Fast Idle Valve
NOTE:
The fast idle valve is factory set and should not be disassembled. Check PCV system tubing for breakage, disconnection and clogging. Ensure throttle valves are fully closed.
- If engine idle speed is too high after engine is warmed up, ensure that engine is adequately warmed up. Check whether idling control function is normal.
- To do so, remove fast idle valve cover. Ensure valve is completely closed. If not, air is being sucked from valve seat area. It can be detected by putting finger on the valve seat area. See Fig 1 .
- If any sucking is felt, valve is leaking. Replace fast idle valve and adjust idle speed. See ADJUSTMENTS .
- If idle speed is too low after engine is warmed up, remove idle adjusting screw. Wash idle adjusting screw and air by-pass channel with carburetor cleaner. Readjust idle speed.NOTE: If fast idle speed is low when engine coolant temperature is below 140°F (40°C), fast idle valve may be stuck closed. Fast idle speed should be 1250-2250 RPM.
- To check for fast idle speed being too low, remove fast idle valve assembly from throttle body. Apply cold water to cool down thermowax element within fast idle valve to 41-86°F (5-30°C).
- Blow through "Part A" of fast idle valve and check that a fairly large amount of air flows without resistance. See Fig 2 . If air does not flow or resistance is large, replace fast idle valve and adjust idle speed.