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Engine-Codes – Mitsubishi – P0304 Mitsubishi

P0304 Mitsubishi Code - Cylinder 4 Misfire Condition

Quick Answer

The diagnostic trouble code P0304 for Mitsubishi vehicles indicates a misfire condition in cylinder 4 of the engine. Common causes include Faulty spark plug in cylinder 4, Failing ignition coil in cylinder 4, Clogged or malfunctioning fuel injector in cylinder 4. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0304 Mitsubishi indicates Cylinder 4 Misfire Condition.
Common causes
Common causes include Faulty spark plug in cylinder 4, Failing ignition coil in cylinder 4, Clogged or malfunctioning fuel injector in cylinder 4.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0304 Mitsubishi Description

The diagnostic trouble code P0304 for Mitsubishi vehicles indicates a misfire condition in cylinder 4 of the engine. A misfire occurs when the fuel-air mixture in the cylinder fails to ignite at the proper time, causing a disruption in the engine's combustion process. This can lead to a variety of performance issues, such as rough idling, loss of power, decreased fuel efficiency, and potentially even engine damage if left unresolved.

OBDII Code P0304 Mitsubishi - Cylinder 4 Misfire Condition
P0304 Mitsubishi Code - Cylinder 4 Misfire Condition

Common Causes of P0304 Mitsubishi

  1. Faulty spark plug in cylinder 4
  2. Failing ignition coil in cylinder 4
  3. Clogged or malfunctioning fuel injector in cylinder 4
  4. Vacuum leaks in the intake manifold affecting cylinder 4
  5. Low compression in cylinder 4 due to a leaking head gasket or damaged piston rings

Symptoms of P0304 Mitsubishi

  1. Rough idling or vibrations felt throughout the vehicle
  2. Loss of power or hesitation during acceleration
  3. Decreased fuel efficiency
  4. Check engine light illuminated on the dashboard

How to Fix P0304 Mitsubishi

  1. Diagnose the specific cause of the misfire by performing a comprehensive inspection of the ignition system, fuel system, and compression levels in cylinder 4.
  2. Replace the faulty spark plug in cylinder 4 and inspect the remaining spark plugs for wear and tear.
  3. Test the ignition coil in cylinder 4 and replace it if necessary.
  4. Clean or replace the fuel injector in cylinder 4 to ensure proper fuel delivery.
  5. Check for vacuum leaks in the intake manifold and repair any leaks found.

Cost to Fix P0304 Mitsubishi

The typical repair costs for addressing a cylinder 4 misfire condition can vary depending on the specific cause of the issue. On average, the cost of replacing a spark plug or ignition coil ranges from $50 to $200 per part, while cleaning or replacing a fuel injector can cost between $100 to $300. Labor costs at auto repair shops generally range from $80 to $150 per hour, and the total repair bill can range from $150 to $500 or more. It's advisable to consult with a trusted mechanic to get an accurate estimate based on the make and model of the vehicle and the extent of the repairs needed.

What does this mean?

Tech Notes for P0304 Mitsubishi

The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4. If the problem persists more tests needs to be done to diagnose problem, see "Possible Causes"

When is the Code Detected?

Engine Cylinder 4 is Misfiring.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0304 Mitsubishi Code

1. What are the common symptoms of OBDII code P0304 in a Mitsubishi indicating a Cylinder 4 misfire condition?

The common symptoms include rough idling, loss of power, engine vibration, and potentially increased fuel consumption.

2. What are the possible causes of a Cylinder 4 misfire in a Mitsubishi triggering the OBDII code P0304?

Potential causes can include faulty spark plugs or ignition coils, a clogged fuel injector, vacuum leaks, low compression in the cylinder, or issues with the engine's timing.

3. How can I diagnose the specific cause of the Cylinder 4 misfire code P0304 in my Mitsubishi?

You can start by inspecting and testing the spark plugs, ignition coils, fuel injector, compression in Cylinder 4, and checking for any vacuum leaks in the intake system.

4. Can driving with OBDII code P0304 indicating a Cylinder 4 misfire damage my Mitsubishi's engine?

Continuing to drive with a misfire can potentially cause damage to the catalytic converter, so it's best to address the issue promptly to prevent further problems.

5. Is it safe to continue driving my Mitsubishi with the check engine light on due to code P0304?

While the vehicle may still be operable with a misfire condition, it's recommended to have the issue addressed as soon as possible to prevent any potential damage and ensure optimal performance.

6. How much does it typically cost to repair a Cylinder 4 misfire condition causing the OBDII code P0304 in a Mitsubishi?

The cost of repair can vary depending on the specific cause of the misfire, but it may involve replacing spark plugs, ignition coils, a fuel injector, or performing more extensive engine diagnostics.

7. Can I reset the OBDII code P0304 related to a Cylinder 4 misfire in my Mitsubishi using a diagnostic scanner?

Resetting the code with a diagnostic scanner may temporarily clear the check engine light, but it will not fix the underlying issue causing the misfire. It's essential to diagnose and repair the problem to prevent the code from reoccurring.

8. Are there any maintenance tips to prevent Cylinder 4 misfires and OBDII code P0304 in my Mitsubishi?

Regularly scheduled maintenance such as replacing spark plugs, ignition coils, and fuel filters at recommended intervals can help prevent misfire issues. Also, using high-quality fuel and keeping up with engine tune-ups can aid in preventing cylinder misfires.

9. Will a Cylinder 4 misfire causing OBDII code P0304 affect my Mitsubishi's emissions and cause it to fail an emissions test?

Yes, a misfire can lead to increased emissions, potentially causing your Mitsubishi to fail an emissions test. It's crucial to address the misfire promptly to ensure your vehicle meets emission standards.

10. Can extreme weather conditions or altitude changes contribute to a Cylinder 4 misfire and trigger the OBDII code P0304 in my Mitsubishi?

Extreme weather conditions or altitude changes can impact engine performance and potentially lead to misfire issues. Ensuring your vehicle is properly maintained and tuned for specific conditions can help mitigate these issues.

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