HU10 - Check For Vacuum Leaks

- Key On, engine running.

- With engine at idle, listen for vacuum leaks.

- Inspect the entire inlet air system from the Mass Air Flow (MAF) sensor to the intake manifold for leaks such as:
- Cracked or punctured inlet air tube.
- Loose connections on the inlet air tube at the air cleaner housing or throttle body.
- Idle Air Control (IAC) valve assembly or gasket seal.
- Intake manifold assembly or gasket seal.
- EGR valve diaphragm or control solenoid.
- Vacuum supply connectors and hose.
- PCV connectors and hose.

- Are any leaks detected in the above areas?

YES -- SERVICE as necessary.

NO -- GO to HU11. HU11 - Check Idle