Ignition Coils
An ignition coil takes your battery's modest 12 volts and transforms it into the tens of thousands of volts needed to jump a spark plug gap and ignite fuel. When one fails, the cylinder it serves stops firing correctly, and the resulting misfire can shake the whole engine, waste fuel, and put your catalytic converter at risk. Conrad’s Tire Express & Total Car Care's ASE-Certified Technicians diagnose coil failures precisely rather than guessing, and you can schedule an appointment online today.
Since 1969, Conrad's has been a dependable resource for ignition system diagnostics across Ohio, Michigan, and Pennsylvania, with 50+ locations making it convenient to get a misfire sorted quickly.
How Ignition Coils Work
Most modern engines use a coil-on-plug design, where an individual coil sits directly above each spark plug rather than routing high voltage through long spark plug wires from a single distributor. This setup delivers a stronger, more consistent spark and makes pinpointing a failure much easier, since a misfire code typically identifies the exact cylinder involved.
Coils fail for a handful of predictable reasons: heat cycling over years of use, vibration, and electrical stress from worn spark plugs that demand a higher voltage to fire. That last point matters — neglecting spark plug replacement on schedule puts extra strain on coils and can shorten their working life considerably.
Our Ignition Coil Services
Misfire Diagnosis
We scan for stored fault codes to identify the affected cylinder, then test the coil itself — checking resistance and, when useful, swapping it to a different cylinder to confirm whether the fault follows the part.
Coil Replacement
Once a coil is confirmed faulty, we replace it with a quality part and clear the fault code, then verify the misfire is actually resolved with a test drive rather than assuming the job is done.
Spark Plug Evaluation
Since worn plugs are a common contributor to coil failure, we check plug condition whenever a coil issue comes up and recommend replacement together if the plugs are due.
Why This Service Matters
- A misfiring cylinder pushes unburned fuel into the exhaust, which can overheat and damage your catalytic converter quickly.
- Persistent misfires waste fuel and reduce overall engine performance even when the symptoms feel mild.
- Worn spark plugs accelerate coil wear, so addressing both together prevents a repeat visit down the road.
- Confirming the actual failed component before replacing it avoids spending money on parts that weren't the real problem.
- Catching and fixing a misfire early is dramatically less expensive than replacing a catalytic converter damaged by ignoring it.
What to Expect at Your Conrad’s Visit
At Conrad's, ignition coil diagnosis starts with reading fault codes and confirming the failure with targeted testing, not just swapping parts based on a hunch. Our ASE-Certified Technicians explain the findings clearly, and a Digital Vehicle Inspection rounds out your visit, so you know the broader condition of your vehicle. With 50+ locations across Ohio, Michigan, and Pennsylvania, financing available, and transparent warranty details, getting a misfire resolved is a straightforward process at Conrad's.
Schedule Your Service Today
A rough-running engine or a check engine light flagging a misfire deserves a real answer, not a guess. Schedule a diagnostic appointment online at any of Conrad's 50+ locations across Ohio, Michigan, and Pennsylvania, and let our ASE-Certified Technicians, serving the region since 1969, get your engine firing smoothly again.
A rough idle, a noticeable stumble during acceleration, and a check engine light with a specific cylinder misfire code are the most common signs. It often feels like the engine is shaking slightly at idle.
