How To Fix A Misfiring Subaru Engine

If your Subaru car is misfiring, it’s not a good situation. A misfire means that your engine isn’t running as efficiently as it should be: either there’s too much or too little fuel being injected into each cylinder, air is going into the wrong cylinders, or something is blocking the flow of exhaust gases out of the engine. The result of this reduced efficiency? In some cases, carbon buildup in the cylinders and oil burning (think black smoke) can occur. If you know what caused your misfire and how to fix it yourself—or at least narrow down what needs fixing—then you can save money and get back on the road faster!

Ignition System Faults

Ignition system faults are usually caused by a misfire. You can identify a misfire by looking at the engine temperature gauge and listening for an irregular idle or engine noise. A faulty spark plug or ignition coil could be the cause of this and should be checked for damage before removing them from the car engine.

If you’re having problems with your ignition system, it’s worth checking if your vehicle has any fault codes stored in its computer. If there are no fault codes stored, then you’ll need to start taking things apart until you find something that’s not working correctly!

Fuel Delivery and Airflow Problems

If the fuel delivery system is not working properly, the engine will misfire. Fuel delivery problems can be caused by a clogged fuel filter or fuel pump. If you have these things checked out and they are not the problem, then you need to look elsewhere for your solution.

Airflow problems can also cause an engine to misfire. Airflow issues include a clogged air filter or dirty throttle body that is restricting airflow into your engine bay. You should check these areas first if your car isn’t running right and has recently had an oil change

Compression Issues

Compression testing is the most important test you can perform on a car engine. If your compression is low, it means that there’s a problem with your engine. A compression test should be done before any other diagnostic tests because it will tell you whether there is any damage to your cylinder walls, or whether it’s just something minor like a bad spark plug or leaky valve cover gaskets. While some DIYers feel they do not need the help of a mechanic to perform this test, we recommend having one come out and give you their opinion on what steps need to be taken next. Below are instructions for performing the basic compression test yourself:

  • Disconnect the battery cables
  • Remove all spark plugs except one
  • Install said single spark plug into cylinder number 1 (the one closest to the front of the vehicle) using an anti-seize compound if necessary
  • Start the vehicle in neutral and let warm up for 5 minutes before turning off the engine again

Emission System Defects

A vehicle’s emission system can be a breeding ground for misfires. If the exhaust is leaking, it can cause carbon build-up in the cylinders and valves which leads to a misfire. This is an easy fix as long as you have access to a diagnostic tool such as an OBD II scanner and know how to use it.

If you don’t have access to these tools or lack experience with them, bring your car into the service center for diagnosis and repair.

Fix Your Engine Today

In this article, we’ve covered all of the most common problems that can cause a vehicle to misfire. If you’re having engine issues, it’s important to diagnose the problem as soon as possible so you can get back on the road and avoid costly repairs. Since there are many different causes of misfires in vehicles, it’s important to know what type of issue might be causing this issue so you can find an appropriate solution based on the root cause. If you need help with identifying or repairing engine issues, contact us today!