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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.

immortality wrote: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?

vs ss wrote: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.

Pete30nz wrote:

immortality wrote: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.

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