![]() ![]() The codes may not pinpoint a specific part, but they should identify the cylinder or cylinders that are misfiring as well as other systems that aren’t functioning properly. To find the cause of a misfire, start with checking for trouble codes in the onboard diagnostics system with a scan tool. Fuel economy also is likely to suffer, and emissions might increase because unburned gasoline is exiting the engine. Misfires usually cause the check-engine light to illuminate. Related: Is Your Check-Engine Light On? 5 of the Most Common Causes Misfires can occur when an engine is cold or warm, and they can occur intermittently. At idle, the engine might vibrate more than usual and run unevenly. Signs that an engine Is misfiring include slower acceleration or shaking during acceleration the engine also might hesitate or briefly lose power. ![]() An engine misfire is when one or more cylinders doesn’t produce power, and there are several possible causes, from a fouled spark plug to a clogged fuel injector or faulty oxygen sensor. ![]()
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