2.Erratic Idle Warm Engine, or Engine May Stall During Coast Down, Just Before A Complete Stop.
2.1 THROTTLE VALVEThrottle control and throttle valve switch adjustment. (Reference, Service Manual TP 30427/1)
REMOVE LINK ROD FROM THROTTLE CONTROL PULLEY
LOOSEN THROTTLE CONTROL SWITCH
Loosen Screw (inhex 3 mm)
Turn switch clockwise
ADJUST THROTTLE VALVE
Loosen adjustment screw lock nut (8 mm wrench) Loosen adjustment screw until throttle valve completely closes. Tighten screw until it just touches throttle valve lever. Tighten screw additionally 1/4 turn. Tighten lock nut.
Check that throttle valve moves easily and does not bind.
ADJUST THROTTLE VALVE SWITCH
Turn switch counter-clockwise to stop, but not so far that throttle valve begins to move.
Tighten screws, Check adjustment. A "click" (idle switch opens) should be heard immediately when throttle valve moves.
CHECK THROTTLE CONTROL PULLEY ADJUST THROTTLE CABLE
Pulley should move easily without binding.
Cable should be stretched but should not influence pulley position. Pulley should touch idle stop.
Depress accelerator pedal to floor and check that throttle control pulley touches full throttle stop.
CHECK/ADJUST KICK-DOWN CABLE (AUTOMATIC TRANSMISSION)
Depress accelerator pedal to floor.
CAUTION: Do not operate throttle control by hand as incorrect adjustment can result.
At full throttle distance from cable sheath to clip should be 50.4 - 52.6 mm (2" - 2-1/16").
CONNECT AND ADJUST LINK ROD
Position a 1 mm (0.04") thick feeler gauge between throttle control pulley and idle stop.
Adjust link rod so clearance between throttle valve lever and adjustment screw is 0.1 mm (0.004").
2.2 IDLE ADJUSTMENTS
Check/adjust ignition timing, CO-content and basic idle speed.
Seal CO-adjustment (if adjustment performed).
NOTE! The basic idle speed should be adjusted to 700-750 rpm with the idle speed test point grounded. Refer to Service Manual TP 30427/1
2.3 AIR VALVE
Check the function of the air valve, by grounding the idle speed test point, (blue-white wire) located in front of the left strut tower. If the variations in idle speed disappear, test with a new air valve.