Procedure A (Without Letter on Idle Air Bleed Valve)

Installing Idle Air Bleed Valve Gauging Tool.:

Positioning Idle Air Bleed Valve:

Procedure A (No Letter on Idle Air Bleed Valve)

1. PRESETTING THE IDLE AIR BLEED VALVE to a gage dimension is necessary if the idle air bleed valve was serviced prior to on-vehicle adjustment.

a. Install idle air bleed valve gaging Tool JD-33815-2, BT-8253-B, or equivalent, in throttle side "D" shaped vent hole in the air horn casting. The upper end of the tool should be positioned over the open cavity next to the idle air bleed valve.
b. While holding the gaging tool down lightly, so that the solenoid plunger is against the solenoid stop, adjust the idle air bleed valve so that the gaging tool will pivot over and just contact the top of the valve. The valve is now preset for on-vehicle adjustment.
c. Remove gaging tool and proceed to step 2 below.

2. ADJUSTING THE IDLE AIR BLEED VALVE (PROCEDURE A)

a. To obtain correct dwell reading on vehicle, start engine and allow it to reach normal operating temperature.
b. While idling in Drive (Neutral for manual transmission), use a screwdriver to slowly turn valve counterclockwise or clockwise, until the dwell reading varies within the 25-35~ range, attempting to be as close to 30~ as possible. Perform this step carefully. The air bleed valve is very sensitive and should be turned in 1/8 turn increments only.
c. If, after performing Steps a and b above, the dwell reading does not vary and is not within the 25-35~ range, it will be necessary to remove the "concealment plugs and to adjust the idle mixture needles". SEE CONCEALMENT PLUG REMOVAL & IDLE NEEDLE ADJUSTMENT PROCEDURE A.