You can perform a fuel injector resistance test to see if it has fried internally and you can find the tutorial here:. This happens when the fuel injector has reached its life's limit and fries internally. This can easy be tested and you can find the tutorial here:įuel System: If fuel is missing from any one cylinder, the vehicle will have a miss that will light up the check engine light with a misfire code. What usually happens is one or two towers of the coil pack stop creating spark. How To Test The Coil Pack (Ford 3.0L, 3.8L, 4.0L, 4.2L). This is something that can easily be tested and you can find the tutorial here:. What usually happens is one or two spark plug wires go bad and stop transmitting spark to the spark plug. 
An ignition system misfire is usually caused by: In my opinion, around 90% of the time, a fault in the ignition system is usually behind a misfire. Ignition System: Each engine cylinder needs spark to ignite the fuel and the ignition system is the one responsible for the production and delivery of said spark.
The misfire cause will lie in one of three areas and they are: Since the PCM doesn't tell you exactly what went wrong, it becomes important to know what are the common causes of a misfire condition. What the PCM doesn't tell you is what exactly has failed. Normally, the PCM (Powertrain Control Module = Fuel Injection Computer) will identify which cylinder is the one misfiring.
Smell of unburned gas exiting the tail pipe. Sometimes, even tho' the engine is suffering a bonafide misfire, no misfire codes are registered in the computer's memory and/or no check engine light (CEL) on. 
One or more misfire codes (P0300-P0308) will be stored in your pick up's PCM memory. The check engine light will be on to let you know that you're not imagining the engine is running rough or missing. When this happens, you'll notice some of the following consequences (symptoms): In plain English, a misfire condition, means that the engine in your Ford 3.0L, 3.8L vehicle is not running on all 6 cylinders. You can find this tutorial in Spanish here: Cómo Probar Fallas En Cilindro (Ford 3.0L, 3.8L) (at: ). What Tools Do I Need To Test The Misfire Code(s)?. What Tests Can I Perform To Find Out What's Causing The Misfire Code(s)/Condition?.
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