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#1
02-02-2011, 12:40 PM
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Vacuum leak?
I replaced the upper intake on my 96 Blazer. It started right up, but I can hear a hissing sound like there is a vacuum leak. The hissing sound is near the firewall. The engine is not running very smooth. Engine does not die when I take my foot off the gas, but service engine light is on now. Any help with this would be greatly appreciated.
Last edited by cloner3; 02-02-2011 at 12:41 PM. Reason: 96 Blazer 
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#2
02-02-2011, 01:00 PM
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Re: Vacuum leak?
There are a few vacuum fittings and lines near the back of the plenum. Make sure they're all connected.
__________________
You have to know how it works, to figure out why it doesn't.
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#3
02-02-2011, 09:01 PM
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Re: Vacuum leak?
A smoke test works good for pinpointing vacuum leaks.
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