Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 1995-1999 Approved Subaru Legacy 1995 1995 Service Manual ENGINE SECTION ON-CAR SERVICES MSA5TCD95L5454

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2-2
5. Intake Manifold Vacuum


                                                       5. Intake Manifold Vacuum
                                                       A: MEASUREMENT
                                                       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 as described
                                                       below.
                                                       Vacuum pressure (at idling, A/C "OFF"):
                                                          Less than -60.0 kPa
                                                          (-450 mmHg, -17.72 inHg)

                                           G2M0099


                            Diagnosis of engine condition by measurement of manifold vacuum
                   Vacuum gauge indication                                       Possible engine condition
 1. Needle is steady but lower than normal position. This       Leakage around intake manifold gasket or disconnection or
    tendency becomes more evident as engine temperature         damaged vacuum hose
    rises.
 2. When engine speed is reduced slowly from higher speed,      Back pressure too high, or exhaust system clogged
    needle stops temporarily when it is lowering or becomes
    steady above normal position.
 3. Needle intermittently drops to position lower than normal   Leakage around cylinder
    position.
 4. Needle drops suddenly and intermittently from normal        Sticky valves
    position.
 5. When engine speed is gradually increased, needle begins     Weak or broken valve springs
    to vibrate rapidly at certain speed, and then vibration
    increases as engine speed increases.
 6. Needle vibrates above and below normal position in narrow Defective ignition system or throttle chamber idle adjustment
    range.




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