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BMW Spark Plugs Installation Guidelines
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Parts that would be needed
Spark Plugs (available at Bimmerzone.com)
Tools that would be needed
Spark Plug Socket 5/8th
Socket Extension around 6"
NOTE: This spark plug guide was based on the spark plug change on a BMW E46, therefore spark plug changes for other BMWs will differ a little.
Pop the hood and start removing the cabin filter as shown in the picture.
Remove the wiring housing (but leave the wires alone) by unclipping the piece
The picture above shows the wiring housing piece removed.
Now remove the 4 torx screws (T-30)
Once the torx screws are removed, pull out the cabin filter housing unit
Pry open the cover plates with a flat head screw driver
Now work on removing the nuts with your ratchet and 10mm socket, remember to remove the oil filter cap temporarily to remove the covers
Once the covers are removed, you will see all 6 ignition coils exposed
Here is another view of the coils
Pull the clip up (connection type may vary between models)
Disconnect the wiring from the ingition coil.
Pull out the ignition coil and use the spark plug socket (5/8) to remove the spark plug.
-And finally, the spark plug is removed, see how dirty and corroded it is?
-Replace all the spark plugs.
-Now re-insert the new spark plugs just how you removed them and torque them down to 18 ft/lb torque or 216 in/lb
-Re-assemble everything just how you removed it and wallah you have changed your spark plugs