Quote:
Originally Posted by robbz28
I tested the pump, I put my thumb over the inlet and it would turn off and stay off, as soon as I plug it back into the car it will run for 5-10 seconds then start to cycle on and off..it will run for maybe a second then stay off for 2 or 3, then on again....Definately a leak under the plenum. I got a mightyvac gauge yesterday and I can pump it up to 15 and it will slowly leak down to zero in about 3 to 4 seconds.
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Yah well that's not a slow leak you have. It's plenum pull time.
Sounds like check valve. Try applying the vacuum to the vacuum line
in the middle of the plenum on the driver's side. If the vacuum holds there (or leaks down from 15 to 10 in ten seconds or more) then it's likely the check valve or the fit of the hose on that metal tube you removed the line from.