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There is a distinct sound that has a hissing component when you first turn on the key. It will last a second or two when the key is turned to the run position. When the engine started the sound will return and continue to produce the noise so long as the engine is running.
A relatively low noise is normal. If you are concerned check other like cars for the loudness level.
The pressure regulator on the fuel rail can also produce a sound when the fuel pump is running. The regulator is under the hood and any reasonable noise would not be a concern, A clicking sound is also normal throughout the fuel system when the engine is running created by the fuel injectors cycling.
Josh, your catalytic converter is shot (plugged). This caused a back-up of exhaust into the egr system. Probably melted the flexible tubing to the sensor, and may have damaged the sensor and/or the egr valve itself. The hissing you heard was the exhaust venting from the egr system. The converter being plugged caused you to lose power until the exhaust found a way out of the engine via the egr system...
Is there any problems with the brakes besides the noise? If theyre acting up, it could be your brake booster. It's hard to determine without more specific details, brakes always make a quiet hissing noise, depends on where, how loud, how the pedal feels...
Rough running and hissing noise, are most likely an indication of a vacuum leak. Check your vacuum hoses and repare or replace any that are broken or brittle.
The noise maybe the p/s pump fluid return,GM had some problem with this but nothing bad. GM makes a resticter that goes in the return line of the pump, it will slow the fluid down going back in the pump stopping the hissing sound.
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