Subaru 2002 IMPREZA Service Manual page 1064

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2. Compression

A: INSPECTION

After warming-up, engine becomes very hot. Be

careful not to burn yourself during measure-

1) After warming-up the engine, turn the ignition

switch to OFF.

2) Make sure that the battery is fully charged.

3) Release the fuel pressure. <Ref. to FU(TUR-

BO)-53, RELEASING OF FUEL PRESSURE, OP-

ERATION, Fuel.>

4) Remove all the spark plugs. <Ref. to IG(TUR-

BO)-4, REMOVAL, Spark Plug.>

5) Fully open the throttle valve.

6) Check the starter motor for satisfactory perfor-

mance and operation.

7) Hold the compression gauge tight against spark

When using a screw-in type compression

gauge, the screw (put into cylinder head spark

plug hole) should be less than 18 mm (0.71 in)

8) Crank the engine by means of starter motor, and

then read the maximum value on the gauge when

the pointer is steady.

9) Perform at least two measurements per cylinder,

and make sure that the values are correct.

Compression (350 rpm and fully open throttle):

951 — 1,147 kPa (9.7 — 11.7 kgf/cm

834 kPa (8.5 kgf/cm

Difference between cylinders;

49 kPa (0.5 kgf/cm

ME(TURBO)-22

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2001 impreza