Purge Valve Connection on Plenum? - ZR-1 Net Registry Forums

Alex0413 · 07-13-2020

I recently put my plenum back on the LT5, and noticed on the front drivers side there were two vacuum connections. One of them I had a connection for, the other I did not. The One I had no hose to connect to it was labeled as "Purge Solenoid Connection" in the GM LT5 service manual. Is this an un-needed emissions vacuum connection that the previous owner disconnected and I need to cap? Or am I missing something?

G8nightman · 07-13-2020

If you are looking at it on the drivers side the right connection is for the secondaries with out it they are not working and you are not getting full power

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Alex0413 · 07-13-2020

Quote:

Originally Posted by G8nightman

If you are looking at it on the drivers side the right connection is for the secondaries with out it they are not working and you are not getting full power

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Thanks for the feedback, but doesn't the secondary vacuum come from the middle of the plenum? I'm referring to the two nipples at the front of the plenum (parallel to each other), behind the throttle body on the drivers side.

Specifically, #9 on this diagram. The nipple is straight on my 1990 Plenum, but same location. Labeled as "Purge Canister Hose Location".. Which I assume is for the EVAP system for the furl tank?
IMG_3742.jpg

G8nightman · 07-14-2020

Sorry i thought you meant under the plenum.

07-13-2020	#1
Alex0413 Join Date: Jun 2020 Location: Baton Rouge, LA Posts: 46	Purge Valve Connection on Plenum? I recently put my plenum back on the LT5, and noticed on the front drivers side there were two vacuum connections. One of them I had a connection for, the other I did not. The One I had no hose to connect to it was labeled as "Purge Solenoid Connection" in the GM LT5 service manual. Is this an un-needed emissions vacuum connection that the previous owner disconnected and I need to cap? Or am I missing something?

07-13-2020	#2
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,188	Re: Purge Valve Connection on Plenum? If you are looking at it on the drivers side the right connection is for the secondaries with out it they are not working and you are not getting full power Sent from my iPhone using ZR-1 Net Registry __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"

07-14-2020	#4
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,188	Re: Purge Valve Connection on Plenum? Sorry i thought you meant under the plenum. __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"