Patching a Leaky Coil Pack

This coil pack actually arcs off to the support shown opposite the spark plug wire. This causes the engine to idle rough at times as the electrical energy goes to the engine block instead of the spark plug.

Time to fix this nuisance.

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Step 1: Removing the Coil Pack.

The 12 volt connector and outgoing spark plug wire both need to come off. The two 10mm bolts also are to be removed. The coil pack simply lifts off the spark plug tube.

Step 2: Servicing the Coil Pack.

I used a clean rag to remove the oil and grime from the silicone boot. Inside the boot there is a double coil and resistor. I stretched the springs a bit to ensure proper connection between the spark plug and the coil pack.

Step 3: Patching the Electrical Energy Leaks.

Using the all purpose silicone adhesive, I applied liberal amounts to the side prone to arcing and the inner lip of the boot. Silicone is a great electrical insulator and should work great to stop the arcing.

Step 4: Reinstallation and Completion!

Installing the coil pack was straightforward. Now there is silicone insulation against arcing. Starting the engine, it idled very smoothly and I'm very happy now!

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    5 Discussions


    3 years ago

    As a Master Mechanic, this should only be done as a temporary fix. If the housing has been comprised, moisture has been allowed into the coil and will cause degradation of the primary winding, leading to eventual failure.

    2 replies

    Reply 3 years ago

    Yes correct but I believe this particular coil pack has a leak on the high voltage boot. The coil pack is also epoxy Sealed so for this design, as stupid as it can be from Korea, should hold up for a couple more years.


    3 years ago

    Could you actually see marks on the coil where it was arcing from? Interesting fix. Not something I've ever had as an issue with myself but I'm sure I will eventually. Saves replacing the whole coil. Cheers for posting

    1 reply

    Reply 3 years ago

    Thank you. When I took off the boot I expected to see a tear or tracking but it just looked grimy. The easiest way to the find the arc is to puff a mist of water onto the coil pack while the engine is on. If there is leakage you will definitely see it!