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1975 Models

  1. With tachometer connected to engine, increase engine speed to 2500 RPM. Release accelerator and observe tachometer and dashpot plunger movement as carburetor returns to idle. Above 1650-1850 RPM, plunger must contact throttle linkage. Below 1550-1750 RPM, plunger must retract and free throttle linkage.
  2. If system does not perform as indicated, check dashpot adjustment and for vacuum at dashpot. If vacuum is present and dashpot does not operate, replace dashpot.
  3. Also check connector and ground at speed sensor. If okay, unplug connector from vacuum solenoid valve. Probe connector terminal with test light. If test light comes on with engine speed above 1900 RPM, vacuum solenoid valve is defective. If test light does not come on, wiring or speed sensor is defective.
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