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Spark Plug and Coil Replacement
 
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Pelican Technical Article:

Spark Plug and Coil Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$100 to $400

Talent:

**

Tools:

E8 Torx, 14mm 12 point thin wall extra-long socket, extensions and universal joints

Applicable Models:

BMW 320i Sedan (2013-16)
BMW 320i xDrive Sedan (2013-16)
BMW 328i Sedan (2012-16)
BMW 328i xDrive Sedan (2013-16)
BMW 330e Sedan (2016)
BMW 335i Sedan (2012-15)
BMW 335i xDrive Sedan (2013-15)
BMW 340i Sedan (2016)
BMW 340i xDrive Sedan (2016)
BMW ActiveHybrid 3 Sedan (2013-15)

Parts Required:

Spark plugs, coils if needed

Hot Tip:

Work on a cold engine

Performance Gain:

Better mileage

Complementary Modification:

New air filters

Replacing the spark plugs on your BMW C340 is recommended routine maintenance though be it at much longer intervals than before. With all the major engine design changes over the years, spark plugs now last up to three times as long as they did in years past. This is good and bad. It means you save money and time not having to service them so frequently, but run the risk of a spark plug seizing in the cylinder head. I suggest replacing your spark plugs every three years regardless of mileage. If you do not know the last time the plugs in your motor were changed replace them right away. I do NOT recommend putting anti seize on the plugs, the outer threaded part of the plug is used as a ground and anti-seize can affect the ground connection.

There is no traditional distributor cap and wires on newer cars including the F30. The engine uses a coil over system of a single coil directly over each plug. This makes it much easier to track down problems with the coils by simply switching a troublesome coil with a known good coil to determine if it is bad. This will allow you to buy a single coil and not have to replace all six.

It is a very good idea to change the plugs when the engine is cold. If the engine is hot or warm the threads in the head are much more susceptible to damage from stripping or cross threading.

The plugs and coils are located on the top right side of the motor (red arrow) under the engine cover.
Figure 1

The plugs and coils are located on the top right side of the motor (red arrow) under the engine cover.

The engine cover is held in place by four rubber grommets under the cover that sit in four plastic nubs on the top of the engine.
Figure 2

The engine cover is held in place by four rubber grommets under the cover that sit in four plastic nubs on the top of the engine. Grab the cover by the edges on one side and wiggle and lift it off.

Figure 3

With the cover off you can see the six coils on the top of the engine (red arrows), the plugs are underneath the coils

You will need to move the insulation out of the way to access coil and plug number six; you may also need a universal joint to remove the plug depending on the length of your extension.
Figure 4

You will need to move the insulation out of the way to access coil and plug number six; you may also need a universal joint to remove the plug depending on the length of your extension.

Begin by separating the wiring connection from the top of the coil by gently prying up the grey plastic piece (red arrow) and then squeezing the grey tap and pulling it straight off.
Figure 5

Begin by separating the wiring connection from the top of the coil by gently prying up the grey plastic piece (red arrow) and then squeezing the grey tap and pulling it straight off.

There is a single E8 Torx that holds each coil in place (red arrow) Use an E8 socket and remove the bolt.
Figure 6

There is a single E8 Torx that holds each coil in place (red arrow) Use an E8 socket and remove the bolt.

With the bolt removed pull the coil straight up and off the coil.
Figure 7

With the bolt removed pull the coil straight up and off the coil. There can be a little suction between the coil and plug when they are separating but this is normal. One other thing you may want to consider is putting a small amount of dielectric grease on the ends of the coil pack where it attaches to the spark plug.

The plug is directly below the coil (red arrow) and it is a tight work space that requires a special socket.
Figure 8

The plug is directly below the coil (red arrow) and it is a tight work space that requires a special socket.

You will need a 12 point thin wall extra-long socket, extensions and maybe a universal joint to remove the plugs.
Figure 9

You will need a 12 point thin wall extra-long socket, extensions and maybe a universal joint to remove the plugs. The plugs are long and twelve point and the work space is narrow so a regular socket will not work

Always check the condition of your plugs when replacing them; you can learn a lot from them.
Figure 10

Always check the condition of your plugs when replacing them; you can learn a lot from them. They should look like they have ash on them; worn or burnt components, oil or dark deposits are all signs of trouble and an unhealthy motor. Installation is the reverse of removal



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Page last updated: Tue 2/21/2017 03:13:58 AM