Vacuum Pull-Off Automatic Choke: Description

Vacuum Pull-Off Automatic Choke is used on 1974 345" and 392" V8 engines with automatic transmission in California only. Coolant temperature and transmission gear selection control opening of choke to provide more efficient choke operation to engine requirements, and reduce carbon monoxide (CO) during engine warm-up. It consists of vacuum pull-off diaphragm, solenoid vacuum valve, low temperature switch and transmission pressure switch. Pull-off choke will completely open choke valve (overriding bi-metal thermostatic spring) when coolant temperature exceeds 60°F and automatic transmission is in high gear.