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.
- Spark Plug Socket
- Socket Set
- Torque Bar
- Breaker Bar
- x6 Spark Plugs (1.1mm Gap)
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
Unclip the purge solenoid from the intake manifold. It slides off towards the firewall.
Unclip the throttle body loom and disconnect the intake pipe. Also unbolt the support bracket as circled.
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.
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)
Raise the intake manifold and place an object underneath it to support it. This will provide enough clearance to access all the spark plugs.
Unclip all looms from the ignition coils. Simply push the grey tab downwards, then press on the connector and disconnect.
Unbolt the ignition coils and remove from the engine.
Using a spark plug socket and breaker bar, gently remove the spark plugs from the engine.
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.