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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
It should hold vacuum and not leak down, and it should open the connection to the 2 larger hose connections on the other side at around 21 inches of intake manifold vacuum which it will only see when decelerating with the throttle closed in a low compression 930.

Replacing it would be the easiest way to lower the popping back to what it was.
A new one is unbelievably expensive if you can find one but you should be able to find a used one cheaply with a wanted ad..

You should replace all those old dry rotted origonal fabric covered vacuum lines. The rubber hose underneath the fabric wrap cracks and then leaks and you can't see the dried rubber cracks with the fabric over it.
You can see it's the origonal weathered vacuum hose on the left vacuum solenoid that switches the left and right side air pump diverter valves if they are still there.
Old 08-14-2010, 10:46 AM
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