05-12-2017 | #1 |
Join Date: Nov 2016
Location: Florida
Posts: 66
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Hissing noise after plenum pull
The car makes an odd noise when its cranking, then when it finally starts it idles up to 3000 then comes down. Hissing appears to be coming from front drivers side near the throttle body.
Also: The car is not taking anymore coolant after draining it. Ive tried jacking the car up on its side to burp the system, but only a few bubbles come out. Any help? Sent from my iPhone using ZR-1 Net Registry |
05-12-2017 | #2 |
Join Date: Sep 2016
Location: Ocala, FL
Posts: 891
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Re: Hissing noise after plenum pull
I can help you. I live in Ocala. I will pm you my phone number.
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05-14-2017 | #3 |
Join Date: Apr 2017
Location: Missouri
Posts: 46
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Re: Hissing noise after plenum pull
My 90 ZR1 has a whistle when idling warm. My plenum was also recently R&R.
I would be interested to know what you find. Thanks! |
05-14-2017 | #4 |
Join Date: Apr 2007
Location: Northern VA
Posts: 2,657
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Re: Hissing noise after plenum pull
Hissing usually is a leaking plenum gasket. First try re torquing according to FSM procedure. If that doesn't solve it then try Jerry's thicker plenum gaskets which is what I did.
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Phil Wasinger 1994 Torch Red ZR-1 WAZOO Member George Braml Intake |
05-14-2017 | #5 |
Join Date: Apr 2017
Location: Missouri
Posts: 46
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Re: Hissing noise after plenum pull
Thanks, I'll check it out!
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05-14-2017 | #6 | |
Join Date: Nov 2016
Location: Florida
Posts: 66
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Re: Hissing noise after plenum pull
Quote:
Turned out to be a loose hose feeding into the plenum Sent from my iPhone using ZR-1 Net Registry |
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05-14-2017 | #7 |
Join Date: Apr 2017
Location: Missouri
Posts: 46
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Re: Hissing noise after plenum pull
Thanks for that info.
Back in the day I would use a propane torch (unlit of course) to look for vacuum leaks. When the propane gets sucked in the rpm goes up a bit. Has anyone found this to work on the ZR-1? |
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