#Bad spark plug symptoms v8 code#

The first is to identify the misfiring cylinder. There are two parts to diagnosing bad spark plugs in your Mustang. This is because when your car’s engine turns slower, it is easier to detect. When a spark plug is misfiring, it is often most pronounced at idle speed. Since there are so many reasons that a vehicle can misfire, we recommend testing for trouble codes first. That would include a lack of fuel pressure, bad fuel injectors, or even a timing chain (or belt) that has jumped. There are also non-ignition-related circumstances that can cause your Ford Mustang to misfire. There are also coil packs and spark plug wires. The real question is, what is causing the misfire? There is more to your Mustang’s ignition system than just the plugs. All of the other symptoms are a result of the misfiring itself. Misfiring is the most common symptom of bad spark plugs. When you take your Mustang in for a tune-up due to decreased fuel economy, checking the spark plugs (and ignition system in general) is going to be one of the very first places a mechanic will look at. This leads to a decrease in fuel economy. The less efficient your engine’s combustion, the more fuel will be wasted. If you have one or more bad spark plugs, it’ll cause the acceleration of the Mustang to be weaker. The fewer cylinders that your engine has, the more that one cylinder not firing correctly will have.

If acceleration has diminished, it should be felt. For example, P0304 is for a misfire in cylinder 4.Īs you ask your Mustang for more power, the fuel and ignition systems respond.

P0301 through P0312- these trouble codes indicate that there is a misfire in one specific cylinder.

A random misfire means that a misfire is detected, but the ECM is not able to determine which cylinder it is coming from, or the misfire is occurring randomly.

#Bad spark plug symptoms v8 code#

P0300– this trouble code indicates that there is a random misfire.There are several misfire-related trouble codes. More often than not, your Mustang’s computer can detect bad spark plugs in your car. The check engine light is one of the most common symptoms of bad spark plugs. On the right is the same type of plug when it’s new. Bad coil packs will produce the same results and feel like bad plugs. It is also worth noting that the symptoms of bad spark plugs in your car will be almost the same as any other bad part in the ignition process. If you don’t have one, your local parts store will do this for you for free.

We always recommend using an OBDII scanner to pull your trouble codes if you have a check engine light on. There are a lot of potential symptoms related to foul spark plugs in your Mustang. The good news is that if you do need to replace your Mustang’s plugs, they are very affordable. Something that has changed about modern spark plugs is that many of them use iridium, don’t need to be gapped, and can last for 100k miles with little issue. In the Ford Mustang, they are positioned atop the combustion chamber and ignite the air-fuel mixture, initiating the engine’s power stroke. The fundamental design and function of spark plugs have remained broadly consistent over the past century. While a misfire is the symptom of bad spark plugs, bad spark plugs almost always indicate a problem with the engine (more on that in section 2). If any element of this trio is imbalanced, your Ford Mustang won’t run right (or at all). An engine functions as a pump, requiring a precise combination of fuel, air, and spark.