Q: How can I find out what exactly is happening in my misfire?

asked by on

I diagnosed my car and got a code P0301, it said my first cylinder had bad combustion, dolt know exactly what that means. I asked around and I was told that spark plugs are common failures, I changed them but didn't make a difference, anything else I can do?

My car has 250000 miles.
My car has a manual transmission.

Hello there. Misfires are a common problem with your 1997 Subaru Impreza as the vehicles ages. The most common failures are the spark plugs, coil, plug wires, fuel injectors, fuel pump, vacuum leaks, or an oxygen sensor. You have done well in replacing the spark plugs first as they are commonly the at fault component.

If you replaced the spark plugs and the fault is still present, the vehicle will need a proper diagnosis to determine what is causing the misfire. A qualified technician, such as one from YourMechanic, will be able to diagnose the misfire condition and proceed with any repairs required to resolve the issue.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. How can I find out what exactly is happening in my misfire?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car idles rough, gas smell - 1988 Mercedes Benz 560SL

Check to see if the air filter housing has been sealed properly and that the mass air sensor has not been damaged by dirty air getting by the air filter assembly. If it has, then replace the mass air sensor...

Q: Q: Check Engine Light is On.

The transmission light flashing 16 times may be a problem with the DC solenoid for lock up and the transmission defaults to AWD causing the jerking on turns. I recommend you get a qualified mechanic check and scan the vehicle's...

Q: Multiople Misfire at almost all cylinders all at once no warning with codes

If you have a multiple misfire, the camshaft tensioners would not be the first place I would look for trouble. I would first check for air leaks and then carefully check the fuel and ignition systems. Camshaft tensioners usually manifest...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.