Boost Controlled Deceleration Device
- With engine at normal operating temperature, manual transmission in "N" or automatic transmission in "D", connect vacuum gauge and tachometer to engine. Increase engine speed to 3000-3500 RPM and quickly release throttle. At this moment manifold vacuum should read above 21.7" (550 mm) Hg and gradually fall to about 16.5" (420 mm) Hg at idle. This change in vacuum should take about four or five seconds.
- If device is set to actuate at vacuum which is higher than desired level, the delay in returning to idle will be less than the specified 4-5 seconds. If device is set to actuate at vacuum which is lower than the desired level, the delay will be more than the specified 4-5 seconds.
- Set device to operate at 19.7 ±.787" (500 ± 20 mm) Hg (Man. Trans.) or 18.9 ±.787" (480 ± 20 mm) Hg (Auto. Trans.) by turning adjusting screw.NOTE: Turning adjusting screw 1/8 turn in either direction will cause a change of.79 in. Hg of vacuum needed to operate device. Turn screw clockwise to decrease vacuum required (increasing delay) or counterclockwise to increase vacuum required (decreasing delay).