Subaru Crosstrek Service Manual: Inspection

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

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)

Spark plug

Removal

Other materials:

Installation
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List of diagnostic trouble code (dtc) List
TIRE PRESSURE MONITORING SYSTEM (DIAGNOSTICS) > List of Diagnostic Trouble Code (DTC)LISTDTCItemContents of diagnosisRemarksC2021TIRE 1 AIR PRESSURE LOW (NORMAL MODE)Tire pressure of tire 1 is reduced. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2021 TIRE 1 AIR PRESSURE LOW ...

Inspection
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