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Ignition coil problems is an ignition system failure where a high-voltage transformer converts 12 volts into 30,000–45,000 volts by electromagnetic induction, ensuring proper spark delivery, cylinder combustion stability, and catalytic converter protection. In 15 years under the hood, roughly 70% of ignition coil failures trace back to heat soak above 220°F, oil intrusion from valve … Read more
If your car shudders, bucks, or threatens to stall the moment you turn the key—especially on a chilly morning—you’re dealing with a rough idle at startup. It’s one of the most common yet frustrating issues drivers face. Left unaddressed, it can lead to poor fuel economy, failed emissions tests, or even engine damage over time. … Read more
By a Master Tech with 15+ Years Under the Hood Quick Answer: A failing ignition coil causes rough idle, misfires, poor fuel economy, and a flashing check-engine light. Swap the suspect coil to a different cylinder—if the misfire follows the coil, you’ve found the culprit. Expect $80-$180 for a single OEM coil versus $400-$700 at … Read more
If you’ve ever felt your car shudder, lose power unexpectedly, or idle like it’s about to stall, you may be dealing with a classic—and potentially serious—automotive issue: an engine misfire. As an ASE-certified master technician with over 15 years of hands-on experience diagnosing everything from weekend project cars to daily commuters, I’ve seen misfires cause … Read more