Mazda CX-9 Grand Touring 2009 Manual page 1809

2008 ENGINE PERFORMANCE Ignition System (MZI-3.7) - Mazda CX-9
Spark plug gap
1.29-1.45 mm {0.051-0.057 in}
CLEANING
CAUTION:
NOTE:
To avoid possible damage to the tip, use gasoline to clean the spark plugs
after removing dirt.
If the accelerator pedal is depressed continuously for a specified time, the
engine speed may decrease to the idle speed. This is does not indicate a
malfunction.
Do not perform no-load racing at high engine speed continuously for 10 s
or more .
1. If there is carbon adhering to the spark plug, perform no-load racing at 4,000 rpm for 2 min, 2 times .
VISUAL INSPECTION
1. Inspect the following items:
If any of the following malfunctions are indicated, replace the spark plug.
Insulator breakage
Worn electrode
Damaged gasket
Badly burned insulator (sparking side)
2008 Mazda CX-9 Grand Touring
Carbon may adhere to the tip of the spark plug during vehicle
delivery or repeated short distance driving during the winter time. If
there is any malfunction such as rough idling or start difficulty due to
carbon adhesion causing plug fouling, burn off the carbon by
performing no-load racing of the engine.
When performing the no-load racing, apply the side brake and foot
brake, move the selector lever to P position to prevent an accident
and serious injury.
To avoid possible damage to the spark plug tip, do not use a wire
brush for cleaning.