How to Replace the Ignition Coil in Cars

by Contributing Writer; Updated June 12, 2017

The Mercury car regardless of engine type, relies on a distributorless ignition system (DIS) to start the car. In a DIS, an ignition module contains the ignition coil rather than a distributor, which is why the part is also know as a ignition coil pack. From the ignition module, the Mercury car ignition coil generates the spark needed to trigger the spark plugs.

Under The Hood:

 How to Replace the Ignition Coil in a Chrysler Sebring

Determine whether you want to replace just the ignition coil or the entire distributor assembly, which houses the ignition coil(s). Chrysler recommends you replace the entire assembly, unless you have special training as a mechanic.

Access the distributor assembly. To do this, remove the bolt that holds the air inlet resonator to the intake manifold, air intake resonator, air cleaner cover and air inlet tube. Also, remove the PVC air hose, the hose clamp that connects to the throttle body and the ERG tube.

Disconnect the spark plug wires from the distributor cap. Take off the distributor cap. You need to use a screwdriver to loosen the screws that secure the cap in place.

Indicate the position for the rotor, and then remove it. You also need to remove the retainers for the harness connectors, the mounting hardware and the transmission dipstick. Gently remove any parts loosened when you remove the fasteners.

Pull the distributor from the engine and insert a new distributor.

Put the parts back together in the reverse order in which you disassembled the distributor assembly. With a Torque wrench, tighten the nuts on the mounting fasteners with 9 foot pounds of toque (13 Nm) and the bolts on the ERG tube to 95 inch pounds of torque (11 Nm).

Items you will need

  • Screwdriver

  • Distributor assembly with ignition coil

  • Torque wrench

 How to Replace the Ignition Coil in a Mazda6

Put your safety first. Mazda recommends you disconnect the negative battery cable and set your emergency brake any time you do work on your car.

Pop the hood and locate the plug hole plate. You need to remove it to access the Mazda6 ignition coil. You should be able to lift the plate off.

Determine whether you have a turbocharger on your engine. The 3.0L (Aj) and the Mazdaspeed6 engines both use a turbocharge, while the 2.3L (L3) engine doesn't. If you have a turbocharger equipped, take off the charge air cooler.

Disconnect the electrical connector from the Mazda6 ignition coil. You may need to release a lock by pressing down on a clip or squeezing the electrical connector.

Remove the damaged ignition coil and replace it with a universal or stock replacement ignition coil.

Reconnect the electrical connector and tighten the fasteners with a torque wrench to 54 inch pounds.

Put the plug hole plate back on and reconnect the battery.

Items you will need

  • Mazda6 ignition coil

  • Torque wrench

 How to Replace the Ignition Coil on a Lt1

Park the vehicle in a safe location and turn the engine off. Disconnect the negative battery cable to prevent electrical shock.

Locate the ignition coil you need to replace. On LT1 engines, the ignition coils are at the front part of the engine bay, directly in front of the valve covers.

Disconnect the four-terminal connection from the ignition coil setup. Label the ignition coil wires for their location and disconnect the wires.

Remove the retainer screw and the mounting bolt from the old ignition coil to detach the coil from the engine.

Prepare the new ignition coil module with the silicone grease. Dab a small amount on the mounting face of the coil and on the bracket where it will be attached.

Attach the new ignition coil assembly and tighten the bolt to 18 foot-pounds with the torque wrench. Tighten the screw mounting the ignition coil assembly.

Reattach the wires in their proper position, then reattach the four-terminal connection. Reconnect the negative battery cable.

Items you will need

  • Pliers

  • Socket wrench set

  • Screwdriver

  • Labels

  • Torque wrench

  • Replacement ignition coil

  • Silicone grease

 How to Replace the Ignition Coil in a Pontiac Grand Am

Replace the Ignition Coil in a 2.4L Engine

Take off the 11-pin IDI/ICM harness connector.

Separate the ignition coil module assembly from the engine.

Uncover the housing by removing the fasteners that secure the housing cover to the housing. You can remove these with a screwdriver, wrench or ratchet and socket set. Once you have the cover off, disconnect the coil harness connector, the Grand Am ignition coil, the contacts and the seals.

Install the new Grand Am ignition coil and replace the engine components.

Install a New Grand Am Ignition Coil in a 3.1L or 3.4L Engine

Label and disconnect the spark plug wires from the ignition coil.

Use a screwdriver to remove the screws that hold the ignition coil to the ignition control module. There should be two screws per ignition coil.

Pull out the old ignition coil and insert the new one.

Reassemble the parts, using the reverse order in which you dismantled them.

Items you will need

  • Screwdriver, wrench or ratchet and socket set

  • Grand Am ignition coil

  • Screwdriver

 How to Replace the Ignition Coil in a Dodge Caravan

Remove the Caravan Ignition Coil

Look under the hood for a distributor. The spark plug wires connect into the distributor cap. If you don't see a distributor, you may have a model with a distributorless ignition system.

Find the ignition coil. On a Dodge Caravan, the ignition coil is at the back of the intake manifold. Disconnect the negative battery cable to prevent injury while you work.

Determine whether you need to remove the windshield wiper/motor module assembly. This won't be necessary on all models.

Disengage the connector securing the wiring harness connector to the Dodge Caravan ignition coil. Then, disconnect the ignition wire from the ignition coil.

Use a socket set to remove the mounting bolts. There are upper and lower mounting bolts. Separate the ignition coil from the mounting bracket.

Install the New Ignition Coil

Insert the new ignition coil. Mount the Dodge Caravan ignition coil to the mounting bracket.

Attach the mounted assembly to the intake manifold. With a Torque wrench, tighten the fasteners securing the ignition coil to the mounting bracket with 96 inch pounds of torque (10 Nm).

Tighten the bolts that secure the intake manifold to the bracket with 115 inch pounds of torque (13 Nm).

Connect the wire harness and any other parts you removed, including the negative battery cable.

Items you will need

  • Socket set

  • Replacement ignition coil

  • Torque wrench

 How to Replace the Ignition Coil in a GMC Sierra

Remove the Sierra Ignition Coil

Prevent accidents by disconnecting the negative, or ground, cable from the battery. You may want to isolate it for added safety.

Use masking tape to tag the wiring connectors that attach to the ignition coil. The ignition coil is inside the distributor, which connects to the intake manifold, so you may need to remove the distributor cap to see the connections.

Disconnect the ignition coil mounting bracket, which holds the Sierra ignition coil, from the intake manifold. You'll need to undo the fasteners with a socket set, wrench or screwdriver.

Determine how you can release the ignition coil from the mounting bracket. Some brackets connect with rivets. If this is the case, you need to drill and punch out the rivets. You'll also need to replace the rivets with screws or another suitable type of fastener.

Release the ignition coil from the mounting bracket.

Install the New Ignition Coil

Insert the new Sierra ignition coil into the mounting system.

Secure the ignition coil in place by inserting screws or another type of fasteners into the mounting bracket holes, if you had to drill rivets. An ignition coil kit typically comes with mounting hardware, so you may want to consider buying a kit rather than just the part.

Reattach the mounting bracket to the intake manifold. Tighten the retainers until they feel snug--too much torque can strip the fasteners.

Reassemble the rest of the parts by reversing the removal process.

Items you will need

  • Masking tape

  • Socket set, wrench or screwdriver

  • Screws or fasteners

  • Sierra ignition coil

 How to Replace the Ignition Coil in a Subaru Outback

Disable the battery's ability to charge to prevent accidents. To do this, remove the negative cable from the battery terminal.

Gain access to the ignition coil. Depending on the type of engine you have in your Subaru Outback, you may need to remove the air intake assembly and the windshield washer tank. If you do remove the windshield washer tank, don't remove the washer tank hoses--this allows fluid to gush out.

Remove the mounting screws for the ignition coil with a screwdriver, and pull out the old or damaged one. You may need to disconnect the spark plug wires or the electrical connectors, if any attach directly to the Outback ignition coil.

Position the new ignition coil and create a tight seal. Failure to do so may create ignition problems.

Check any components you removed for damage, wear or tear. If you can see any, replace the component before you reassemble.

Replace the parts and reconnect the battery.

Items you will need

  • Screwdriver

  • Outback ignition coil

 How to Replace the Ignition Coil in a Jeep Grand Cherokee

Uninstall the Damaged Grand Cherokee Ignition Coil

Remove the negative battery cable from the battery terminal. For added safety, isolate the cable and set your emergency brake.

Locate which ignition coil you need to replace. Depending on the location, you may need to remove parts, like the throttle body air intake tube, in order to access the damaged ignition coil.

Release the ignition coil electrical connectors by pressing down on the on the release lock. As you press down, gently pull the connector away from the ignition coil.

Use compressed air to clean the base of the ignition coil.

Loosen and remove the nut that secures the ignition coil to the mounting stud. A small wrench or a socket set work well to do this.

Extract the ignition coil. To do this, gently pull up on the ignition coil. As you pull, slightly twist to break the seal between the cylinder head and the boot of the ignition coil.

Install a New Grand Cherokee Ignition Coil

Clean the top of the spark plug, using compressed air. You can also clean the o-ring for the ignition coil.

Insert the new ignition coil. You want to guide the coil base over the mounting stud.

Replace the mounting nut and tighten it. If you have a torque wrench, tighten to 70 inch pounds (8 Nm).

Snap the electrical connectors back in place.

Reinstall any other parts you removed during the unistall process.

Items you will need

  • Compressed air

  • Wrench or socket set

  • Grand Cherokee ignition coil

  • Torque wrench, optional

 How to Replace the Ignition Coil Pack in a Hyundai Sonata

Use safety precautions to prevent injuries. While there are several you can perform, the single most important one is to disconnect the negative battery terminal. This prevents accidental sparks, fires and electrocution.

Lift the hood and locate the ignition coil pack. If you have a 3.0L, V6 engine, look for the distributor.

Release the spark plug wires from the ignition coil pack. Pull gently on the boot rather than the wire itself to prevent damage to the wire or connectors. If you have a distributor, you may need to remove the cap, rotor and seal before you can access the Sonata ignition coil.

Remove the ignition coil pack. You may need to unfasten any retainers with a screwdriver or wrench. On a 3.0L, V6 engine you may need to unfasten the mounting bracket to release the Sonata ignition coil.

Install the new ignition coil pack. You want to reassemble the remaining parts by reversing the steps you took to disassemble them.

Items you will need

  • Screwdriver or wrench

  • Sonata ignition coil pack

 How to Replace the Ignition Coil in a Hyundai Santa Fe

Disconnect the battery. To do this, simply remove the negative battery cable from the terminal and isolate it.

Access the ignition coil back by removing the engine cover.

Find where the spark plug wires attach to the Santa Fe ignition coil. Remove both the wires. You may need to squeeze the boot of the wires or push down on a safety clip to remove them. Some people find it helpful to mark the spark plug wires with masking tape to identify which wire goes where.

Loosen the connectors that hold the ignition coil in place with a screwdriver or small wrench.

Pull out the ignition coil. You may need to twist slightly as you pull up to dislodge the ignition coil from the engine.

Insert a universal or a stock replacement Santa Fe ignition coil into the engine and mount it using the connectors.

Reattach the spark plug wires in the proper location and put the ignition coil back on.

Items you will need

  • Screwdriver or wrench

  • Masking tape, optional

  • Santa Fe ignition coil

 How to Replace the Ignition Coil in a Saturn Ion

Set the emergency brake and disconnect the negative battery cable, which connects to the negative terminal post, from the battery.

Take off the air induction resonator.

Release the electrical ignition (EI) module harness connector. With a small wrench or a socket set, remove the bolts for the upper and lower EI. Then pull out the EI module.

Remove the spark plug wires from the ignition coil tower. To do this, gently pry between the EI module and the black CPA. A flat head screwdriver works great to do this.

Rotate the Ion ignition coil as you pull upward to remove the old ignition coil.

Install the new Ion ignition coil. You need to ensure the boot makes a proper seal for the ignition coil to work correctly.

Put the parts back in their proper places and attach them. Tighten so the fasteners are snug.

Items you will need

  • Wrench

  • Flat head screwdriver

  • Ion ignition coil

 How to Replace the Ignition Coil in a VW Jetta

Remove the ground battery cable from the negative terminal battery post. This prevents sparks, which can cause an engine fire, when metal tools make contact with the engine. Also, set your emergency brake.

Determine which type engine you have. The 1.8L (AWD), 1.8L (Aww and Awp) and the 2.8L (Bdf) require slight variation in the replacement process.

Use a Phillips head screwdriver to remove the screws that hold the engine cover in place. Then lift off the cover.

Expose the Jetta ignition coil. On a 1.8L (AWD) engine, you need to remove the recirculating valve and the secondary air inlet valve and their mounting systems. For the 1.8L (Aww and Awp) engine, you take off the hex nut and vacuum reservoir. The 2.8L (Bdf) engine doesn't require the removal of additional components.

Unscrew the retainers securing the Jetta ignition coil.

Separate the old ignition coil from the cylinder head. On the 2.8L (Bdf) engine, use Puller T10095 to release the Jetta ignition coil. You may need to twist the ignition coil to break the seal between the parts.

Reassemble the components that you removed.

Items you will need

  • Phillips screwdriver

  • Jetta ignition coil

  • Puller 10095, for 2.8L (Bdf) engines

 How to Replace the Ignition Coil in a Mercury Cougar

Detach the negative battery cable from the terminal. You may want to set your emergency brake as well.

Find out what type of engine you have in your Mercury Cougar. If you have a 2.0L engine, you only need to remove the intake resonators from your car. On models with the 2.5L engine, you need to remove the ignition coil pack connector, disconnect the radio interference capacitor and remove the EGR vacuum regulator solenoid from the upper intake manifold.

Disconnect the ignition coil pack connector.

Squeeze the locking tabs on the spark plug wires, pull gently on them to detach them and move them out of the way. You may want to wrap masking tape around the wire and notate the proper location for the wire in regards to their connection points on the Cougar ignition coil pack.

Use a socket head to remove the mounting bolts that secure the ignition coil to the module. There should be four bolts.

Lift out the ignition coil and replace it with a universal or stock replacement Cougar ignition coil.

Fasten the new ignition coil into place and reattach the components that you previously removed.

 How to Replace the Ignition Coil in a Ford Mustang

Determine the type of ignition system on your Mustang. In 1989, Ford began to use both a distributor and distributorless ignition systems. In these later years, the 4.6L and 5.4L engines continue to use ignition coils rather than a coil pack.

Detach the ground cable for the battery to ensure safety. Also, disconnect the wires connecting to the ignition coil. If you have a condenser connector equipped, you need to disconnect it, too.

Use a socket set or a wrench to unfasten the bolts on the coil. On models later than 1989, you may need to gently twist the ignition coil to break the seal.

Replace the old Ford Mustang ignition coil with the new one. Verify the types of engines and the year the ignition coil fits. With a history as long as the Mustang's, you don't want to buy the wrong part.

Reverse the steps to reassemble the ignition system. Start the Ford Mustang to test that the repair was successful.

Items you will need

  • Socket set or wrench

  • Ignition coil

About the Author

This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us.