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Choke Rod (Fast Idle Cam)

NOTE: On all carburetors except 1959 and Later Oldsmobile and Olds F-85, the choke rod connects choke valve shaft to fast idle cam. On 1959 and Later Oldsmobile models, the rod connects intermediate choke lever to fast idle cam.

Rotate choke valve and fast idle cam until fast idle screw (cars with separate fast idle screw), slow idle screw (cars without separate fast idle screw) contacts SECOND step of fast idle cam and is against shoulder of highest step. On 1959 and later Oldsmobile models, raise intermediate choke lever to full up position making sure that intermediate rod and choke rod are at upper limits of travel in slots and that all lash is removed. On all models, bend choke rod to obtain specified clearance between choke valve and dividing wall of air horn. See " Specifications  ". 

Fig 1: CHOKE ROD ADJUSTMENT (TYPICAL) (EXCEPT OLDSMOBILE)
G09353188Courtesy of GENERAL MOTORS COMPANY
Fig 2: CHOKE ROD ADJUSTMENT (OLDSMOBILE)
G09353189Courtesy of GENERAL MOTORS COMPANY
Fig 3: CHOKE VACUUM DIAPHRAGM ADJUSTMENT (1964 OLDSMOBILE 330" ENGINE)
G09353190Courtesy of GENERAL MOTORS COMPANY