ME(H4SO)-25
Intake Manifold Vacuum
MECHANICAL
5. Intake Manifold Vacuum
A: INSPECTION
1) Warm up the engine.
2) Disconnect the brake booster vacuum hose from
the intake manifold, and install the vacuum gauge.
3) Keep the engine at idle speed and read the vac-
uum gauge indication.
By observing the vacuum gauge needle move-
ment, the internal condition of the engine can be di-
agnosed as described below.
Intake manifold vacuum (at idling, A/C OFF):
–60.0 kPa (–450 mmHg, –17.72 inHg) or more
ME-00813
Diagnosis of engine condition by measurement of intake manifold vacuum
Vacuum gauge indication
Possible engine condition
1. Needle is steady but lower than normal position. This tendency
becomes more evident as engine temperature rises.
Air leakage around intake manifold gasket, disconnection or
damage of vacuum hose
2. Needle intermittently drops to position lower than normal position. Leakage around cylinder
3. Needle drops suddenly and intermittently from normal position.
Sticky valve
4. When engine speed is gradually increased, needle begins to
vibrate rapidly at certain speed, and then vibration increases as
engine speed increases.
Weak or broken valve springs
5. Needle vibrates above and below normal position in narrow range. Defective ignition system
Содержание 2009 IMPREZA
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