Karlyn STI® - Direct Ignition Coil

11 reviews|Item # sp3406
$13.22 - $111.59
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Product Details

Direct Ignition Coil by Karlyn STI®. The ignition coil is one of the most important part in the ignition system. Ignition Coil aimed to provide the needed high voltage and ignition energy for generating the high voltage sparks at the spark plug.

Karlyn STI


  • Place directly on the spark plug
  • High temperature resistant
  • Made of High Quality Materials

Karlyn STI® is recognized worldwide as one of the most proven and reliable manufacturers of ignition and suspension parts in the automotive aftermarket. The brand's history traces back to 1971 when German engineer Hans Bierdumpfel founded Karlyn STI, after working on leading positions in several respected companies in the USA. At first the company produced VW ball joints and tie rod ends, and further expanded into manufacturing suspension parts and high-performance spark plug ignition cable sets for a range of vehicle applications. Today, Karlyn STI product lines are admired by automotive fans for their unmatched performance and superior durability.


A Spark Transfer International (STI) Coil on Plug (COP) Warranty and Diagnosis

Karlyn Industries/STI distributes high-quality COP components. The manufacturer utilizes independent engineers to monitor their coils and test warranties. Most coils that are returned DO NOT have a problem. Rough running engines that set misfire codes can have multiple causes. It is the responsibility of the dealer/installer of Karlyn STI products to verify that the following items of inspection have been performed, in order to comply with warranty replacement.

General misfire codes are most likely due to an intake vacuum leak or fuel delivery problem. Misfire codes identifying a particular cylinder are usually due to a fouled spark plug, dirty or dead fuel injector or loss of compression in the cylinder (burned or bent valve, weak or broken valve spring, or leaky head gasket.)

If the crankshaft position sensor fails, the loss of the basic timing signal will prevent the system from generating a spark and the engine will not start or run. A failed driver circuit within the powertrain control module (PCM) can kill an individual coil and prevent that cylinder from firing. Replacing the coil without addressing the cause will only result in another damaged coil.

Misfire codes can also be triggered from a damaged wire harness due to poor grounds. Inspect the wire harness carefully. You may have to cut back the insulation to verify that there is no corrosion or melting of the wire harness due to poor grounds.

A faulty harness can cause the coil to fail. If you simply install a new COP, it may seem like you have corrected the problem but, merely replacing the coil without repairing the grounding problem may result in future coil failures. In summary, it is important to remember that ignition misfire can also be caused by other factors such as worn or fouled spark plugs, loose or damaged coil connectors or terminals, dirty fuel injectors, low fuel pressure, intake vacuum leaks, loss of compression in a cylinder, even a tank full of "bad" gas contaminated with water. These other possibilities should all be ruled out before a COP unit is replaced.

Note: A fouled spark plug can damage the COP. Karlyn STI recommends that you always replace the spark plugs when you replace the COP units & that all the ignition coils be replaced at the same time. As a form of preventive maintenance, the manufacturer suggests this be done every 60,000 miles. Karlyn STI warrants their coils to be free from factory defects for the period of 12 months or 12,000 miles.

The main goal here is a real solution to your ignition problem which will result in happy customers. Temporary solutions will only result in the return of non-defective parts and in unhappy customers who will continue to have the same problem.

Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More



Every Customer can leave a review about our service and the product that was purchased. In order to leave your review for your new product, please follow the link in the email you receive after completing your purchase. You can rate appearance, ease of installation, price/value and product quality.

Karlyn STI® - Direct Ignition Coil
Karlyn STI® - Direct Ignition Coil
Average Rating: 4.8 of 5
4.8 of 5
Great Coil
Close to or better than OEM, highly recommend this product.
Posted by (New Haven, CT) / 2006 Land Rover Range Rover
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4 of 5
Just installed but working very well. Restored performance and gas mileage.
Posted by (Easton, MD) / 2009 Chevy Traverse
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5 of 5
Quality Parts And Exceptional Price
Product looks exactly, the way they were pictured very happy with the quality and product exceptional price.
Posted by (Newark, DE) / 1996 Toyota Avalon
Was this review helpful for you? Yes
5 of 5
Quality Product
The replacement coils by Karlyn were easy to install, since I was warned they require also direct ignition coil of the same brand to be installed. Everything came in time and in one package. Thank you for your splendid customer service! It was a pleasure to deal with this company.
Posted by (Spring Hill, FL) / 2006 Ford E-series
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5 of 5
Ignition Coil
Good quality and fast delivery. The product arrived the same as described. The best replacement for the money!
Posted by (Amesbury, MA) / 2000 Ford E-series
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5 of 5
Posted by (Lexington, KY) / 1999 Mazda Protege
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5 of 5
Satisfied Mother
I ordered ignition coils and spark plugs for my Son-In-Law to install for me. The shipping process was very simple and accommodating for my busy work schedule. The quality of each product was much more than I expected. He had my car up and running like new by lunch time. Thanks CARiD, you are the best and most timely company I have seen in a long time.
Posted by (Coram, NY) / 2009 Toyota Corolla
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5 of 5
Good Value For the Money.
The coils look very sturdy and well built. Considering the price difference between the MINI equivalent component, these seem like they should cost more. They have been great so far with 2+ weeks on the job. I drive my 2011 MINI Cooper S pretty hard and these have been able to keep up without a hitch.
Posted by (Des Plaines, IL) / 2011 Mini Cooper
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5 of 5
Ignition Coil
Looked just like the pictures. Made quiet the difference in replacing my old coils. Idles way better.
Posted by (Muldrow, OK) / 2002 Mitsubishi Galant
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4.5 of 5
Ignition coils.
Ordered 2!
Posted by (Baltimore, MD) / 2003 BMW X5
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