Component Inspection
INSPECTION1. Clean throttle body.
- Using a soft brush and carburetor cleaner, clean the cast parts.
- Using compressed air, clean all the passages and apertures.
NOTE: To prevent deterioration, do not clean the Throttle Position Sensor.
2. Inspect throttle valve.
- Apply vacuum to the Throttle Opener.
- Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.
3. Inspect Throttle Position Sensor.
- Apply vacuum to the Throttle Opener.
- Insert a thickness gauge between the throttle stop screw and stop lever.
- Using an ohmmeter measure the resistance between each terminal.
Clearance between Between Resistance
lever and stop screw terminals
0 mm (0 in) VTA - E2 0.28 - 6.4 k ohms
0.35 mm (0.014 in) IDL - E2 0.5 k ohms or less
0.70 mm (0.028 in) IDL - E2 Infinity
Wide open throttle VTA - E2 2.0 - 11.6 k ohms
Always VC - E2 2.7 - 7.7 k ohms
4. If necessary, adjust Throttle Position Sensor.
- Loosen the 2 set screws of the sensor.
- Apply vacuum to the Throttle Opener.
- Insert a 0.54 mm (0.021 in.) thickness gauge. between the throttle stop screw and stop lever.
- Connect the test probe of an ohmmeter to the terminals IDL and E2 of the sensor.
- Gradually turn the sensor clockwise until the ohmmeter deflects. and secure the sensor with the 2 set screws.
- Recheck the continuity between terminals IDL and E2.
With 0.35 mm (0.14 in) clearance between lever and stop screw you should measure continuity.
With 0.70 mm (0.28 in) clearance between lever and stop screw you should measure NO continuity.