Throttle body vibration?

[Elk1007]

So I'm at my wits end trying to locate (and fix) a loud, high frequency rattle noise inside the engine compartment.

It can be heard when applying the gas pedal a certain amount. In other words, I can "find" the noise and maintain it at a certain rpm.

The noise is coming from the back of the engine near the firewall. It feels and sounds like it's coming from the throttle body plate and vibrating the gas pedal. I cleaned the plate and it isn't loose.

The issue doesn't seem to be affecting engine performance.

Any ideas?

EDIT:

The sound is noticeable while driving (under load). When in park, I can find an rpm where the throttle body seems to take a heavy wave of vibration from the engine and hum (but not nearly as loud as while driving). Issue existed before I put on new motor mounts, and still persists after replacing all 4 (although the vibration and noise are reduced).

[somick]

What year?

Mileage?

I would think that noise might be coming from the heat shield. That is why you hear it at the back of the engine.

Good luck,
Sam

[Elk1007]

Completely possible.

I'd check the exhaust tomorrow

Honestly I have a mitsu, not a honda. But almost no one vistits the mitsu subforum

EDIT:

The heat shield didn't rattle :/

Upon further inspection, I am 85% sure the sound is coming from the throttle body return springs. What kind of grease, lubricant, etc can I apply to them that would prevent rattle but allow them to function?

[somick]

Originally Posted by Elk1007

Completely possible.

I'd check the exhaust tomorrow

Honestly I have a mitsu, not a honda. But almost no one vistits the mitsu subforum

EDIT:

The heat shield didn't rattle :/

Upon further inspection, I am 85% sure the sound is coming from the throttle body return springs. What kind of grease, lubricant, etc can I apply to them that would prevent rattle but allow them to function?

I would try silicone grease but have no idea where TB is located and how it will work.

Good luck,
Sam

[Elk1007]

Do you know what this is? It is part of the throttle body.

imgur.com/cBebafC
imgur.com/xb1NjhC