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                                                                                   EM-3
ENGINE MECHANICAL (1GR-FE)   -   COMPRESSION


                    COMPRESSION                                                    EM06C-06


                    INSPECTION
                    HINT:
                    If there is a lack of power, excessive oil consumption or poor fuel
                    economy, measure the compression pressure.
                    1.     WARM UP AND STOP ENGINE
                    Allow the engine to warm up to normal operating temperature.
                    2.     REMOVE SPARK PLUGS
                    (a) Remove the V-bank cover.
                    (b) Remove the air cleaner.
                    (c) Remove the intake air surge tank (See page EM-62).
                    (d) Remove the 6 ignition coils.
                    (e) Remove the 6 spark plugs.
                    (f)    Disconnect the 6 injector connectors.
                    3.     CHECK CYLINDER COMPRESSION PRESSURE
                    (a) Insert a compression gauge into the spark plug hole.
                    (b) Fully open the throttle.
                    (c) While cranking the engine, measure the compression
                           pressure.
                    HINT:
                    Always use a fully charged battery to obtain an engine speed
                    of 250 rpm or more.
           A22796   (d) Repeat steps (a) through (c) for each cylinder.
                    NOTICE:
                    This measurement must be done in the shortest possible
                    time.
                           Compression pressure:
                           1.3 MPa (13.3 kgf/cm2, 189 psi) or more
                           Minimum pressure: 1.0 MPa (10.2 kgf/cm2, 145 psi)
                           Difference between each cylinder:
                           0.1 MPa (1.0 kgf/cm2, 15 psi) or less
                    (e) If the cylinder compression pressure in 1 or more cylin-
                           ders is low, pour a small amount of engine oil into the cylin-
                           der through the spark plug hole and repeat steps (a)
                           through (c) for cylinders with low compression pressure.
                            S     If adding oil improves the compression pressure, it
                                  is likely that the piston rings and/or cylinder bore are
                                  worn or damaged.
                            S     If compression pressure stays low, a valve may be
                                  sticking, seating may be improper, or there may be
                                  a leak past the gasket.
                    4.     REINSTALL SPARK PLUGS
                    (a) Connect the 6 injector connectors.
                    (b) Install the 6 spark plugs.
                           Torque: 20 N

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