Are TBI Injectors Noisy?

[Porquer]

I’m trying to solve a rich-at-idle condition with my 2.5 TBI. I’m still learning my way around this system. My question: is it normal for the injector itself to be noisy? It makes a chattering/rattling sound that I can hear from the cab while sitting at idle. I have confirmed that the sound is indeed coming from the injector, or somewhere very near it within the throttle body.

[eaglescout526]

Oh that’s pretty loud. Typically you shouldn’t be able to hear it from inside the cab unless you don’t have the bonnet on. Or it’s being amplified by an empty air box. 

[Porquer]

 

Here’s a short video at idle.

 

[eaglescout526]

Well it sounds right and healthy. 
 

Are you missing much of the air filtration system?