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Home >> Peugeot >> 1980 >> 604 Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Deceleration System >> Adjustment >> Deceleration Valve

Deceleration Valve

  1. Connect tachometer, warm engine to normal operating temperature, and adjust idle speed to 900-950 RPM. Accelerate engine to 3000 RPM and release throttle. Speed should drop to 1500, pause for 2-3 seconds, then return to idle. If so, system is adjusted correctly.
  2. If deceleration system is not operating properly, adjust valve. Hold diaphragm sleeve with 10 mm wrench. Loosen locknut on adjusting rod with 13 mm wrench.
    CAUTION: If sleeve is not held stationary with 10 mm wrench, internal diaphragm will be damaged.
  3. Turn adjusting rod clockwise until speed rises to 1500-1550 RPM. Accelerate engine several time and ensure that speed remains at 1500 RPM. Turn adjusting rod counterclockwise until idle speed returns to 900-950 RPM. Accelerate engine several times and recheck idle speed.
  4. Accelerate engine to 3000 RPM and release throttle. Speed should pause 2-3 seconds at 1500 RPM, then return to idle. If so, turn adjusting rod counterclockwise 1/2 turn more and tighten locknut.
  5. If engine speed does not pause or return to idle, repeat adjustment procedure. If correct results cannot be obtained, replace valve and readjust.
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