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Jaguar S Type Ignition Coil

Jaguar S Type Ignition Coil Problems and Ways to Diagnose Them

No matter what type of coil is used in your Jaguar S Type, signs of ignition coil failure are the same. A problem in the ignition coil will cause a no-start situation or multiple engine misfires. If you don't want your day to be ruined by a vehicle that doesn't start due to a bad ignition coil, you should familiarize yourself with the signs of ignition coil problems and how to troubleshoot them.

Weak coil

A weak coil will lead to low spark intensity, which makes the combustion process inefficient, so the driver will experience a drop in power. This can be diagnosed by disconnecting the coil wire from the distributor cap and inserting a spark plug into the coil wire. The spark plug should be laid on a metal part of the engine, like the valve cover. Try to crank the engine and observe how the spark plug works. A hot blue spark means properly functioning coil; pale yellow spark indicates a weak coil.

Problem with high tension wire

The high-tension wire that connects your Jaguar S Type ignition coil to the distributor top pole can have high resistance. It can also become loose or become corroded at the connection points. This can lead to a weak-spark condition, causing your Jaguar to run at lower rpm and completely die out at higher speeds. Burnt or shorted-out high tension wire can also result in a no-start condition. To diagnose the problem, you can check the wire for high resistance using an ohm meter. Any resistance observed indicates high tension wire failure.

Overheating coil

This problem is caused by excessive spark gap. Spark plugs with large gaps will need extra voltage in order for the spark to jump from one electrode to another.

Total coil failure

As it is well known, a coil that has failed completely will result in a no-spark and no-run condition, to troubleshoot the problem, you need to disconnect one of the spark plug wires from the spark plug. In vehicles with coil-on-plug setting, you need to take off the two 10mm bolts and detach the coil from the plug. Insert a tester spark plug and lay it on a good ground of your engine. You should ask someone to start the engine, so you'd be able to observe the spark produced. No spark means the coil has totally failed and is now in need of replacement.

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  • Jaguar S Type Ignition Coil Maintenance: Things to Keep in Mind

    Since it is the heart of the ignition system, your Jaguar S Type ignition coil is made tough to be able to take power from the battery and send it to the spark plugs. If one of the ignition coils in your ride goes bad, your Jaguar's ability to start and run efficiently will surely be affected. You don't want this to happen, yes? So, you'd better take care of your ignition coil and provide it with the kind of maintenance it deserves.

    • Replace a damaged ignition coil housing right away.
    • A damaged ignition coil allows moisture to come in contact with the primary and secondary coil, which can lead to spark-over resistance. Water from heavy rain and faulty spray nozzles can get through a cracked or damaged housing and cause this kind of problem.
    • Keep the ignition module in tiptop condition.
    • A damaged ignition module can cause internal short circuits, which can lead to ignition coil overheating. At temperatures starting 150 degrees Celsius and above, the ignition coil will get an irreparable damage.
    • Good spark equals to good ignition, so take care of the spark plugs.
    • When servicing your spark plug, you can get rid of rust and dirt using a stiff brush. It is also important to make sure that the spark plug wires are working well; you can use a spark tester for that. If the spark plugs or wires display signs of serious damage, replace them immediately.
    • When servicing the ignition system, don't forget to clean the tip of the coil moulding.
    • Since it is covered in a rusty conducive substance, it is important to clean the coil moulding tip thoroughly at service times.
    • Replace faulty ignition cables right away.
    • If the ignition cables are damaged, the voltage supply won't be enough. It will also extend the ignition coil's charge time. Some devices in the control unit can be damaged, and this can ultimately lead to a defective ignition coil.
    • Regularly inspect the ignition coil for mechanical damage.
    • When performing routine maintenance on the ignition coil, carefully inspect it for mechanical defect, such as those that are caused by marten bites. Insulation damage formed by escaping oil is also another type of mechanical damage to watch for.