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Home >> Ford >> 1984 >> Bronco II Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Deceleration Control System >> Testing >> System Quick Check

System Quick Check

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  1. With engine at idle, accelerate to 2000 RPM or more, then let it return to idle. Manifold vacuum should exceed 20.6 in. Hg since system includes a vacuum solenoid valve.
  2. If vacuum diaphragm plunger extends and retracts, system is functioning properly. If not, continue with tests in sequence given.
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