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Deceleration Valve

If required time for engine to decelerate from 3000 RPM to idle is more than 7-8 seconds, deceleration valve adjusting screw should be turned clockwise. If required time is less than 7-8 seconds, adjusting screw should be turned counterclockwise until desired time is reached.

Fig 1: SAAB DECELERATION VALVE

Courtesy of SAAB-SCANIA OF AMERICA, INC.