Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 64
ME(STI)-18
General Description
MECHANICAL
499977500
CAM SPROCKET
WRENCH
Used for removing and installing intake cam
sprocket and exhaust cam sprocket.
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
CAILLAU. (code) 54.0.000.205
To make it easier to obtain, it has been provided
with a tool number.
18471AA000
FUEL PIPE
ADAPTER
Used for inspecting the fuel pressure.
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
ST-499977500
ST-499987500
ST18251AA020
ST18353AA000
ST18471AA000
ME(STI)-19
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(STI)-20
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(STI)-4, RE-
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(STI)-21
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
(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
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