Hissing Near Throttle - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-08-2006, 11:09 PM   #1
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Default Hissing Near Throttle

Today I had my lower intake manifold gasket replaced at a local shop. Coolant was leaking internally. Anyways I drove it around and noticed it would keep at around 1600 rpm and hold a speed without touching the gas. After a while the SES light came on and the idle became loopy. I looked under the hood and noticed hissing near the throttle body. I can't really feel any air coming out of the hoses around there so what else do you think it could come from?
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Old 11-08-2006, 11:13 PM   #2
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Check the vacuum lines.


Then take it back and enlarge the shops' posterior.
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Old 11-08-2006, 11:23 PM   #3
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Then take it back and enlarge the shops' posterior.
Haha, I think i'll push em for a free tranny flush.
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Old 11-09-2006, 01:18 AM   #4
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You have a vacuum leak. Want to prove it to them? Take some carb cleaner with you, and spray it around that area while idling. When you hear the idle change, you found the leak.
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Old 11-10-2006, 04:07 PM   #5
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When I did my UIM/LIM repair, I left one vacuum line detached from the throttle body and got exactly the symptoms you have. Once I hooked it back up it ran perfectly.
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