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Ignition System - Dohc/tc Subaru Impreza WRX GD/GG рестайлинг

Ignition System 18 illustrations ~614 words

Scheme 23

Scheme 23: SPECIFICATIONS
Scheme 23: SPECIFICATIONS

Scheme 24

Scheme 24: COMPONENTS
Scheme 24: COMPONENTS

CAUTION

  1. Wear working 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 or 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 your hands, 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 safety stands at the specified points.
  8. Before disconnecting electrical connectors of sensors or units, be sure to disconnect the negative terminal from battery.

REMOVAL

CAUTIONAll spark plugs installed on an engine, must be of the same heat range.
  1. Spark plug: NGK-PFR6G

Scheme 25

Scheme 25: RH SIDE
Scheme 25: RH SIDE

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Scheme 27

Scheme 28

Scheme 28
Scheme 28
  1. Disconnect the ground terminal from battery.
  2. Remove the air cleaner lower case, see «REMOVAL»(/subaru/impreza-wrx/gdgg-2002-2005/remont/mechanical/#air-intake-system-h4dotc) , Air Cleaner.
  3. Disconnect the connector from ignition coil.
  4. Remove the ignition coil.
  5. Remove the spark plugs with the spark plug sockets.

Scheme 29

Scheme 29: LH SIDE
Scheme 29: LH SIDE

Scheme 30

Scheme 30
Scheme 30

Scheme 31

Scheme 31
Scheme 31

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Scheme 32
Scheme 32

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Scheme 33

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Scheme 34
Scheme 34
  1. Disconnect the battery terminals, and then remove the battery and battery carrier.
  2. Disconnect the washer motor connector.
  3. Disconnect the rear window glass washer hose from washer motor, then plug connection with a suitable cap.
  4. Remove the two bolts which hold the washer tank, then take the tank away from the working area.
  5. Disconnect the connector from ignition coil.
  6. Remove the ignition coil.
  7. Remove the spark plugs with the spark plug sockets.

RH SIDE

  1. Install in the reverse order of removal.
  1. Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15 ft-lb)
  2. Tightening torque (Ignition coil): 16 N.m (1.63 kgf-m, 11.8 ft-lb)
CAUTIONThe 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 approximately 1/3 of the specified torque in order to avoid over-stressing.

LH SIDE

  1. Install in the reverse order of removal.
  1. Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15 ft-lb)
  2. Tightening torque (Ignition coil): 16 N.m (1.63 kgf-m, 11.8 ft-lb)
CAUTIONThe 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 approximately 1/3 of the specified torque in order to avoid over-stressing.

INSPECTION

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

Scheme 35

Scheme 35: INSPECTION
Scheme 35: INSPECTION

NORMAL

Brown to grayish-tan deposits and slight electrode wear indicate correct spark plug heat range.

Scheme 36

Scheme 36: NORMAL
Scheme 36: NORMAL

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, dirty air cleaner, etc.

It is advisable to replace with plugs having hotter heat range.

Scheme 37

Scheme 37: CARBON FOULED
Scheme 37: CARBON FOULED

OIL FOULED

Wet black deposits show excessive oil entrance into combustion chamber through worn rings and pistons or excessive clearance between valve guides and stems. If the same condition remains after repair, use a hotter plug.

Scheme 38

Scheme 38: OIL FOULED
Scheme 38: OIL FOULED

OVERHEATING

White or light gray insulator with black or gray brown spots and bluish burnt electrodes indicate engine overheating. Moreover, the appearance results from incorrect ignition timing, loose spark plugs, wrong selection of fuel, hotter range plug, etc. It is advisable to replace with plugs having colder heat range.

Scheme 39

Scheme 39: OVERHEATING
Scheme 39: OVERHEATING

ADJUSTMENT

Clean the spark plugs in a sand blast type cleaner. Avoid excessive blasting. Clean and remove the carbon or oxide deposits, but do not wear away porcelain.

If deposits are too stubborn, replace the plugs. After cleaning the spark plugs, recondition the firing surface of electrodes with file. Then correct the spark plug gap using a gap gauge.

  1. Spark plug gap "L": 0.7-0.8 mm (0.028-0.031 in)

Scheme 40

Scheme 40
Scheme 40

Note. Replace with a new spark plug if this area (A) is worn to "ball" shape.

Direct ignition type has been adopted.

For removal procedure. See REMOVAL , Spark Plug.

INSTALLATION

Install in the reverse order of removal.

  1. Tightening torque: 16 N.m (1.63 kgf-m, 11.8 ft-lb)

Ignitor is integrated with the coil. Therefore resistance cannot be measured.

See also:
• REMOVAL
• REMOVAL

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