one ignition coil is a component of the vehicle"s ignition system. That converts 12V battery power into high voltage in bespeak to develop a spark in ~ a spark plug. The spark ignites the air/fuel mixture in the engine cylinders. Most modern-day cars have one ignition coil per cylinder. Typically, the coil is installed right over the spark plug, prefer in this Ford engine in the photo. This setup is called coil-on-plug. In part cars, ignition coils for every cylinders are combined into one coil pack. In enlarge cars with a distributor, a solitary coil is used for all cylinders. Check out this instance of a single ignition coil in a Volkswagen air-cooled engine.

Ignition coil problems

Ignition coils are usual to failure in countless cars. Symptom of a failed ignition coil encompass engine shaking, sputtering and also lack of power (misfiring). The inspect Engine light will flash continuously or continue to be ON solid on the dash. In cars through a single ignition coil or coil pack, a negative coil (or coil pack) can reason the engine no to start.


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one ignition coil is much more likely come fail if spark plugs haven"t been replaced for a long time. This is since an old spark plug has actually larger gap between the electrodes, and, together a result, greater electrical resistance. This adds stress, overload on the ignition coil.

have the right to you drive through a negative ignition coil?

A bad ignition coil often causes the engine to misfire. In some cars, driving through an engine the misfires can reason the catalytic converter come overheat and melt. Instead of the catalytic converter is expensive. We likewise know instances when a shorted ignition coil caused damage to the engine computer system (PCM). Some auto makers advise not to journey if your engine misfires; others recommend driving just in a really moderate fashion and have your vehicle checked the end as soon as possible. See the vehicle"s owner"s manual for details.

Ignition component safety and security precautions

an ignition coil produces exceptionally high voltage that is attention for her health. Anytime working v ignition components, follow the safety precaution discovered in the business manual for your car. We have actually posted several web links where you can gain subscription-based accessibility to the factory business manual in this article. The an initial step once inspecting or replacing an ignition coil is to disconnect the an adverse battery cable.

How a failure ignition coil is diagnosed

First, her mechanic will scan the engine computer system for trouble codes. The trouble code may suggest out which cylinder misfired or also which coil has failed. For example, the code P0301 way that the cylinder number one misfires. The code P0351 reads Ignition Coil "A" Circuit Primary/Secondary malfunction (cylinder 1). ~ that, one ignition coil should be inspected following the company manual procedure. Us posted several web links where friend can get subscription-based access to a organization manual at the bottom that this post.
Usually, one ignition coil inspection has measuring the resistance between particular ignition coil terminals. If the resistance is outside of specifications, the ignition coil should be replaced. occasionally to identify a failing ignition coil, mechanics swap the suspected poor coil through a known an excellent one indigenous a different cylinder, to see if the misfiring moves with the coil or continues to be at the exact same cylinder. Because that example, with the code P0302 (cylinder 2 misfire) a mechanic might swap the cylinder 2 and cylinder 3 ignition coils and also run the engine because that a short time. If the problem code transforms from P0302 to P0303 (cylinder 3 misfire), the ignition coil that was originally at the cylinder number 2 is bad. Ignition coils are also recommended to be replaced if they display cracks, traces of arcing or other damages that may cause it to brief out.

Ignition coil replacement


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On-plug ignition coil
A faulty ignition coil can not be repaired; it need to be replaced. In many cars through a 4-cylinder or inline-6 engine, instead of an ignition coil is a an easy and not very expensive task ($180-$380 because that one coil). In part V6 engines, to gain accessibility to behind ignition coils, an intake manifold need to be eliminated (e.g., Ford Edge, Ford escape V6, Nissan Murano, Toyota Camry V6). This involves much more labor and also costs more ($280-$500 for one behind coil). In instances like this, your mechanic may recommend instead of all three rear ignition coils as a preventative measure. Whenever one of the ignition coils fails, it"s likewise recommended replacing all spark plugs if they haven"t been replaced in a while. Brand-new spark plugs will aid ignition coils last longer.


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