Subaru Legacy Service Manual: Inspection

Subaru Legacy Service Manual / Ignition(h6do) / Spark plug / Inspection

1. Check the spark plug for abnormalities. If defective, replace the spark plug.

(A)

Terminal damage

(B)

Crack or damage in insulator

(C)

Damaged gasket

2. Check the spark plug electrode and condition of the insulator. If abnormal, check and repair the cause and replace the spark plug.

(1) Normal:

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

(2) Carbon fouled:

Dry fluffy carbon deposits on the insulator and electrode are mostly caused by slow-speed driving in town, weak ignition, too rich fuel mixture, etc.

(3) Oil fouled:

Wet black deposits show oil entrance into combustion chamber through worn piston rings or increased clearance between valve guides and valve stems.

(4) Overheating:

A white or light gray insulator with black or brown spots and bluish burnt electrodes indicate engine overheating, wrong selection of fuel, or loose spark plugs.

3. Using a nylon brush, etc., clean and remove the carbon or oxide deposits from the spark plug. If deposits are too stubborn, replace the spark plugs. After cleaning the spark plugs, check the spark plug gap “L” using a gap gauge. If it is not within the standard, replace the spark plug.

NOTE:

• Never use a plug cleaner.

• Do not use a metal brush as it may damage the electrode area.

Spark plug gap L:

Standard

1.0 — 1.1 mm (0.039 — 0.043 in)

Removal

Spark plug:Refer to “SPECIFICATION” for spark plug. General Description > SPECIFICATION1. RH SIDE1. Remove the collector cover.(1) Carefully pull up the rear of collector cover at two pos ...

Installation

1. RH SIDE1. Install the spark plugs using a spark plug socket.Tightening torque:21 N·m (2.1 kgf-m, 15.5 ft-lb)(A)Ratchet handle(B)Extension bar(C)Universal joint(D)Spark plug socket 2. Inst ...

Other materials:

Dtc b1632 curtain airbag sensor rh lost communication
DIAGNOSIS START CONDITION:Ignition voltage is 10 V to 16 V.DTC DETECTING CONDITION:Curtain airbag sensor RH communication error (open/short circuit or connector connection failure between airbag CM and sensor, sensor internal communication circuit failure, CM internal communication circuit failure)C ...