting screw.
- Reconnect the control cables to the throttle body.





4. CHECK VTV OPERATION.
- Maintain the engine at 3,500 rpm.
- Release the throttle valve, and check that the engine returns to idle in a few seconds.

THROTTLE OPENER:

1. WARM UP ENGINE.
- Allow the engine to warm up to normal operating temperature.





2. CHECK IDLE SPEED.

Idle speed (Transmission in neutral position): 700 ± 50 rpm




3. CHECK THROTTLE OPENER SETTING SPEED.
- Disconnect the throttle opener vacuum hose from the throttle body. and plug the hose end.





- Maintain the engine speed at 2,500 rpm.
- Release the throttle valve.





- Check that the throttle opener is set.

Throttle opener setting speed: 1,500 ± 400 rpm

- If the throttle opener setting speed is not as specified, replace the throttle body.





- Reconnect the throttle opener vacuum hose to the throttle body.