Ignition (h4dotc Engine) Subaru Impreza WRX GD/GG рестайлинг 2

SPECIFICATION

GENERAL SPECIFICATION

Identifying Spark Plug, Ignition Coil And Ignitor Assy. Scheme 21

CAUTION

1. Wear work clothing, including a cap, protective goggles, and protective shoes during operation.
2. Remove contamination including dirt and corrosion before removal, installation or disassembly.
3. Keep the disassembled parts in order and protect them from dust and dirt.
4. Before removal, installation or disassembly, be sure to clarify the failure. Avoid unnecessary removal, installation, disassembly, and replacement.
5. Be careful not to burn yourself, because each part on the vehicle is hot after running.
6. Be sure to tighten fasteners including bolts and nuts to the specified torque.
7. Place shop jacks or rigid racks at the specified points.
8. Before disconnecting electrical connectors of sensors or units, be sure to disconnect the ground cable from battery.

REMOVAL

Spark plug

NGK: ILFR6B

Scheme 22

Scheme 23

Scheme 24

1. Disconnect the ground cable from battery.
2. Remove the air cleaner lower case. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/mechanical/#intake-induction-h4dotc-engine), Air Cleaner Case. >
3. Disconnect the connector from ignition coil and ignitor assembly. (Scheme 22): Locating Ignition Coil And Ignitor Assembly
4. Remove the ignition coil and ignitor assembly. (Scheme 23): Locating Ignition Coil And Ignitor Assembly With Bolts
5. Remove the spark plugs with the spark plug sockets. (Scheme 24): Identifying Spark Plugs With Spark Plug Sockets

Scheme 25

Scheme 26

Scheme 27

1. Remove the battery and battery carrier. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/charging-system/#startingcharging-systems-h4so), Battery. >
2. Remove the secondary air pump. < Ref. to «REMOVAL»(/subaru/impreza-wrx/gdgg-2-2005-2007/remont/fuel-system/#emission-control-aux-emission-control-devices-h4dotc-engine), Secondary Air Pump. >
3. Disconnect the connector from ignition coil and ignitor assembly. (Scheme 25): Identifying Ignition Coil And Ignitor Assembly
4. Remove the ignition coil and ignitor assembly. (Scheme 26): Identifying Ignition Coil And Ignitor Assembly With Bolt
5. Remove the spark plugs with the spark plug sockets. (Scheme 27): Identifying Spark Plugs With Spark Plug Sockets

RH SIDE

Install in the reverse order of removal.

Tightening torque (Spark plug)

21 N.m (2.1 kgf-m, 15.2 ft-lb)

Tightening torque (Ignition coil and ignitor assembly)

16 N.m (1.6 kgf-m, 11.7 ft-lb)

Note. The above torque should be only applied to new spark plugs without oil on their threads. In case their threads are lubricated, the torque should be reduced by approx. 1/3 of the specified torque in order to avoid over-stressing.

LH SIDE

Install in the reverse order of removal.

Tightening torque (Spark plug)

21 N.m (2.1 kgf-m, 15.2 ft-lb)

Tightening torque (Ignition coil and ignitor assembly)

16 N.m (1.6 kgf-m, 11.7 ft-lb)

Note. The above torque should be only applied to new spark plugs without oil on their threads. In case their threads are lubricated, the torque should be reduced by approx. 1/3 of the specified torque in order to avoid over-stressing.

INSPECTION

Check the electrodes and inner and outer ceramic insulator of plugs, noting the type of deposits and the degree of electrode erosion.

Identifying Spark Plug Gap. Scheme 28

Scheme 29

Scheme 30

Scheme 31

1. Normal: Brown to grayish-tan deposits and slight electrode wear indicates correct spark plug heat range. (Scheme 29): Identifying Normal
2. Carbon fouled: Dry fluffy carbon deposits on insulator and electrode are mostly caused by slow speed driving in city, weak ignition, too rich fuel mixture and dirty air cleaner, etc. (Scheme 30): Identifying Carbon Fouled
3. Oil fouled: Wet black deposits show oil entrance into combustion chamber through worn rings and pistons or excessive clearance between valve guides and stems. (Scheme 31): Identifying Oil Fouled
4. Overheating

White or light gray insulator with black or brown spots and bluish burnt electrodes indicates engine overheating. Moreover, the appearance results from incorrect ignition timing, loose spark plugs, wrong selection of fuel, hotter range plug, etc.

Identifying Overheating. Scheme 32

ADJUSTMENT

Clean the spark plugs with a wire brush. Clean and remove the carbon or oxide deposits, but do not wear away ceramic insulator.

If deposits are too stubborn, replace the plugs.

After cleaning the spark plugs, correct the spark plug gap using a gap gauge.

Note. Do not use spark plug cleaners, because the spark plugs are applied with iridium tips.

Spark plug gap L

0.7 - 0.8 mm (0.028 - 0.031 in)

Identifying Spark Plug Gap. Scheme 33

Direct ignition type has been adopted. Refer to the "Spark Plug Removal" for removal procedure. < Ref. to REMOVAL , Spark Plug. >

INSTALLATION

Install in the reverse order of removal.

Tightening torque

16 N.m (1.6 kgf-m, 11.7 ft-lb)

For inspection, refer to the following. < Ref. to IGNITION CONTROL SYSTEM , Diagnostics for Engine Starting Failure. >

See also:
• REMOVAL
• REMOVAL
• REMOVAL
• IGNITION CONTROL SYSTEM
• REMOVAL