Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 159

ME(w/o STI)-17

General Description

MECHANICAL

499987500

CRANKSHAFT
SOCKET

Used for rotating crankshaft.

18251AA020

VALVE GUIDE
ADJUSTER

Used for installing intake valve guides and
exhaust valve guides.

18353AA000

CLAMP PLIERS

• Used for removing and installing the PCV hose.
• This tool is made by the French company CAIL-
LAU. (code) 54.0.000.205
To make it easier to obtain, it has been provided
with a tool number.

18371AA000

CONNECTOR
REMOVER

Used for disconnecting the quick connector on
the fuel return hose side of the engine compart-
ment (intake manifold).

18471AA000

FUEL PIPE
ADAPTER

Used for inspecting the fuel pressure.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST-499987500

ST18251AA020

ST18353AA000

ST18371AA000

ST18471AA000

ME(w/o STI)-18

General Description

MECHANICAL

2. GENERAL TOOL

42099AE000

QUICK CONNEC-
TOR RELEASE

Used for removing the quick connector.

42075AG690

FUEL HOSE

Used for inspecting the fuel pressure.
NOTE:

This is the SUBARU genuine part.

1B022XU0

SUBARU SELECT
MONITOR III KIT

Used for various inspections.

TOOL NAME

REMARKS

Compression gauge

Used for measuring compression.

Timing light

Used for measuring ignition timing.

Vacuum gauge

Used for measuring intake manifold vacuum.

Oil pressure gauge

Used for measuring engine oil pressure.

Fuel pressure gauge

Used for measuring fuel pressure.

Angle gauge

Used for installing the crank pulley.

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

ST42099AE000

ST42075AG690

ST1B022XU0

ME(w/o STI)-19

Compression

MECHANICAL

2. Compression

A: INSPECTION

CAUTION:

After warming-up, engine becomes very hot. Be

careful not to burn yourself during measure-

ment.

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

switch to OFF.

2) Make sure that the battery is fully charged.

3) Remove the fuse of fuel pump from main fuse

box.

4) Start the engine and run it until it stalls.

5) After the engine stalls, crank it for five more sec-

onds.

6) Turn the ignition switch to OFF.

7) Remove all spark plugs. <Ref. to IG(w/o STI)-5,

REMOVAL, Spark Plug.>

8) Fully open the throttle valve.

9) Check the starter motor for satisfactory perfor-

mance and operation.

10) Install the compression gauge to the spark plug

hole.
NOTE:

When using a screw-in type compression gauge,

the screw should be less than 18 mm (0.71 in) long.

11) Crank the engine by starter motor and read the

value when the needle of the compression gauge

becomes stable.
NOTE:

• Perform at least two measurements per cylinder,

and make sure that the values are correct.

• If the compression pressure is out of standard,

check or adjust the pistons, valves and cylinders.
Compression (fully open throttle):

Standard

981 — 1,177 kPa (10 — 12 kgf/cm

2

, 142 —

171 psi)

Difference between cylinders

49 kPa (0.5 kgf/cm

2

, 7 psi) or less

12) After inspection, install the related parts in the

reverse order of removal.

FU-01122

ME-03009

ME(w/o STI)-20

Idle Speed

MECHANICAL

3. Idle Speed

A: INSPECTION

1) Before checking the idle speed, check the fol-

lowing item:

(1) Check the air cleaner element is free from

clogging, ignition timing is correct, spark plugs

are in good condition, and hoses are connected

properly.

(2) Check the malfunction indicator light does

not illuminate.

2) Warm up the engine.

3) Read the engine idle speed using Subaru Select

Monitor. <Ref. to EN(H4DOTC)(diag)-41, READ

CURRENT DATA FOR ENGINE (NORMAL

MODE), OPERATION, Subaru Select Monitor.>
NOTE:

• Idle speed cannot be adjusted manually, be-

cause the idle speed is automatically adjusted.

• If idle speed is out of standard, refer to the Gen-

eral Diagnosis Table under “Engine Control Sys-

tem”. <Ref. to EN(H4DOTC)(diag)-2, Basic

Diagnostic Procedure.>

(1) Check the idle speed when no-loaded.

(Headlight, heater fan, rear defroster, radiator

fan, A/C and etc. are OFF)

Idle speed (no load and gear shift lever in neu-

tral position):

Standard

700

±

100 rpm

(2) Check the idle speed when loaded. (Turn

the A/C switch to “ON” and operate the com-

pressor for at least one minute before measure-

ment.)

Idle speed (A/C ON and gear shift lever in neu-

tral position):

Standard

750

±

100 rpm