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2003 Nissan 350z Spark Plug and Coil Pack Replacement

If your Nissan 350z has hesitation in...

iFixit Library Nissan 350Z Moderate 1 hour Guide 171031

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Guide overview

Before you begin

If your Nissan 350z has hesitation in acceleration or excessive vibration, follow this guide to replace the Cylinder 2 ignition coil and spark plug. The failure of a coil pack or spark plug will cause your car's Check Engine Light to illuminate. The code is P0302 (Cylinder 2 Misfire). Before using this guide use an OBD2 scanner to check for a misfire check engine light code. This service is free at some auto parts stores such as AutoZone. Before beginning this repair turn off your car, and put it in park. In addition, make sure the car battery is completely disconnected.

Step 1

Repair step

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Pull the hood latch located in the drivers side footwell, to release the lock.
Open the hood and use the hood prop to secure.

Step 2

Repair step

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Use the push tab to release the battery cover and remove it from the engine bay.

Step 3

Repair step

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Loosen the ground terminal connected to the battery using a 10 mm socket and ratcheting wrench.
Place the ground terminal outside the battery cover and replace the cover.
The car battery circuit should be incomplete throughout the repair.

Step 4

Repair step

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Use a ratcheting wrench and a 15 mm socket to remove the six 44.5 mm long bolts and two nuts on the strut tower brace.

Step 5

Repair step

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Use a ratcheting wrench and a 10 mm socket to loosen and remove the three 12.7 mm bolts holding the wiring bracket in place.

Step 6

Repair step

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Use the 10 mm socket wrench to remove the two 12.7 mm bolts that connect to the wiring harness brackets on each side of the ignition coil.

Step 7

Repair step

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Usa a 10 mm socket wrench to remove the bolt holding the ignition coil.
Use a 16 mm deep socket to loosen the spark plug inside the valve cover.
Extend your magnet to retrieve the spark plug.
The 10 mm bolt holding the ignition coil is longer than the other 10 mm bolts. This bolt can only fit the ignition coil.

Step 8

Repair step

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Replace the faulty spark plugs and ignition coils with new ones.