LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1979 >> Prelude Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Throttle Control System >> Testing >> Throttle Opener System >> 1976 Models
April 5, 2026: LEMON Manuals is launched! Read the announcement.

1976 Models

  1. Perform DASHPOT SYSTEM test. By-pass the speed sensor by applying battery voltage to Yellow/Black wire at emission control box connector.
  2. Squeeze vacuum hose shut between dashpot solenoid valve and carburetor. Raise engine speed to 3500 RPM and release throttle. Engine should return to idle in 2-8 seconds. If return time is out of limits, remove throttle control valve cover.
  3. Loosen lock nut on valve and turn adjusting nut clockwise to decrease return time or counterclockwise to increase return time. Tighten lock nut and retest. If return time cannot be increased, measure voltage at throttle positioner solenoid.
  4. If voltage (12 volts) exists, replace either throttle positioner solenoid or throttle control valve. To test throttle control valve, remove vacuum hose and check for vacuum. If vacuum exists, throttle control valve is defective.
scientia non olet · About LEMON Manuals