Community Member Credit: JakeOfAllTrades
The plastic tube below is the “Sound Generator”. The Sound Generator is the noise you hear that makes your car sound as if it is shifting and it kinda gives a Growling noise when you jump on the CVT.
Nissan made the Sound Generator and piped it into the interior of our cars so that we can hear it and make it seem as though the CVT is going through the gears because without it (Sound Generator) the car/CVT was too quiet and we wouldn’t know what’s going on.
This is the cap I got. it was $2.90 at Lowes.
This is the rubber intake hose I removed to get at the plastic noisemaker tube. It connects the airbox and throttle body.
As you can see, there are three hose clamps that needed to be removed to take the intake hose out. I started by removing the cover from the air filter box. I needed to remove the hose clamp and then also disconnect the mass airflow sensor and the cable ties that held it in place. Here’s what it looked like after I removed the airbox lid exposing my air filter (red filter at bottom of the picture).
After I loosened all three hose clamps. I just pulled up and out on the rubber tube and the plastic “noisemaker” slid out (it was held to the rubber tube with another hose clamp, but I didn’t need to loosen this one until after I got it out). Here’s the rubber intake hose with the plastic noisemaker still attached (It’s resting on the battery in the picture).
I then removed the plastic noisemaker and secured the cap over the hole. I could actually tighten it fairly tight, I kept checking the inside of the hole to make sure it wasn’t collapsing, and it withheld quite a bit of pressure.
After that, I just hooked the rubber intake hose back into place and tightened all the hose clamps back down.
BAM. Quiet cabin.
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