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Deceleration Control System: Testing

  1. With engine temperature below 104°F (40°C), disconnect the top wire from the thermocontact. Start engine and accelerate to 1800 RPM or more.
  2. Quickly release throttle. If operation of deceleration valve can be heard, system is good. Reconnect wire.
  3. If deceleration valve could not be heard, disconnect deceleration valve connector. Connect test lamp to terminals of connector.
  4. Again accelerate to 1800 RPM or more and quickly release throttle. If test lamp comes on then goes off, check vacuum hose routing. If connections are good, replace deceleration valve.
  5. If test lamp does not come on, check electrical connections, 2-speed relay and adjustment of microswitch. See ADJUSTMENTS  . If all are okay, replace deceleration relay.
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