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Infiniti Q45 Ignition Coil

Common Reasons for an Infiniti Q45 Ignition Coil Failure

Different components need to work together in order for your Infiniti Q45's engine to function and to reach its maximum performance. One of these essential components is the ignition coil, which is in charge of relaying power from the battery to the spark plugs. The spark plugs then ensure fuel combustion, which makes it possible for your car to run. So when you start to have problems with your ignition coil, be sure to act on them immediately. Because although your Infiniti Q45 ignition coil is built to last a long time, things can still go wrong, and your ignition coil might still fail. Here are some of the common issues that could lead to or are caused by ignition coil failure:


Stalling is particularly noticeable when the car is at idle. There are many likely reasons why it happens, and one of which could be faulty wires in the ignition coil. Test your ignition coil with a multimeter to be sure if it is really the root of the problem. You would have to disconnect the wirings attached to it, so you could measure its resistance level. There are two coils that comprise the ignition coil, and each has a different resistance level from the other. Usually, the secondary coil has a higher voltage because it consists of more windings. If the resistance level displayed on the multimeter does not reach the normal figures, you would have to replace your ignition coil.

Engine startup failure

A dead ignition coil is one of the most probable causes of engine failure. It is incapable of transporting current to the spark plugs, so the engine fails to start or suddenly stops. In this case, you could test the ignition coil with a multimeter or manually assess its condition. You only need to hold the spark plug wire using insulated pliers and then touch the threaded part of the spark plug to a good grounding spot in the engine. If a bright blue spark appears, your ignition coil is fine. Otherwise, it is clearly not working.


An overheated ignition coil is often caused by weakened insulating properties of the coil windings, the coil housing, and the coil tower. Because large amounts of current run through the ignition coil regularly, the insulation in the said components deteriorates over time and eventually causes overheating.

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  • How to Keep the Current in Your Infiniti Q45 Ignition Coil Flowing

    The performance of your Infiniti Q45 relies heavily on various components including the ignition coil. This part consists of two windings: the primary winding where the current flows and the secondary winding where high voltage is generated. This power is then transmitted to the spark plugs, which create the spark that will start off the engine. Normally, an ignition coil can last up to 60,000 kilometers and can even stretch up to 80,000 kilometers. And to avoid bigger problems in your engine or vehicle, here are some things you need to look out for when checking your Infiniti Q45 ignition coil:

    Inspect the ignition coil for mechanical damages.

    Usually, this kind of damage includes a worn-out seal, which fails to close completely and causes the oil to escape. This leak can eventually lead to serious insulation damages. If the seal is already beyond repair, you would have to replace it. But if it is only covered with dirt, you can simply clean it off using a carburetor cleaner and a lint-free cloth.

    Look out for rusty wiring.

    Make sure that the wires are still intact and free from rust. A coil is usually protected by a soft, iron shield, which is actually the part that is prone to corrosion. And when this part gets rusty, it swells up and causes the outer plastic cover of the coil to crack. If cracks are present, you would have to remove the plastic cover and the iron shield. Dispose them and clean the coil core.

    Regularly test your ignition coil.

    There are two ways to test your ignition coil-one is by using a spark tester and the other is by using an ohmmeter.

    • Spark tester
    • You can use an old spark plug that's gapped to 0.200" as a spark tester. Simply attach the spark tester to a good ground. If you notice a blue spark, the ignition is still good. But if a yellow spark appears, you would have to use an ohmmeter already.

    • Ohmmeter
    • Simply connect the ohmmeter to the primary winding and then to the secondary winding. If the readings do not fall within the range of the normal resistance level specified for each winding, then an ignition coil replacement would be necessary.