Publication #81-270-5001

TSB 14-04-87 May 4, 1987 Publication #81-270-5001
(3) Return to idle then reposition the adjusting screw on to the second highest step of the fast idle cam to verify fast idle speed. Readjust if necessary.
(4) Return to idle and turn the engine off. Unplug and reconnect the vacuum hoses at the EGR valve and canister.
(5) Reinstall the air cleaner and unplug and reconnect the vacuum hose from the carburetor to the heated air temperature sensor on the air cleaner. Remove the tachometer and reinstall the PCV valve. Idle speeds with the engine in normal operating condition (everything connected) may vary from set speeds. DO NOT READJUST.



11. CONCEALMENT PLUG REMOVAL
(1) Remove air cleaner.
(2) Disconnect all hoses from front of carburetor base.
(3) Center punch at a point 1/4 inch from end of mixture screw housing.
(4) Drill through at punch mark with 3/6 inch drill bit.
(5) Repeat operation on opposite side.
(6) Pry out plugs and save for reuse.
(7) Reinstall hoses and air cleaner.




BOWL VENT VALVE ADJUSTMENT 2280
(1) Remove bowl vent cover plate and vent valve lever spring. CAUTION: Do not dislodge or misplace vent valve lever retainer/pivot pin.
(2) With the throttle in the curb idle position, press firmly down on the vent valve lever where the spring seats; with another finger of the same hand, simultaneously press down on the vent valve tang until the vent valve is lightly seated(closed). CAUTION: If the carburetor is not on the engine, it must be on a raised fixture so as not to change the curb idle throttle plate position.
(3) Using the other hand, measure the resulting gap between the contact surfaces of the vent valve lever and the vent valve tang with an appropriate gauge.
(4) Adjust by bending the end of the vent valve lever up or down until the specified gap (.030") is set.
(5) Install vent valve lever spring and bowl vent cover plate.
NOTE: THE BOWL VENT VALVE ADJUSTMENT MUST, BE RESET IF THE ACCELERATOR PUMP ADJUSTMENT IS CHANGED.