Honda Civic. Manual — part 786

3. Replace the plug at the specified interval, or if the center electrode is rounded

(A), or if the spark plug gap is out of specification. Use only the listed spark
plugs.

Spark Plugs

NGK: IZFR6K11S

DENSO: SKJ20DR-M11S

Electrode Gap

Standard (New): 1.0-1.1 mm (0.039-0.043 in.)

Fig. 12: Identifying Spark Plugs And Electrode Gap
Courtesy of AMERICAN HONDA MOTOR CO., INC.

4. Apply small amount of anti-seize compound to the plug threads, and screw the

plugs into the cylinder head, finger-tight. Then torque them to 25 N.m (2.5
kgf.m, 18 lbf.ft).

electrode since this will damage the electrode.

When using a sand blaster spark plug cleaner, do
not clean for more than 20 seconds to avoid
damaging the electrode.

NOTE:

Do not adjust the gap (B) of iridium tip plugs.

2008 Honda Civic EX

2006-08 ENGINE Ignition System (R18A1) - Civic (All Except Hybrid)

2006-08 ENGINE

Ignition System - Civic GX

COMPONENT LOCATION INDEX

NOTE:

Refer to the IGNITION SYSTEM (R18A1) article for additional
information that is not shown in this article.

2008 Honda Civic EX

2006-08 ENGINE Ignition System - Civic GX

2008 Honda Civic EX

2006-08 ENGINE Ignition System - Civic GX

Fig. 1: Identifying Ignition System Component Location

SPARK PLUG INSPECTION

2008 Honda Civic EX

2006-08 ENGINE Ignition System - Civic GX

1. Remove the spark plugs and inspect the electrodes and ceramic insulator.

Burned or worn electrodes may be caused by:

Advanced ignition timing

Loose spark plug

Plug heat range too hot

Insufficient cooling

Fouled plugs may be caused by:

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

Fig. 2: Identifying Spark Plug Gap

2. If the spark plug electrode is dirty or contaminated, clean the electrode with a

plug cleaner.

2008 Honda Civic EX

2006-08 ENGINE Ignition System - Civic GX