Off-Vehicle Inspection

INSPECTION OF THROTTLE BODY (REMOVED)
1. CLEAN THROTTLE BODY BEFORE INSPECTION
(a) Wash and clean the cast parts with a soft brush in carburetor cleaner.

(b) Using compressed air, blow all passages and apertures in the throttle body.

CAUTION: To prevent deterioration, do not clean the throttle position sensor.

2. CHECK THROTTLE VALVE
(a) Check that there is no clearance between the throttle stop screw and throttle lever when the throttle valve is fully closed.

(b) When the throttle valve is fully closed, check that advancer port is located on the air cleaner side as shown in the image.

If not, adjust the throttle valve closing angle.

NOTE: Do not adjust the throttle valve closing angle if unnecessary.

3. IF NECESSARY, ADJUST THROTTLE STOP SCREW
(a) After loosening the lock nut of the throttle stop screw, loosen the stop screw until it is about to touch at the lever.
(b) Have the throttle stopper screw touch the lever. Then screw it in 1/4 turns and lock it with the lock nut.
(c) After installation of the throttle body, make sure that engine rpm does not change even if the vacuum hose to the vacuum advance port is pinched.

4. CHECK THROTTLE POSITION SENSOR

5. IF NECESSARY, ADJUST THROTTLE POSITION SENSOR
(a) Loosen the two screws of the sensor.

(b) Insert a thickness gauge (0.70 mm or 0.028 in.) between the throttle stop screw and lever, and connect the ohmmeter to terminals IDL and E2.

Gradually turn the sensor clockwise until the ohmmeter deflects, and secure the sensor with two screws.