Skip the auto shop - Our mechanics make house calls

Q: Car keeps burning out ignition coil, same spot, not spark plug.

asked by on

My truck keeps burning out ignition coils in the Sams place and I checked the spark plugs and that's not it.

My car has 25000 miles.
My car has an automatic transmission.

Hello There, I would suggest checking the ignition control module. The ignition control module functions in two modes; the start and run modes. When starting the engine, the ignition control module allows full battery voltage to be deployed to the coil. This ensures there is a hot enough spark to start a cold engine when the fuel mixture is rich and the battery is dragged down from the starter. Once the engine starts, the ignition control module switches to a "run" mode. The ignition control module then reduces the voltage to the ignition coil(s) as the charging system comes on line, allowing the voltage to reach as high as 14.5 volts. In this case, if the ignition control module fails to switch to "run" mode after the engine ignites, this can overload the ignition coils, thus causing them to burn up due to an over supply of voltage. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your ignition system.

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

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: Fuel pump 1977 Oldsmobile Cutlass

Hello - you are correct, there will not be an additional fuel pump in the gas tank, only the mechanical pump at the engine. Check first to see if the fuel pump is pulling fuel from the tank, and pushing...

Q: no power to fuel sending unit in tank

The fuel pump relay in the engine relay box powers the fuel pump to run, but the fuel pump relay is turned on and off by the engine control module on pin 19 brn/wt wire grounding the circuit. You will...

Q: Clicking sound trying to start car

Hello. The most common part of this problem is the starter not working properly. What happens is the starter solenoid is not engaging the starter when the key is turned, which would cause a clicking noise. The worst case scenario...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.