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Engine bay ingition control unit vacume hose? 200

posted by  transit wind on  Wed Sep 5 13:15 CST 2007
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last visit: Fri Aug 15 22:40 CST 2014
[RELATED]

On another thread today I read:

"The box labeled with the blue Volvo sticker is the ignition control unit. Don't unplug the electrical connection unless absolutely necessary. Also, BrickBoard wisdom suggests removing the vacuum hose and plugging the holes."

What is the reason for plugging the vacume hose. What purpose does that vacume hose serve? I recently found one of mine not hooked up but when I connected it to the intake manifold the idle went up. Wondering should I just plug it?






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