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Home >> Mazda >> 1978 >> GLC Base, 4D Hatchback, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Deceleration Control System >> Testing >> Coasting Richer System >> 1975 Models & 1976-77 Federal 1600cc Man. Trans. Equipped Models (System Test)
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1975 Models & 1976-77 Federal 1600cc Man. Trans. Equipped Models (System Test)

  1. Start and run engine at idle. Unplug coasting richer valve connector. Connect coasting richer valve lead directly to positive battery terminal. Engine speed should increase to 1050-1300 RPM.
  2. Stop engine. Connect voltmeter to coasting richer valve connector terminals. Block front wheels, raise rear of vehicle, and support with safety stands. Start engine and accelerate to 15 MPH. No current should flow to terminals when accelerator pedal is released.
  3. Accelerate engine to 18-20 MPH and release accelerator pedal. Current should flow to terminals when accelerator pedal is released and stop flowing when vehicle speed decreases to 17-11 MPH.