How to change an ignition coil [AUTODOC TUTORIAL]

How to change ignition coil on a car – replacement tutorial

Things you may need:

                      a new ignition coil
                    
                      a set of suitable tools
                    
                      torque wrench
                    
                      crow bar
                    
                      threadlocker
                    
                      electrical contact cleaner spray

Buy tools

The need for replacement is indicated by the following signs:

difficulty starting the engine
the engine running rough
engine power loss

1.

Shut down the engine, switch off the ignition and wait until the engine has cooled down completely
2.

If necessary, remove the engine cover

The main types of ignition coils:
Coil pack or single coil. This supplies high voltage current to the spark plugs of all cylinders or to the distributorPencil coils. Each of these is responsible for the operation of a particular cylinder's spark plug
3.

The coil pack is located on top of the engine
4.

The high voltage wires run from it to the spark plugs
5.

The component is usually located near the spark plugs
6.

Pry up and unclip the caps of the high voltage cables
7.

Draw the wires to different sides to prevent mixing them up when reinstalling
8.

To indicate the installation order of the high voltage wires, make marks on their caps

Be careful!
Incorrect connection of the wires causes the engine to malfunction or not start at all
9.

On some ignition coils, the terminals are factory-numbered to make installation easy
10.

Carefully examine the ignition coil connection specifics, design, and fasteners
11.

If there is a lock on the electrical connector, unclip it
12.

Unscrew the fasteners and remove the part
13.

Check the high voltage wires for damage and corrosion of the connectors
14.

Install a new ignition coil in the mounting seat
15.

Tighten the fasteners with a torque wrench to the manufacturer's recommended torque

AUTODOC recommends:
If necessary, clean and treat the ignition coil connector
16.

Attach the electrical connector of the ignition coil
17.

Connect the high voltage wires in the correct order
18.

Check that the installation is correct and then carry out a test engine start
19.

Remember to check that the spark plugs are in good condition and replace them if necessary

AUTODOC recommends:
Pencil coils are installed directly into the spark plug wellsThere is no need to change all the components; only the defective one needs to be replaced
20.

A special diagnostic tool might be required to identify a faulty ignition coil
21.

Look at the design of the parts and the type of fasteners
22.

If the electrical connector has a lock, release it
23.

Remove any additional fasteners
24.

Remove the ignition coil from its mounting seat
25.

Prepare a new ignition coil
26.

Inspect the spark plug well and clean it if necessary

Please note!
Failure of a pencil coil can cause damage to the spark plug
27.

Check the spark plug and replace it if necessary
28.

Check that there are no signs of corrosion on the connectors, and that the seals and the wiring harness are in good condition
29.

Install the new ignition coil in the mounting seat
30.

Make sure that the installation is correct and connect the wiring harness
31.

Carry out a test engine start
32.

When the job is complete, reinstall the engine cover