How Much Secondary Leakage?

[Dynomite]

Originally Posted by 5ABI VT

I unplugged from the passenger side where the tube goes into the plenum and capped it : 1:55 seconds before my fingers got tired. Plugged in.. 6 seconds and on for about about 1.

Passenger side is HVAC and Cruise.....I am confused....is that one minute 55 seconds.....whatever you capped on the passenger side...that has nothing to do with the secondary vacuum system.

It sounds like you are saying when you turn the key on (engine off) your vacuum pump is on for 1 second and off for 6 seconds which means you have vacuum leaks but are still functional on secondaries.

It would require you to start at the pump vacuum lines and work rearward to and under the plenum checking to see where that vacuum leak is located. Just unplug connectors and hold finger over side of connection coming from the Vacuum Pump. If Vacuum Pump quits cycling, the leak is beyond that point. If Vacuum Pump continues to cycle, leak is between that point and the Vacuum Pump.

Originally Posted by fletchusmc

Will have to do some digging around now. Later the same day I was finally able to get into an open enough stretch of road to open her up, ran all the way up to 7k like usual. I've got the FSM so obvious I need to do some homework on this part.

I appears that both of you have functional Secondaries which you can very easily check with engine off and key on........

See Secondary Functional Test and Reconditioning the Secondary Actuators

[Hos327]

8 minutes!! Do I win something? Lol! 1990 with over 120000 on it. Had the plenum off for injectors and was going to tie open secondaries but thought if the system is that tight I?ll leave them active for now. Was shocked it was that tight as the car in not overly clean.

[Dynomite]

Originally Posted by Hos327

8 minutes!! Do I win something? Lol! 1990 with over 120000 on it. Had the plenum off for injectors and was going to tie open secondaries but thought if the system is that tight I?ll leave them active for now. Was shocked it was that tight as the car in not overly clean.

Your prize is a Functional Full Power Switch
I have several posts within my signature related to upgrading/replacing the original vacuum lines and rubber connectors (which have hardened and shrunk with age) under the plenum

I do these inexpensive replacements on all Zs as part of the Top End Restorations

[staminqia]

This is a great discussion as I have leak and my pump runs for 2 seconds and turns off for 2 second and then back on again. As of now I have no issue with secondary's. I find this odd but its the truth. I took it out for a 10 mile run with a ton of WOT and I had no codes or loss of power. What am I missing?

[ram_g]

Originally Posted by staminqia

...my pump runs for 2 seconds and turns off for 2 second ... I have no issue with secondary's. ... What am I missing?

You're not missing anything. According to Maestro Haibeck the secondaries will work fine even if the pump cycles off for only 1 second.

http://www.zr1specialist.com/HAT%20W...%20Working.pdf

[staminqia]

Originally Posted by ram_g

You're not missing anything. According to Maestro Haibeck the secondaries will work fine even if the pump cycles off for only 1 second.

http://www.zr1specialist.com/HAT%20W...%20Working.pdf

Yes agreed! Mine cycles off for about 2 seconds with no issues. I don't know if this question has come up yet but at how many seconds will secondary's stop working and then **** starts to shut down with the secondary's??? I would love to know to then trigger a plenum a removal!

thanks

[dredgeguy]

Originally Posted by staminqia

Yes agreed! Mine cycles off for about 2 seconds with no issues. I don't know if this question has come up yet but at how many seconds will secondary's stop working and then **** starts to shut down with the secondary's??? I would love to know to then trigger a plenum a removal!

thanks

We are having a Wazoo maintenance day this Sunday Nov 14. Jim has posted in Mid-Atlantic section of the forum. Come on down!