On Vehicle Inspection

- Check that the throttle linkage moves smoothly.
- Check the vacuum at each port.
- Start the engine.

- Check the vacuum with your finger.
2. INSPECT THROTTLE POSITION SENSOR.

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

- Using an ohmmeter, measure the resistance between each terminal.
- Reconnect the throttle position sensor connector.
- Reconnect the throttle opener vacuum hose to the throttle body.
3. INSPECT AND ADJUST DASHPOT.
- Warm up engine
- Allow the engine to warm up to normal operating temperature.
- Check idle speed

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

- 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 screwdriver.
- 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.
- 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.
4. INSPECT THROTTLE OPENER.
- Warm up engine
- Allow the engine to warm up to normal operating temperature.
- Check idle speed

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

- 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: 1,600 ± 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.