Spark Plug Inspection; Spark Plug Usage - Suzuki XL7 2007 Service Manual

1H-6 Ignition System:
2. Install the spark plug.
Tightening torque
Tighten the spark plug to 20 N⋅m (15 lb ft).
3. Install the ignition coil(s). Refer to "Ignition Coil
Replacement - Bank 1" and/or "Ignition Coil
Replacement - Bank 2".

Spark Plug Inspection

Spark Plug Usage

• Ensure that the correct spark plug is installed. An
incorrect spark plug causes driveability conditions.
Refer to "Ignition System Specifications" for the
correct spark plug.
• Ensure that the spark plug has the correct heat range.
An incorrect heat range causes the following
conditions:
– Spark plug fouling—Colder plug
– Pre-ignition causing spark plug and/or engine
damage—Hotter plug
Spark Plug Inspection
• Inspect the terminal post (1) for damage.
– Inspect for a bent or broken terminal post (1).
– Test for a loose terminal post (1) by twisting and
pulling the post. The terminal post (1) should NOT
move.
• Inspect the insulator (2) for flashover or carbon
tracking, soot. This is caused by the electrical charge
traveling across the insulator (2) between the terminal
post (1) and ground. Inspect for the following
conditions:
– Inspect the spark plug boot for damage.
– Inspect the spark plug recess area of the cylinder
head for moisture, such as oil, coolant, or water. A
spark plug boot that is saturated causes arcing to
ground.
• Inspect the insulator (2) for cracks. All or part of the
electrical charge may arc through the crack instead of
the electrodes (3, 4).