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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!

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Old Wed, Feb-28-2007, 01:24:08 AM   #1
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Default DIY: E46 M3 Spark-Plugs with Pictures

Disclaimer: This is merely a reference, please do not attempt if you are not comfortable with doing work on your car

Car: 2002 BMW M3 (Build Date 11/01)

Parts Needed:

6 x Spark Plugs (I used Denso Iridium IXU24 5309 purchased from

Tools Needed:

Torx T30 (pictured above) - used to remove Micro-filter holder, definitely needed
Torque Wrench
5/8 Spark-Plug socket
1/4 Drive Ratchet
3/8 Drive Ratchet
10mm socket
1 or 2 3/8 drive extension (12" is probably not enough)

As this is the first time I attempted any DIY work on my car, I took a good mental picture of what the engine bay look like; this will hopefully prevent any confusion later. You can also take a photograph of it to have a real picture of it.

I started by removing the plastic piece that holds the electrical lines that go over the engine:

There are 4 plastic (read: easily breakable) that hold the cover to the microfilter holder:

Carefully pry those open and remove the wrapped electrical line from inside. Make sure nothing is still connected to the microfilter holder since we will be removing this

Next, undo the three spring-load screw/clips from the top of the microfilter holder.

You can now pull that piece forward exposing the actual micro-filter:

Remove the micro-filter (and replace if needed)

Once the micro-filter is out of the way, 4 T30 Torx screws are exposed:

Unscrew all 4 and gently pull on the Micro-filter holder to remove from car (might take a little bit of prying and maneuvering to actually remove)

Location of all 4 screws:

Next Remove the PCV line by pushing on the clips (red arrows) and pulling off of the engine

Also remove the oil cap

With the 10mm socket, un-screw the 6 nuts holding the plastic engine cover (note: be careful not to drop any)

When you have removed all 6, this is what you should have:

Carefully remove the plastic engine cover and place it to the side

Replace the Oil Cap to stop any unwanted dust or dirt from getting into the engine (I also replaced the PCV fitting but didn't push it down all the way)

Next, carefully remove the spark-plug wire loom which is being held in place by two clips. Push the two clips together and put the wire loom to the side (do not completely unravel, this is simply gives you more space to work)

Picture of the clip:

2017 BMW M2 Performance Edition
2004 Porsche GT3 - sold
2002 M3 Carbon Black - sold
2012 Ducati Streetfigher 848 - sold

Last edited by lax01; Wed, Feb-28-2007 at 01:19:08 PM.
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Discussing DIY: E46 M3 Spark-Plugs with Pictures in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)