Thread: Low engine vacuum but no vacuum leaks.

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Originally Posted by 34_40

In addition to what every one else has offered.
Don't hesitate to open the exhaust at the manifolds and re-do a vacuum test. It's not seen much anymore but exhaust pipe sometimes had a interior pipe that would swell and kink closing off the pipe. This would effectively choke the motor airflow/vacuum. Like I said, you don't see this anymore but it should be easy (relatively speaking) to open the headers/manifolds and double check the vacuum.

Could you please specify what you mean by opening the exhaust at the manifold ? Do you mean to remove the exhaust manifold to check for obstruction? Thanks