Why does ignition coil fail

That may lead you back to a ground or two that is dirty, corroded, or loose. I have got two cylinders misfiring and I replaced all spark plugs.

The problem exists. I then swap the coils on the faulty cylinder with the one on the good. The misfiring is on the same cylinder. So it seems not an issue of coil? What else should I check? Thanks a lot. Verify the plug gap is correct on the new spark plugs. You could try checking, cleaning, or replacing your fuel injectors as needed. Next I would do a compression test to see if you are losing compression somewhere in those two cylinders. If you are, a leak down test will tell you where.

Yes, a bad coil means that particular cylinder is not burning fuel, reducing engine power and causing a misfire. Excellently writen article! The choice of words are very relatable! I have a GMC Acadia with an code that says multiple cylinder misfire. I have already changed the spark plugs. Just ordered coil packs. Do you think the coil packs will fix the problem. Also there was water in 2 of the cylinders when I went to change the spark plugs. Took the water out.

Then the code showed up for the moss fire. I would figure out why there is water in the cylinders. Could it have been gasoline instead of water? I have a problem with my car Golf mk5 1. Have you scanned for codes? What happens if you press on the gas pedal right when you start it up? Table of Contents. There are many possible causes for an engine losing power when hot. I would replace them all at once if they are older and you are having an issue with one of them. My honda odyssey has check engine light p when I driving fast and i changed the spark plug, coil and injector but the problem continues Reply.

As spark plugs wear down, the gap in which each spark plug is fired is widened, meaning the coil needs to provide a higher voltage in order to bridge the gap. This additional strain on the ignition coil may cause voltage overload, leading to overheating and eventually failure. Vibrations can damage ignition coil windings and insulation, causing shorts or breaks in the secondary windings. Wear and tear is a common reason for ignition coils failing.

It causes degrading of the insulation between the primary and secondary coil windings and the primary coil. The reduction in insulation can cause the coil to overheat. Problems starting the vehicle Check the high tension leads HT Leads. Damaged or worn spark plugs If the spark plugs are worn out, it forces ignition coils to operate at a much higher output.

Vibrations Vibrations can damage ignition coil windings and insulation, causing shorts or breaks in the secondary windings. It is important to remember that many spark plugs come pre-gapped according to the applications that correspond to each spark plug part number.

In the event that there is a coil failure due to an excessive gap, the spark plug and ignition coil should be replaced. It is also recommended that the ECU driver is verified for proper operation. Moisture is another cause of ignition coil damage, coming from the most likely and unlikely of places. The most likely being an oil leak from the valve cover gasket. On many COP-style engines the spark plug and ignition coil are mounted into a tube that is a part of the valve cover.

Overtime the seal between the valve cover and that spark plug tube can fail, causing oil to leak in and fill up around the spark plug and ignition coil. This in turn can lead to spark plug and ignition coil failure.

Be sure to fix the root cause of the oil leak, so this problem does not reoccur with the new ignition parts installed. Water intrusion is an unlikely, and therefore, overlooked cause of ignition coil damage. The ratio of turns between the two sets of windings determines the coil's maximum output voltage.

When voltage from the vehicle's battery flows through the coil to the spark plug, it ignites the fuel mixture in each cylinder. Regardless of the type of ignition system, all coils are subjected to heat with the constant surge of power running through them.

Over time, this surge of voltage and the subsequent heat generated by the process can break down the insulation between the primary and secondary windings. When a coil-on-plug or coil pack begins to have issues, the performance of the engine will suffer due to the loss of spark in one or more cylinders.