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08-11-2022
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#1 |
 Join Date: Nov 2016
Location: New Brunswick
Posts: 963
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Fixing Vacuum Leak at 1990 Dual Plenum Vacuum Connector
I've got a nasty vacuum leak at the dual connector. The metal hose doesn't seem to want to go deep enough into it to seal properly. If I push it in, maybe an 1/8 to a 1/4 inch more, it seals up. but as soon as I release it, its starts moaning again.
The connector is a new one from Jerry. Any suggestions to make it work?
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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08-11-2022
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#2 |
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Join Date: Nov 2016
Location: New Brunswick
Posts: 963
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Re: Fixing Vacuum Leak at 1990 Dual Plenum Vacuum Connector
Hopefully this video will help makes some sense of it. The leak is LOUD. You can easily hear it from inside the car.
https://youtu.be/srgYMdTxs1A
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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08-11-2022
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#3 |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,396
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Re: Fixing Vacuum Leak at 1990 Dual Plenum Vacuum Connector
Frequently, when the original connector failed, it was replaced with a hose on each pipe. The hose wall thickness required spreading the aluminum tubes/pipes apart to make room for the 2 hoses. Works for hose, but the pipes are no longer parallel. The connector holes are parallel. Forcing it onto the pipes without straightening back to parallel, can result in distortion of the connector & a vacuum leak.
Remove the connector & see if the pipes from under the plenum are parallel to each other and align properly to the spacing of the connector.
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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08-11-2022
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#4 | |
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Join Date: Nov 2016
Location: New Brunswick
Posts: 963
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Re: Fixing Vacuum Leak at 1990 Dual Plenum Vacuum Connector
Quote:
I have a backup new one also, so I can swap that one in. Is there any recommended way to bend them without breaking them? The long metal tube that comes from the back of the plenum does seem to be angled in a way to keep it from seating well. Is it adjustable also?
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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08-11-2022
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#5 |
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Join Date: Nov 2016
Location: New Brunswick
Posts: 963
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Re: Fixing Vacuum Leak at 1990 Dual Plenum Vacuum Connector
Out of curiosity, as this is a huge vacuum leak, what effect would it have on the operation of the engine?
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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08-11-2022
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#6 |
Join Date: Sep 2016
Location: Ocala, FL
Posts: 902
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Re: Fixing Vacuum Leak at 1990 Dual Plenum Vacuum Connector
High idle.
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Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much. |
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