Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSINFINITI2002Q45 V8-4.5L (VK45DE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGSERVICE AND REPAIR
2002 Infiniti Q45 V8-4.5L (VK45DE)
Spark Plug: Service and Repair
2002 Infiniti Q45 V8-4.5L (VK45DE)SECTION Service and Repair
REMOVAL
1. Remove ignition coil.
2. Remove spark plug.
Disconnect ignition wire from spark plug at boot. Do not pull on the wire.
Reconnect ignition wires according to numbers indicated on them.
INSPECTION AFTER REMOVAL
Use standard type spark plug for normal condition.
The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions such as:
- frequent engine starts
- low ambient temperatures
The cold type spark plug is suitable when spark plug knock occurs with the standard type spark plug under conditions such as:
- extended highway driving
- frequent high engine revolution
Gap (Nominal):..........1.1 mm (0.043 inch)
- Do not use a wire brush for cleaning.
- If plug tip is covered with carbon, spark plug cleaner may be used.
Cleaner air pressure:..........Less than 588 kPa (6 kg/cm2, 85 psi)
Cleaning time:..........Less than 20 seconds
- Checking and adjusting plug gap is required between change intervals.
INSTALLATION
Install in the reverse order of removal.
Tightening Torque:..........20 - 29 Nm (2.0 - 3.0 kg/m, 14 - 22 ft. lbs.)
1. Remove ignition coil.
2. Remove spark plug.
Disconnect ignition wire from spark plug at boot. Do not pull on the wire.
Reconnect ignition wires according to numbers indicated on them.
INSPECTION AFTER REMOVAL
Use standard type spark plug for normal condition.
The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions such as:
- frequent engine starts
- low ambient temperatures
The cold type spark plug is suitable when spark plug knock occurs with the standard type spark plug under conditions such as:
- extended highway driving
- frequent high engine revolution
Gap (Nominal):..........1.1 mm (0.043 inch)
- Do not use a wire brush for cleaning.
- If plug tip is covered with carbon, spark plug cleaner may be used.
Cleaner air pressure:..........Less than 588 kPa (6 kg/cm2, 85 psi)
Cleaning time:..........Less than 20 seconds
- Checking and adjusting plug gap is required between change intervals.
INSTALLATION
Install in the reverse order of removal.
Tightening Torque:..........20 - 29 Nm (2.0 - 3.0 kg/m, 14 - 22 ft. lbs.)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.