If the engine is misfiring, it may be caused by a damaged wire (s) which connect the fuel injectors to the Powertrain Control Module (PCM). The damaged wire (s) can be repaired or the emission wire harness replaced. A misfire can result in a loss of engine performance and illumination of the Check Engine Light. 139 people reported this problem. Let the engine cleaner coat the intake valves. Reinstall the part to the top of the intake. Reinstall the part that you removed to access the valves. Let the car sit for a few hours and soak. Let the cleaner soak on the valves for a few hours before starting the engine up. Rev at 3,000 RPM in Park until the smoke clears. A misfire code can be triggered by anything that causes the cylinder not to fire, so a full diagnosis should be run to be 100% sure on what is causing the misfire. Another common engine misfire is Driving with a misfiring engine can be dangerous for several reasons. For starters, it can mess with your exhaust and turn it black. This is a hazard for both you and other drivers on the road. Alternatively, engine misfires can cause you to lose power since they damage the other parts of the engine. Engine sputter, also known as engine misfire, is a common issue that can occur in vehicles. It refers to the momentary hesitation or uneven running of an engine. When an engine sputter s , it may produce a series of coughs, splutters, or stutters, causing the vehicle to run unevenly. . Just like skinning a cat there are many ways to get the job done. Being a professional shop I will typically use the tools I have at hand to diagnose in the Check engine light came on, went off, then reappeared over the course of a week or two. Code scan came back as multiple misfires in cyls 2 and 3. 2010 Hyundai Santa Fe 83,000 mi, Visitor. occasional miss at idle. Hyundai Santa Fe Intermittant cylinder misfires - 27 reports. Learn about this problem, why it occurs, and how to fix it. 5 Repair or replace. The fourth step in troubleshooting engine misfires is to repair or replace the faulty or damaged components and clear the codes. You can use a wrench, a ratchet, a socket, a 2003 Cadillac DeVille 90,000 mi, Visitor. Car idles rough and check engine light is on and sometimes flashes. Worse when engine warms up but idles rough even when cold. Diagnostic check shows P0300 and 303 codes which indicates a misfiring in the #3 cylinder. I haven't troubleshot it any further. 2. Misfiring Engine. If an ignition coil is not working properly, your engine will likely misfire. A misfiring engine results in a jerking or sputtering feel when you are moving at normal speeds. When you stop, a misfire from a bad ignition coil may cause your vehicle to run roughly, vibrate or shake. 3.

how to fix engine misfire