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Carburetor Choke System Test

NOTE: Engine MUST be dead cold before starting this test.
  1. Set accelerator linkage to proper start position. Remove air cleaner. Check choke plate and fast idle cam position.
  2. Choke plate should be in fully closed position and fast idle screw should be on highest step of fast idle cam. If choke and cam position are okay, go to step 3). If choke is not fully closed or cam is not in position, check for choke plate sticking or binding. Repair choke and linkage as required.
  3. Remove air cleaner. Set fast idle speed screw on highest step of fast idle cam. Remove vacuum line from choke diaphragm. Connect auxiliary vacuum supply to choke diaphragm. Apply 15 in. Hg of vacuum. Measure clearance between top of choke plate and air horn wall.
  4. Vacuum should hold at applied setting and choke plate should be in proper position of vacuum kick specifications. If vacuum holds and choke vacuum kick is within specifications, go to HEATED AIR INTAKE SYSTEM TEST  . If vacuum does not hold, replace choke vacuum kick diaphragm.
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