Skip the auto shop - Our mechanics make house calls

Q: Ignition coil pack is not firing (1 out of 3)

asked by on

I had the ignition module tested more than once to be sure and it was good cOil pack in the middle which is 2/5 is not firing at all ! With new wires! Could it be the spark plugs? It happened 1 day with no warning!

My car has 233000 miles.
My car has an automatic transmission.

It is not uncommon for an ignition coil to fail. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts much quicker than the insulation. The insulation can develop small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings which in turn decreases the coil’s ability to function. I would recommend having an expert from YourMechanic come to your location to inspect the misfiring problem in person and perform any needed repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: The car won't run for longer than 30 sec.

When the car will only run with the choke applied, this suggests there is a larger fuel delivery problem. Start by checking the fuel lines, filter, etc., to be sure they are all free of dirt or any kind...

Q: Check Engine Light with codes P219B and P0305

Hi there. The first code denotes an air fuel mixture ratio concern; and the second code, P0305, is a misfire detected on cylinder 5. There are several possible causes and both codes could be a related fault. An ignition coil,...

Q: Pulsing sound coming from engine of 98 buick century ?

Hello, thank you for writing in. The vehicle may be stalling once in gear for several reasons. To start, check the level and condition of your transmission fluid. Low or dirty fluid will cause issues with the pressure, and can...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...