Quiet Popping noise at air box

[vs ss]

I’ve heard it before. I’m pretty sure it’s the purge solenoid on the throttle body making the sound travel into the intake pipe.
It might not be the same noise, but I know the solenoid makes a soft popping noise in the air intake.

[Pete30nz]

Put a vacuum gauge on it. If it's a bad/broken valve spring, burnt valve or damaged seat etc it will show up.

I have a hand pumped vacumm bleeder with a gauge, could I use this?
If so where do I hook it up to?
Edit: I think just the fuel reg vac hose?

[Pete30nz]

I’ve heard it before. I’m pretty sure it’s the purge solenoid on the throttle body making the sound travel into the intake pipe.
It might not be the same noise, but I know the solenoid makes a soft popping noise in the air intake.

I guess it could be, but I don't know why.

[immortality]

Put a vacuum gauge on it. If it's a bad/broken valve spring, burnt valve or damaged seat etc it will show up.

I have a hand pumped vacumm bleeder with a gauge, could I use this?
If so where do I hook it up to?
Edit: I think just the fuel reg vac hose?

On any manifold vacuum source.

[Pete30nz]

Ok and what do I look for? For it to drop in pressure.

[immortality]

https://www.onallcylinders.com/2016/03/ ... -readings/