FAST IDLE CAM POSITION ADJUSTMENT
- NOTE: If fast idle cam position adjustment is changed, choke unloader and secondary throttle lockout adjustments must also be reset
- Place fast idle speed screw on second highest step of fast idle cam against shoulder of high step
- Apply light pressure on fast idle control lever ot move choke valve towards closed position
- Insert correct gauge (.100") between bottom of choke valve and air horn wall at throttle lever side
- NOTE: Use care not to change choke position during measurement
- If adjustment is needed, bend fast idle connector rod at curved angle until correct gap is obtained
IDLE ENRICHMENT VALVE TEST
- Start engine and warm to normal operating temperature
- Turn engine OFF and remove air cleaner
- Install jumper wire from carburetor idle stop switch to ground
- Connect tachometer to engine
- Disconnect hose to idle enrichment system diaphragm at plastic connector
- NOTE: remove connector from carburetor hose before proceeding
- Start engine
- Place fast idle speed screw on setting (slowest speed) step of fast idle cam
- Attach outside vacuum source to enrichment diaphragm with 3 or 4 feet of hose
- Apply at least 15" Hg and note any engine RPM change
- If speed can be controlled by vacuum, system is working properly
- If not, block inlet air passage and note engine RPM change. If speed can be controlled in this manner, diaphragm is leaking and/or air valve is stuck open
- If speed cannot be controlled, air valve is stuck closed
- Clean air valve, apply 15" Hg vacuum, check if speed is controlled
- If speed cannot be controlled, replace the enrichment diaphragm
