8 Ignition Coils For Jaguar XF XJ8 S-Type XJR Super XK8 Vanden Plas XK XKR 4.2L

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IGNITION COIL PROBLEM SIGNS

Be aware of the following issues. Each one could give you an indication that you’re having issues with your ignition coil. And if multiple problems occur at the same time, then whilst this will help you narrow down the cause, it’s also an indicator that you need to get the professionals in, pronto.

Stalling and Misfiring  

When the ignition coil is failing or experiencing problems, it often leads to pistons misfiring or simply not firing at all, as the charge is not delivered to ignite the petrol. If you’re noticing strange noises,accompanied by a poor response from the engine leading to jerks or vibration when idling, these can be tell-tale signs that the ignition coil is on its way out. In the worst case scenario this can lead to the car shutting down altogether, and stalling when you put your foot down on the gas.

Can’t Start the Car

If your car has only one ignition coil, then it may prevent the car from starting. If the battery is properly charged and all you seem to get when you try to turn the key or hit the button is a clicking sound, then you could be looking at a problematic ignition coil. If the spark plugs are not receiving the charge they need – then the engine will fail to fire up properly.

Less Miles to the Gallon

If your engine is not burning fuel properly, the engine will need more fuel to do the same amount of work, leading to decreased fuel efficiency. Additionally, when your ignition coil malfunctions, it can also create disparities in the oxygen sensor, sending the engine more fuel than is actually required. Be aware that putting this unspent fuel through your engine is also incredibly bad for the associated systems, and can cause damage to the catalytic convertor, which is often a very expensive part to replace.

Check Engine Light Illuminated on the Dash

Although the check engine light can alert you to a number of different problem situations – one of these could be a faulty or broken ignition coil. In such a situation, you have a couple of choices. Either get down to a mechanic who can perform an OBD-II check, or get a scanner so that you can check the codes yourself. Codes P0300 to P0312 indicate a misfiring, which could be the result of an ignition coil problem, whilst codes P0350 to P0362 are reserved on all systems to indicate ignition coil issues.

Backfiring

As we mentioned with the fuel economy problem, a faulty ignition coil will often lead to unspent fuel entering into the exhaust system. When this fuel comes into contact with the hot metal of the exhaust or catalytic convertor, it can instantly ignite and explode, creating a back-fire – a loud noise that booms out of the back of the car. Whether or not this is caused by an ignition coil problem, you should always get the issue investigated.

Oil Leak

The huge amounts of current and charge being transformed inside the ignition coil lead to heat dissipation. When the part is functioning normally, the oil usually helps get rid of this thermal energy. If the coil is broken however, this can lead to overheating, which will eventually crack the housing and the oil will start to leak out of the part.

Bad Spark Plugs

If you find that your spark plugs are faulty or worn out, then they can often draw more charge than is normally expected from the engine. This can often put too much strain on the ignition coil, damaging it over time. If you find you have spark plug problems, it’s definitely worth checking the ignition coil at the same time.