[rabbit86_]

Originally Posted by radroach

Your car sounds great. Your car has 8 injectors and a mechanical fuel pump right up front. They all click, and sometimes chirp. Sometimes they will make more noise depending on gas quality, or if you're idling with A/C or fans running, duty cycle or fuel trim.

sometimes the injectors will make different noises

Here's my car's, pre-recall last spring, 105k miles, you'll hear the injectors had a notably raspy tone one day (so I took a video)

And here it is a month later after recall, 110k miles later that summer, and it sounds more clean running, you can hear all the different injector idle duty cycles through 10:00 of video, the direct injectors running at halfway through the video sound quieter:

I think its a factor of gas quality, ethanol content, and duty cycle causing injector noises.

***