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Home >> Oldsmobile >> 1976 >> Custom Cruiser >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> ROCHESTER M4MC & M4ME 4-Barrel >> Adjustments >> Choke Unloader

Choke Unloader

NOTE: This adjustment is performed using choke valve angle gauge. See CHOKE VALVE ANGLE GAUGE  in this article.
  1. Adjust automatic choke. Hold throttle valves wide open. See  Fig 1 .  If engine is warm, close choke valve by pushing up on vacuum break lever tang. Hold in position with a rubber band.
  2. Bubble on choke valve angle gauge should be centered with specified degree mark opposite pointer. If angle gauge is not available, measure specified clearance between upper edge of choke valve and air horn wall.
  3. To adjust, bend choke unloader tang on throttle lever until bubble is centered or correct clearance is obtained.
    Fig 1: Adjusting Choke Unloader
    G09320072Courtesy of GENERAL MOTORS COMPANY