Honda Civic manuals

Honda Civic Service Manual: Spark Plug Inspection (R18A9)

Honda Civic Service Manual / Powertrain / Engine / Ignition System / Spark Plug Inspection (R18A9)

1. Engine Cover


Remove the engine cover.

2. Ignition Coil


Remove the ignition coils.

3. Spark Plug


Remove the spark plugs.

1. Spark Plug - Inspection (Natural Gas Model)



Inspect the electrodes and the ceramic insulator.

Burned or worn electrodes may be caused by these conditions:

Advanced ignition timing

Loose spark plug

Plug heat range too hot

Insufficient cooling

Fouled plugs may be caused by these conditions:

Retarded ignition timing

Oil in combustion chamber

Incorrect spark plug gap

Plug heat range too cold

Excessive idling/low speed running

Clogged air cleaner element

Deteriorated ignition coils


Replace the plug at the specified interval, if the center electrode (A) is rounded, if the spark plug gap (B) is out of specification, or if the spark plug electrode is dirty or contaminated. Use only the spark plugs listed.


Do not adjust the gap of iridium tip plugs.

Do not use a plug cleaner.

Spark Plugs



Electrode Gap

Standard (New):

0.7-0.8 mm (0.028-0.031 in)

1. Spark Plug


Apply a small amount of anti-seize compound to the plug threads, and screw the plugs into the cylinder head, finger tight, then tighten the plugs to the specified torque.

Specified Torque:

18 N·m (1.8 kgf·m, 13 lbf·ft)

2. Ignition Coil


Install the ignition coils.

3. Engine Cover


Install the engine cover.

Spark Plug Inspection (K24Z7)
Removal 1. Wiper Arm Assembly NOTE: Set the wiper arms to the auto-stop position before removal. ...

Spark Plug Inspection (R18Z1)
1. Engine Cover 1. Remove the engine cover. 2. Ignition Coil ...

See also:

Honda Civic Owners Manual. Front Turn Signal Light Bulbs
Models with halogen headlights When replacing, use the following bulbs Front Turn Signal Light: 21 W (Amber) Turn the socket counter-clockwise and remove it.  Remove the old bulb and insert a new bulb. Front Turn Signal Lights Models with LED headlights Front turn signal ligh ...

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