Back to all

Low Power Mystery (Ignition Coil Service)

October 16, 2022

It's no fun when your vehicle just doesn't run the way it used to.   You may notice (especially in cold weather) the engine won't start easily or when it does start, it doesn't run smoothly. It may not have much power at all. You also may have had to stop at the gas station more often, a sign your fuel economy isn't what it used to be. 

There could be a few different things that cause those symptoms, but one culprit could be a bad ignition coil. The coil takes the voltage from your battery and multiplies it before that power is sent over to a spark plug. That allows the plug to fire off a good jolt of electricity that ignites the fuel in your cylinder and powers the engine. 

There's usually one ignition coil for each cylinder (or sometimes for a pair of cylinders). If only one of them is not pushing out enough electricity, it can cause big trouble with your engine performance.  Other signs of a bad ignition coil include engine backfire, an oil leak and your Check Engine light coming on.   When that light comes on and you have some of those other signs, you need to have your repair facility check things out fairly soon because you may be damaging your engine and wind up with a far more expensive repair.

A technician will check for a computer code to pinpoint which cylinder is having the problem.  Using other diagnostics, the technician can rule out other components that might be causing the engine to misfire.  Ignition coils usually last 100,000 miles/160,000 km, but other engine conditions can cause them to fail before then. 

Your service advisor may suggest getting all your coils replaced even though only one is malfunctioning. That's probably a good idea in a higher mileage vehicle since the other coils may be close to failure, too. It's also wise to do that if your vehicle's coils are located in a hard-to-reach spot so you likely won't have to spend the money for that labor again when another one fails.

South Side Garage
9117 S WALKER AVE
OKLAHOMA CITY, Oklahoma 73139
405-308-1514
http://www.thesouthsidegarage.com

More articles from Southside Garage

Don't Blow a Gasket! (Valve Cover Gasket Replacement)

August 25, 2025

When you head out to your vehicle after it's been parked and notice oil leaking underneath it, that's something to have looked at right away. Oil leaks mean your oil level is probably low and running a vehicle in that condition can lead to expensive repairs. While there are many reasons oil leak... More

The Turn Signal Mystery (Turn Signal Problems)

August 18, 2025

Some problems are easy to diagnose on a vehicle; others aren't. Figuring out what's wrong with a malfunctioning turn signal sometimes fits into both categories. By the way, if your tempted to just leave your broken blinker broken, remember you can get a ticket for not using them, not to mention... More

Not So Hot in OKLAHOMA CITY

August 11, 2025

When the weather turns cold, it's nice to crank up the furnace and enjoy the heat. But if your home's furnace doesn't work, it's not too comfortable. Same goes with your vehicle. When the heater's not working, things can get miserable. It could also signal some major problems, which we'll discuss... More