Forester S F4-2.5L DOHC (1998)
Intake Manifold: Testing and Inspection
1) Warm-up the engine.
2) Disconnect the brake vacuum hose and install the vacuum gauge to the hose fitting on the manifold.
3) Keep the engine at the idle speed and read the vacuum gauge indication. By observing the gauge needle movement, the internal condition of the
engine can be diagnosed.
Vacuum pressure (at idling, A/C "OFF"):
Less than -60.0 kPa (-450 mm-Hg, -17.72 in-Hg)
