7 Symptoms of a Bad Ignition Coil and Replacement Cost

In this article, we are going to explain about information of ignition coil, so you will know the basic functions, bad symptoms, how to test, and also the average replacement cost. And here we are:

Basic Functions Of Ignition Coil

Ignition coils are known as compact electrical transformers. Their purpose is to take the low 12-volt current normally found in car batteries and convert it into a much higher voltage which is needed to ignite the fuel and start the engine. Each spark plug in a car has its own ignition coil. The coil is either physically connected to the spark plug with wires or it sits on top of the spark plug without using wires. The spark plug needs about 15,000 to 20,000 volts of electricity in order to form an electric spark that can ignite the fuel. If you don’t have strong ignition coils then it will result in weak fuel consumption or engine misfires.

Its important to note that a troublesome ignition coil can also be related to a low voltage or abnormally high voltage battery. This will also cause a range of other issues with the car and upgrading it to a new battery can see many issues go away. Check out some of ProCarReviews car battery recommendations in order to find one that is suitable for your car. Many batteries found in older cars can simply breakdown with age and if its not reading at least 12.65 Volts when fully charged, you know there are issues with the battery.

Bad Ignition Coil Symptoms

If a vehicle is behaving intermittently and is giving its driver some trouble in a smooth driving, then it could indicate that the ignition coil of that vehicle has gone bad. The symptoms may vary depending on the severity of the ignition coil failure. And here are some common symptoms of bad ignition coil:

1. Backfiring

The backfiring caused by your vehicle can indicate the symptoms of the ignition coil failure in its early stages. The backfiring occurs when the unused fuel in the combustion cylinders of the engine leave through the exhaust pipe. If this problem is left unaddressed, then it can result in the costly repairs which can unnecessary if not properly maintained. The backfiring problem can be detected by the emission of a black smoke through the exhaust pipe. The smell of gasoline in that smoke may also give away the ignition coil failure.

2. Fuel Economy

Another symptom for a faulty ignition coil is the affected fuel economy. If your vehicle is getting less mileage than it was before, then it could mean that the ignition coil failure has occurred.

3. Engine Misfiring

Engine misfiring will be seen in a vehicle whose ignition coils have failed. Trying to start the engine of such a vehicle will result in engine misfiring like coughing spluttering noise regularly. When driving at high speeds, jerking and spitting will be seen in the behavior of that vehicle. A vehicle with a failed ignition coil will also result its vibration when it is idling at a stop sign.

4. Vehicle Stalling

The ignition coil failure will also result in the stalling of that vehicle. This will occur because of the irregular sparks sent to the spark plugs by the faulty ignition coil. The vehicle may shut off completely when brought to stop leaving you with the trouble to restart it.

5. Engine Jerking, Rough idling, Poor Power

Another symptom is engine rough idling, jerking and hesitate even at accelerate, and you will feel poor power when you drive the car.

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12 thoughts on “7 Symptoms of a Bad Ignition Coil and Replacement Cost

  1. Car vibration when driving at 60 or above had new tires put on new brack put on had front check out and it’s all good could it be the time it self

    Reply
  2. I have a 2009 Hindi accent 4 cylinder which has just stared vibrating while driving and idling which gets better when excellerating and engine light stays on
    Need some imfo so when I take it in I am better equip to deal with repair man. Thank you deedra

    Reply
  3. I have a 2001 Chevy Lumina, after so many miles it kinda chugs, or kinda makes the car jerk really bad, I thought it was getting hot pretty quick, I changed plugs, changed fuel filter, cleaned out radiator, and everything, it doesn’t make sense why it keeps doing it

    Reply
  4. My BMW E39 520i would rumble everytime I started him up in the morning. I took it to a mechanic and been advised that 6 coils need replaced, (6 of them thats a coincidence isn’t it)…I got quoted $1680 to replace them incl labour and gst (NZ goods n services tax).

    I went online after that chat with the mechanic and looked around for BMW ignition coils, pkt of 6 would cost -wait for it $344…am i getting ripped off? or am i looking at the wrong product?

    I dont have alot of spare cash for repairing this car so im stressing a lot about it, and just want a driveable car.

    Reply
  5. Hi there…My BMW E39 520i would rumble everytime I started him up in the morning. I took it to a mechanic and been advised that 6 coils need replaced, (6 of them thats a coincidence isn’t it)…I got quoted $1680 to replace them incl labour and gst (NZ goods n services tax).

    I went online after that chat with the mechanic and looked around for BMW ignition coils, pkt of 6 would cost -wait for it $344…am i getting ripped off? or am i looking at the wrong product?

    I dont have alot of spare cash for repairing this car so im stressing a lot about it, and just want a driveable car.

    Reply
  6. ALSO NOTE ON THE COST, SOME CARS HAVE MORE THAN ONE COIL, SUCH AS ONE FOR EACH SPARK PLUG, SO FOR INSTANCE ONE COIL CAN RANGE FROM $50-120 AND THEN ADD LABOR COST. TO REPLACE SIX COILS IS JUST UNDER AN HOUR OF LABOR.

    Reply
  7. Also important to note regarding cost, some cars have 6 coils, one for each spark plug, so you are looking at 6 times the cost of the plug plus labor.

    Reply

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