Secondary vacuum question

[MrsMcNastys]

When checking the secondary vacuum pump and line going under the plenum for a vacuum leak, does that same line going to the plenum pull vacuum at idle ?...

i.e. at idle if disconnected the line has engine manifold vacuum, wondering if this indicates a bad reservoir or check valve? Or is that normal?

Ed

[MrsMcNastys]

Sorry, line fitting disconnected near the oil cooler where you check pump vacuum and plenum line for leak-down.

I am guessing that the pump and vacuum reservoir is for the secondaries at WOT when manifold vacuum drops as just a reservoir by itself would be quickly depleted during a WOT run to top speed, I was just surprised that the manifold vacuum is not isolated from the pump ...

Ed

[Daniel_Mc]

Dynomite,

Thanks for posting that pic I am having an issue with the secondary system and was looking fro just that pic to make sure it was run correctly.

Daniel

[scottfab]

Here is the manual schematic diagram of the vacuum system.
It clearly shows that you would feel vacuum at that point (when disconnected from the pump.

http://zr1.net/forum/album.php?albumid=189&pictureid=1351

When the engine is running this vacuum will shut off the air pump if everything is running properly.
http://zr1.net/forum/album.php?albumid=189&pictureid=1351

[Z51JEFF]

When checking the secondary vacuum pump and line going under the plenum for a vacuum leak, does that same line going to the plenum pull vacuum at idle ?...

i.e. at idle if disconnected the line has engine manifold vacuum, wondering if this indicates a bad reservoir or check valve? Or is that normal?

Ed

Mine does pull a small amount of vacuum when disconnected from the pump,hope its normal.:confused: