1977-79 Models
- Connect tachometer to engine. Start engine and allow to reach normal operating temperature (cooling fan comes on). Check throttle opener by disconnecting hose from throttle opener diaphragm and connecting a hand-held vacuum pump.
- With engine running, apply at least 16 in. Hg of vacuum for more than one minute. Check that engine speed rises to RPM shown in THROTTLE OPENER SPECIFICATIONS table.
- If speed is too low, widen adjustment slot in throttle control linkage. See Fig 1. If speed is too high, narrow slot opening. If speed cannot be adjusted, or diaphragm will not hold vacuum, replace diaphragm and repeat test.
- Reconnect vacuum hose. Raise engine speed to 3500 RPM and maintain for 2-3 seconds. Quickly release throttle. Engine should return to idle in 1-4 seconds. If not, see TROUBLE SHOOTING in this article.THROTTLE OPENER SPECIFICATIONS
Application RPM 1976 2500-3500 1977-78 Man. Trans. 2700 Auto. Trans. 2200 1979 Civic CVCC Man. Trans. (1) 1700-2700 Auto. Trans. 1500-2500 Accord & Prelude 2000-3000 (1) Set to 2200-3200 RPM on models with throttle control valve.