9 possible symptoms and indications of a faulty coil pack

Apr 7


Emily Sara

Emily Sara

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A malfunctioning coil pack has 9 possible symptoms and indications. If one or more of the symptoms described on this page apply to your vehicle, your coil pack is most likely faulty. Look for a car service near me garage and make an appointment with a specialist to diagnose and if necessary, repair your vehicle.


The coil pack is critical for starting and maintaining the vehicle's smooth operation. The spark plug in the engine requires a high voltage to produce a spark and start the combustion process. The coil pack is in charge of producing the required high voltage.

If this component fails,9 possible symptoms and indications of a faulty coil pack  Articles the engine will not start and your vehicle will not operate smoothly. Since a result, you must be aware of the signs of a malfunctioning coil pack, as any problem with the coil pack can cause engine performance issues.

What Is a Coil Pack?

Your vehicle will not work properly if there is a problem with the coil pack. The answer to the question of how to tell whether a coil pack is bad is to check for the common signs of a bad coil pack:

The car will not start

One of the signs of a bad coil pack is that the vehicle will not start. If you try to start your vehicle and it doesn't seem to start, the coil pack is most likely broken.Engine management light turns on - How do you know if the coil pack is faulty when the engine light illuminates? You should pay attention to the engine light! The engine light will generally flash on your display when you use car diagnostic equipment, and the engine code will be P0351. The simplest method for determining ignition coil pack symptoms is to scan the fault code. By glancing at the error number on the engine light, you can figure out what's wrong with the coil pack. Look for full car service near me online and leave the diagnosis and repair to the professionals.

The engine is misfiring

Engine misfiring is one of the signs of a damaged coil pack. When you try to start such a vehicle's engine, you'll hear coughing and spitting as the engine misfires. The vehicle's behaviour will include jerking and spitting when travelling at high speeds. A vehicle with a defective ignition coil will vibrate while stopped at a stop sign or light. Look for a vehicle service near me and talk to a technician about the symptoms, or better yet, schedule a thorough diagnostic check.

Rough idling of the engine

Rough idling of the engine is another sign of a faulty coil pack. When driving, your vehicle looks to be underpowered. When the coil pack breaks, rough idling occurs; consequently, you should replace it as soon as possible after discovering the problem.


In the early stages of ignition coil failure, your car's backfiring may disclose the symptoms of the problem. The vehicle backfires when the unused fuel in the engine's combustion chambers escapes out the exhaust pipe. It's likely that if this problem isn't detected and fixed, it'll cost a lot of money to fix. You'll observe black smoke pouring out of the exhaust pipe if your car is backfiring.

Exhaust smoke erupts

The exhaust smoke generated by the defective coil pack may also be noticed when the vehicle is running. The smoke does not come out in a continuous stream, but rather in spurts.

Oil Leaks

One of the most common hot ignition coil issues is oil leaks. Because they are unable to properly transport energy from the battery to the sparkplugs, faulty ignition coils overheat. Overheating causes oil leaks by rupturing engine pipes.

RPM drop during acceleration

If your coil pack is faulty, you may notice a drop in RPMs when accelerating. Simply gazing at the RPM gauge while driving can inform you. The check engine/engine management light flashes or comes on occasionally while driving.

Lower fuel economy

If your ignition coil isn't delivering enough energy to your car's spark plugs, it will have to burn more fuel and consume more fuel. The only way to keep the vehicle running is to burn the extra and leftover fuel. You may have a coil pack problem if your vehicle is obtaining much less fuel efficiency than usual.

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