Civic CVCC L4-1488cc 1500 EM1 (1982)
Fig,30 - Evaporative Emission Control System
2. If there is no vacuum at idle once engine is warm, check thermovalve "B" by pinching the hose to air filter. If vacuum is now available to canister,
replace thermovalve "B". If not, check hoses #7 and #19, Figs. 29 & 30, for blockage or leaks. If there is no vacuum at idle, disconnect vacuum
gauge and reconnect hose.