Q: Ignition Coil 5 is bad

asked by on

My ignition coil #5 is bad I'm concerned that if I change #5 only, one of the other coils could go shortly there after. Wouldn't it be more cost effective to change all of the ignition coils at once to avoid revisiting the coil issue again.

Ignition coils can be a very tricky component to diagnose and there is virtually no way to tell when one may or may not fail without pulling one apart and doing extensive testing. Often times when they fail, it can happen over an extended period of time and will generally happen intermittently and randomly. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly The insulation develops small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect. It is a matter of personal preference as to whether or not you prefer to replace all of the coils at the same time. It may be beneficial to do so since it may be a bit more efficient from a labor standpoint, however replacing them all does not necessarily guarantee that one of them may not fail in the future. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle to properly diagnose your ignition system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Ignition Coil 5 is bad

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Jack

Hi Patel. Thanks for the question today. Unfortunately, we can't attach images to this platform. However, you can watch this video which is a 2004 Honda Odyssey (with similar jack points in 2010) to learn the safe places to lift...

Q: No spark with new ignition coil

You probably have a bad crankshaft sensor. If the computer does not read a signal from the crank sensor when trying to start the car, it does not send power to the fuel pump or ignition coil. A certified technician...

Q: Convertible top won't go down in a 2002 Mercedes-Benz CLK430

There are many electronics that go into the convertible top and if one of them isn't working properly the whole system could not work. Some examples of electrical problems that can cause this to occur are blown fuses or electrical...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...