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it may be one of your vacuum lines leaking and returning to the atmosphereic pressure The hissing noise could also be coming from an exhaust emissions part. This part is located on the fron right portion of the motor. I dont know the exact name but it attaches to the motor exhaust with two bolts, feel around this part when running, and see if it is leaking any exhaust from it.

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โˆ™ 2005-09-22 00:12:54
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Q: Why might a 1998 S-10 Blazer 231 V6 engine hiss around the intake manifold head joint near the front of the engine behind the air compressor after shutting down if no steam is present outside the engine or from the exhaust on start up?
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