On Vehicle Inspection

ON-VEHICLE INSPECTION





1. INSPECT THROTTLE BODY
(a) Remove the V-bank cover.
(b) Check that the throttle linkage moves smoothly.





(c) Check the vacuum at port P.
- Disconnect the vacuum hose and plug port P with your finger.
- Start the engine and check the vacuum with your finger.
2. INSPECT AND ADJUST DASHPOT
A. Warm up engine
Allow the engine to warm up to normal operating temperature.
B. Check idle speed

Idle speed: 650 ± 50 rpm





C. Remove cap, filter and separator from dash pot
D. Check and adjust dash pot setting speed
(a) Maintain the engine at 4,000 rpm.





(b) Plug the VTV hole with your finger.
(c) Release the throttle valve.
(d) Check that the dashpot is set.

Dash pot setting speed: 2,500 rpm





(e) Adjust the dash pot setting speed by turning the dashpot adjusting screw.
(f) Repeat steps from (a) to (c) and recheck the dash pot setting speed.
E. Reinstall separator, filter and cap to dash pot.

HINT: Install the filter with the coarser surface facing the atmospheric side (outside).

F. Check VTV operation
(a) Maintain the engine at 2,500 rpm.
(b) Release the throttle valve and check that the engine returns to idle in a few seconds.





3. CHECK THROTTLE OPENER
(a) Check the engine speed when disconnect the throttle opener vacuum hose.

Engine speed: 650 ± 50 rpm -> 1,200 ± 200 rpm





(b) If not at specified speed, adjust with the throttle opener adjusting screw.
(c) Reinstall the vacuum hose to the throttle opener.