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It is possible that you have the pipe connected incorrectly. There are two vacuum take offs, one before the throttle butterfly and one after. The pipe should be on the one on the filter or intake side of the throttle valve. However on some models there are two pipes and the second goes on the other side of the vacuum advance unit that tries to keep the unit in the retarded position.

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18y ago
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Q: What can cause excessive manifold vacuum to the vacuum advance unit in a 1988 Nissan Pintara?
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