1967 Models: Tempest

230" 6 Cyl.
	(No A.I.R.)	4MV	7027261	7027260
	(With A.I.R.)	4MV	7037261	7037260
(1) "Climatic Combustion Control" option. See DESCRIPTION .

CHANGES, CAUTIONS, CORRECTIONS 

• "A.I.R." CARBURETOR NOTE:  These carburetors are used on engines with Air Injection Reactor exhaust emission control system and are special units with different jet calibrations and specifications.
• 1966 BUICK FUEL SYSTEM LEAK-DOWN TESTING CAUTION (Cars with Rochester 4MC Carbs.):  If test indicates excessive leak-down in carburetor, disassemble carburetor and check for leakage at inlet needle seat diaphragm assembly.
• 1966 BUICK ROUGH IDLE & POOR PERFORMANCE CORRECTION (All Cars with Rochester 4MC Carbs.):  Terne-coated steel plate must be installed between carburetor aluminum throttle body and mounting gasket on intake manifold to seal off exhaust gas in manifold exhaust gas channel (omission of plate will allow exhaust gas to foul up choke housing, leak into intake manifold and blow out through vacuum advance and crankcase vent lines). When correcting above complaint, make certain plate is installed (plate and gasket can be observed where they project at front corners of carburetor).
• 1966 BUICK ROCHESTER 4MC CARBURETOR LOOSE THROTTLE LEVER CORRECTION:  If this condition found on early carburetors, correct by installing new Throttle Lever Screw Kit, No. 1396859, as follows: Remove and discard old throttle lever retaining screw, assemble nut on new screw with lockwasher away from screw head, install this assembly on throttle lever, torque screw to 15 In. lbs., then torque locknut to 20 In. lbs.
  NOTE: On later carburetors, screw threads projecting through lever are peened or riveted to prevent screw loosening and no correction required on these carburetors.
• 1966 BUICK HARD STARTING & LACK OF POWER WITH WARM ENGINE (Cars with Rochester 4MC Carbs.):  May be caused by bent secondary air valve lockout tang resulting in upper offset end of choke rod becoming jammed over the tang (prevents choke closing and secondary air valve opening). Correct by repositioning choke rod offset under the lockout tang, then move choke rod and lockout tang sideways away from each other to remove all slack and bend lockout tang so that it is flush with end of choke rod. Check air valve lockout adjustment (see ADJUSTMENTS ).
• 1966 BUICK STALLING AFTER STARTING CORRECTION (All Models):  Make certain correct starting technique used (push accelerator pedal to floor once only to allow choke to close and position fast idle cam, do not tap throttle again until engine begins to pick up speed, then tap throttle to position fast idle cam on warm-up step to prevent excessive speed during prolonged warm-up). Check following adjustments: Fast Idle Speed, Fast Idle Cam Position, Vacuum Break Setting (change setting as indicated in Specifications), and Automatic Choke Setting.
  NOTE: For repeated complaints, choke may be set not more than 2 Notches Richer than specified setting (richer setting may result in car not starting in extreme cold weather due to overchoking).
• CADILLAC CARBURETOR INSTALLATION CAUTION: Stainless steel shim must be installed between manifold gasket and carburetor with side marked "top" upward. Carburetor will not idle if this shim omitted. 
• 1966 CHEVY II, CHEVELLE, CHEVROLET & CORVETTE HARD COLD STARTING & STALLING AFTER START CORRECTION:  Make certain correct starting technique used (depress accelerator to floor once only to allow choke to close and position fast idle cam, do not hold throttle open or pump throttle for a cold start). Change Vacuum Break Setting as follows:160" (7026202 & 7036202).200" (7026203 & 7036202).
  NOTE: This supersedes previous setting of.230" on these carburetors.
• 1967 OLDSMOBILE V8 HOT ROUGH IDLE CORRECTION (Rochester 4MV Carbs. with Day Stamp between 250 and 285):  If hot rough idle occurs with carburetors with day stamp between 250 and 285 (stamped on left rear corner of throttle body) and without Black Stripe on idle Compensator cover, correct this condition by replacing idle compensator. Correct idle compensator will have pointed valve (incorrect valve has dished center).
• 1967 OLDSMOBILE V8 ROUGH OR RICH IDLE OR HARD HOT STARTING CORRECTION (Rochester 4MV Carbs. with carburetor tag letter "H" or "J"):  May be caused by plugged left or right idle air bleed. If gasoline fumes are evident or gasoline seepage is noted at ends of primary throttle shaft after engine has been shut off for short time, idle bleeds are probably plugged. To check for this condition, remove air horn and check air bleeds with.042" (1/32") drill. See Figure for air bleed locations.
• 1966 PONT/AC TEMPEST CARBURETOR LOADING DURING WARM-UP CORRECTION (Sprint Models with Rochester 4MV Carbs.):  Correct by replacing Choke Thermostatic Spring assembly with new type: Part No. 7036190 (Synchro-mesh), 7036191 (Auto. Trans.).