Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual ENGINE SECTION On Car Services MSA5TCD00L16106

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MSA5TCD00L16106


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                                           SERVICE PROCEDURE                                                 [W5A0] 2-2
                                                                                                 5. Intake Manifold Vacuum


5. Intake Manifold Vacuum                                           3) Keep the engine at the idle speed and read the
                                                                    vacuum gauge indication.
A: MEASUREMENT                                                      By observing the gauge needle movement, the
1) Warm-up the engine.                                              internal condition of the engine can be diagnosed
2) Disconnect the brake vacuum hose and install                     as described below.
the vacuum gauge to the hose fitting on the mani-
fold.




                                                                                                                   B2M3134


                                                                    Vacuum pressure (at idling, A/C "OFF"):
                                                                        Less than -60.0 kPa (-450 mmHg, -17.72
                                                                        inHg)

                             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 ten-   Leakage around intake manifold gasket or disconnection or
dency becomes more evident as engine temperature rises.         damaged vacuum hose
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 posi-   Sticky valves
tion.
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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