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Always disconnect the negative terminal of your vehicle's battery before starting this repair. Since you will be working in the engine compartment with metal tools near a live positive terminal, failure to disconnect the battery could create a short circuit causing catastrophic damage to sensitive electronics.
Older engines have ignition coils with detachable connector rubber boots. If your engine has these, they will likely detach from the ignition coil when you pull. You will need to pull them out separately.Visually inspect the spark plug hole for debris or oil. If there is any, clean it before taking the spark plug out. Take extra caution, as any debris left might fall into the cylinder when the spark plug is removed. Section 1 - Prepare the Engine for Removing the Spark Plugs and Ignition Coils Preparing the engine so the N20 spark plugs and ignition coils can be accessed is a relatively easy procedure taking less than 15 minutes. Please note that it is important that the strut braces are loosened (step 9) to create enough space to get the upper partition out without breaking it.
Push the upper side of the spark plug into the 3/8″ rubber hose. Using a 3/8″ rubber hose as a hand tool, screw the sparks plug hand-tight into the cylinder head plug thread as far as it will go. Traces of engine oil on the ignition coil boot indicate a leaking valve cover (cam cover) gasket. As oil is very aggressive on silicon boot insulation, so cam cover seal must be renewed before reinstalling ignition coils.
Recommended BMW Spark Plug Replacement Interval
Spark plugs and ignition coils are one of the key engine components in your BMW. So you need to make sure that they are in good shape. Yet, it is possible to have problems with spark plugs before you reach this interval. This can be caused by poor-quality fuel, high oil consumption, or fuel injection system-related problems. Also, ignition coils can fail as a result of damage or deterioration. What size are BMW Spark Plugs?
Spark plug holes are deep and usually under an angle. Access to some parts of the engine can be limited. This means you can easily cross-thread the new spark plugs while installing them. To prevent this, use a rubber hose as a flexible tool that will allow you to install the spark plug safely. This way, the rubber hose will slip if the plug starts to cross-thread.
5. Apex Tool Group GearWrench Tools Magnetic Spark Plug Service Kit
The majority of BMW engines use spark plugs with M14 x 1.25 threads. The recommended tightening torque for most BMW spark plugs is 30Nm.