My engine misfires, how and why?

To understand fully what an engine misfire is we need to understand what it means. If the engine is running perfect and all of the cylinders are “firing” you could say there is no misfire. Once the air fuel ratio inside the combustion chamber in any of the cylinders gets interrupted, the engine will misfire. One cylinder can misfire or more than one cylinder can misfire depending on the situation.
The misfire can be caused by many factors such as poor maintenance. An efficient engine will keep running for over 200,000 miles with proper care. Lack of proper care can prematurely shorten an engine’s life and can be costly to repair.
Engine Misfires can be very difficult to diagnose. If the engine is misfiring, it can cause all sorts of problems and leave you guessing as to what is the root cause. When the engine misfires, you will lose power, your gas mileage will drop and the vehicle can even fail emissions. In fact, cylinder misfires are one of the most common causes of emission failures on cars nowadays. A specific cylinder can misfire or multiple cylinders can misfire. If the engine starts to misfire and the vehicle is newer than 1996, then the check engine light may come on or flash and the computer may store a diagnostic trouble code like P0300 or something along those lines. If the vehicle is built prior to 1996, the computer may not pick up on the misfire and may not light the check engine light.
When an engine misfires, you can check the fuel injector, spark plug, spark plug wire, fuel compression and distributor for any signs of malfunction.
Using a scan tool to locate the problem
A scan tool can help locate the problem of a misfire and make life much easier. It is able to pinpoint the problem as soon a scan tool is connected to the data link connector. Once the scan tool is connected to a data link connector, a code can be read. An example reading of an engine misfire: P0301 “Cylinder 1 Misfire Detected” or p0313 “Misfire detected low fuel level.”
By performing basic check, you can save hundreds of dollars. Among these scan tools, AllScanner VCX-PLUS is one of the best, it is the latest professional tester for Porsche, with powerful functions and full access. If you want to learn more about this tool, click the tool image below.