Quote:
Originally Posted by IOM Bullet
The banging sounds like the trunk monkey. It has something to do with a butterfly valve doing its job. I think it's pretty common in our cars. It sounds like 3-4 little banging sounds usually after the car warms up. I have gotten use to the sound, so I don't always hear it anymore.
As for the hissing sound, I am not sure. Although, about two months ago I bought aftermarket tire stem caps, and one day the tire pressure dic came on. I went to fill it with air and could hear a hissing sound. I took the stem cap off and noticed the rubber seal from the cap was wedged in the valve stem and valve. I just pried it out with a paper clip.
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There's an evap solenoid that clicks 5 times in rapid succession within a few minutes of a cold start. It's predictable and repeatable and unrelated to vehicle speed or dynamics.