Q&A for How to Change an Ignition Coil

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Question

What size socket is used for changing a spark plug?

kyle sis

Community Answer

The most common spark plug size is 5/8" or 16mm. Next would be 9/16" and 14mm. Less common sizes would be 7/8", 13/16", 3/4" and 18mm.

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Question

What special tools are necessary to remove and replace the ignition coil?

Dominic Donabedian

Community Answer

If working on a vehicle with all coils easily exposed, you should not have to use any special tools. If working on a vehicle with a transverse-mounted V-engine, removing some additional components may be necessary. Some new vehicles may have a hex bolt or star bolt holding the coils in place. It is always a good idea to inspect your vehicle before starting any procedures.

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Question

In haste I disconnected the 4 leads on the single ignition coil. How do I reconnect the correct lead to the correct coil terminal?

Dan Rich

Community Answer

There is a sequence for the coils and leads. Follow each lead back to the source. It will typically have the number of the corresponding cylinder it goes to.

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Question

Why do I need to disconnect the cables from the coil before changing a coil pack, even if the battery is disconnected and the engine is not running?

Aurnerw

Community Answer

You need to remove the connector from the coil pack before removing the pack from the vehicle. Disconnecting the negative battery cable prevents any short circuit if the power terminal comes into contact with a ground source.

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Question

Will not disconnecting the battery damage the ignition coil?

Aziz .G.mogannam

Community Answer

Not disconnecting the battery can potentially damage the ignition coil, but it doesn't always lead to it burning out. The risk arises because working on the ignition system or electrical components with the battery connected can cause electrical surges or short circuits that may overheat or damage the ignition coil. Disconnecting the battery before working on the vehicle helps prevent these risks and protects the ignition system.

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Question

Can I fix it myself?

Kyle G

Community Answer

Yes, you can. The difficulty varies with the vehicle, but it is usually something you can do at home.

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Question

How do I replace the ignition coil and ignition switch at the back of the engine, specifically for a Toyota Avalon coil C (coil 3)?

John Faires

Community Answer

Begin by locating the coil, which is typically in the rear bank of the engine if you have a V6 (2GR-FE) engine. You may need to remove the intake manifold for access. Disconnect the battery's negative terminal to prevent electrical issues, remove the engine cover if applicable, unplug the coil connector, remove the coil mounting bolt with a socket wrench, and carefully extract the old coil. Install the new coil, secure it with the mounting bolt, reconnect the electrical connector, reassemble everything, and reconnect the battery. Finally, start the engine and check for smooth operation. For a visual guide, consider watching a step-by-step video on replacing ignition coils in a Toyota Avalon.

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Question

I installed a new ignition coil on a 1953 Ford Flathead 6V positive ground. The new coil has plus (+) and minus (-) markings. Which side connects to the distributor?

John Faires

Community Answer

In a 1953 Ford Flathead with a 6V positive ground system, the positive (+) terminal of the ignition coil should connect to the distributor, and the negative (-) terminal should connect to the ignition switch or power source. Proper wiring ensures optimal spark efficiency.

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