Introduction

This guide will show you how to replace the spark plugs in your VE / VF V6 Commodore. Whilst this guide is written for the LLT Engine, the process is very similar for LFX Models, however the intake manifold is plastic.

Tools / Parts Required

  • Spark Plug Socket
  • Socket Set
  • Torque Bar
  • Breaker Bar
  • Anti-Sieze
  • x6 Spark Plugs (1.1mm Gap)

Step 1

To access all six spark plugs, we need to loosen the intake manifold. This will require removal of attached components.

  • Unclip and remove the black insulating material
  • Disconnect the three PCV tubes. Push the tab across and pull outwards

Step 2

Unclip the purge solenoid from the intake manifold. It slides off towards the firewall.

Step 3

Unclip the throttle body loom and disconnect the intake pipe. Also unbolt the support bracket as circled.

Step 4

Remove the five long bolts located on top of the intake manifold. The bolt closest to the front is shorter than the rest. Keep this in mind when reinstalling.

Step 5

Next, remove the final bolt securing the manifold to the engine. You will need to unscrew this bolt entirely, however you will not be able to remove it from the manifold due to a lack of clearance.

(This picture has been borrowed from an LFX engine. The bolt however is identical)

Step 6

Raise the intake manifold and place an object underneath it to support it. This will provide enough clearance to access all the spark plugs.

Step 7

Unclip all looms from the ignition coils. Simply push the grey tab downwards, then press on the connector and disconnect.

Step 8

Unbolt the ignition coils and remove from the engine.

Step 9

Using a spark plug socket and breaker bar, gently remove the spark plugs from the engine.

Step 10

Install the new spark plugs by applying a light coating of anti-size and gently thread them into position by hand. Be very careful not to cross thread the plugs.

Tighten with a torque wrench to 20nm.

Reinstallation

With the spark plugs now replaced, reinstall all remaining components, ensuring all vent tubes are wiring looms are reconnected. Start the engine to ensure correct operation.

7 comments on “Changing V6 Spark Plugs

  1. Brett Ferguson says:

    Hello,

    I have a 2010 SV6, with 3.6 L SIDI LLT engine. I replaced all of the spark plugs yesterday without lifting the inlet plenum.
    The coil packs on cylinders 3 & 5 ( rear two on the driver’s side) are the only ones that come close to the plenum, but can still be easily removed. I did remove the bracket for the purge solenoid for easier access to number 3, but even that was not necessary.
    I believe it was necessary to remove the plenum on pre-SIDI engines (eg. LY7), because they had a larger plenum that the LLT and LFX.

    • Staff @ AutoInstruct says:

      Thanks for the feedback! We did find it much easier when the plenum was removed, however as you’ve described it can be done without.

  2. Mick tattoli says:

    Air con my my ve working perfectly. (Very cold). But now it only blows hot air. Why? I think it is electrical. But what?. Can you help. 2009 v6 series 1 sv6

  3. Richard says:

    Firstly, thanks for sharing this outstanding post. I’ve read so many amazing things about your post. Really it such an informative post. Seriously thank you for all this awesomeness!

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