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Engine-Codes – Suzuki – P0304 Suzuki

P0304 Suzuki Code - Cylinder 4 Misfire Detected

Quick Answer

When a P0304 Suzuki diagnostic trouble code is triggered, it means that the engine control module (ECM) has detected a misfire in cylinder 4. Common causes include Faulty spark plug: A worn or fouled spark plug can cause a misfire in cylinder 4, Bad ignition coil: A malfunctioning ignition coil can lead to a weak spark, resulting in a misfire, Clogged fuel injector: A clogged or dirty fuel injector may not deliver the proper amount of fuel to the cylinder. 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 Suzuki indicates Cylinder 4 Misfire Detected.
Common causes
Common causes include Faulty spark plug: A worn or fouled spark plug can cause a misfire in cylinder 4, Bad ignition coil: A malfunctioning ignition coil can lead to a weak spark, resulting in a misfire, Clogged fuel injector: A clogged or dirty fuel injector may not deliver the proper amount of fuel to the cylinder.
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 Suzuki Description

When a P0304 Suzuki diagnostic trouble code is triggered, it means that the engine control module (ECM) has detected a misfire in cylinder 4. A misfire occurs when fuel in the combustion chamber fails to ignite properly, causing a disruption in the engine's normal operation. This can lead to a rough idle, decreased fuel efficiency, loss of power, and potentially engine damage if left untreated.

OBDII Code P0304 Suzuki - Cylinder 4 Misfire Detected
P0304 Suzuki Code - Cylinder 4 Misfire Detected

Common Causes of P0304 Suzuki

  1. Faulty spark plug: A worn or fouled spark plug can cause a misfire in cylinder 4.
  2. Bad ignition coil: A malfunctioning ignition coil can lead to a weak spark, resulting in a misfire.
  3. Clogged fuel injector: A clogged or dirty fuel injector may not deliver the proper amount of fuel to the cylinder.
  4. Vacuum leak: An intake or vacuum leak can disrupt the air-fuel mixture, leading to a misfire.
  5. Low compression: Low compression in cylinder 4 can prevent proper combustion, resulting in a misfire.

Symptoms of P0304 Suzuki

  1. Rough idle: The engine may shake or vibrate at idle due to the misfire in cylinder 4.
  2. Loss of power: The vehicle may feel sluggish or have difficulty accelerating.
  3. Engine misfiring: The engine may sputter or hesitate during acceleration.
  4. Increased fuel consumption: A misfire can lead to inefficient combustion, resulting in higher fuel consumption.
  5. Check Engine Light: The ECM will illuminate the Check Engine Light to alert the driver to the issue.

How to Fix P0304 Suzuki

  1. Inspect spark plug: Check the condition of the spark plug in cylinder 4 and replace if necessary.
  2. Test ignition coil: Test the ignition coil for proper function and replace if faulty.
  3. Clean or replace fuel injector: Clean or replace the fuel injector for cylinder 4 to ensure proper fuel delivery.
  4. Check for vacuum leaks: Inspect the intake system for any leaks and repair as needed.
  5. Perform compression test: Check the compression in cylinder 4 to determine if low compression is causing the misfire.

Cost to Fix P0304 Suzuki

The cost of repairing a P0304 Suzuki diagnostic trouble code can vary depending on the specific cause of the misfire and the labor rates in your area. In general, replacing a spark plug or ignition coil can cost between $50 to $200 per part, while cleaning or replacing a fuel injector may range from $100 to $500. Diagnostic testing and labor costs can add another $100 to $300 to the total repair bill. Overall, you can expect to pay anywhere from $200 to $1000 for resolving a cylinder 4 misfire issue. It's recommended to get a detailed estimate from a qualified mechanic to get a more accurate cost estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0304 Suzuki

The P0304 code means that 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 need to be done to diagnose the problem, see "Possible Causes".

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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 Suzuki Code

1. What does the OBDII code P0304 mean on a Suzuki?

P0304 indicates that the engine control module (ECM) has detected a misfire in cylinder 4.

2. What are common symptoms of a P0304 code in a Suzuki?

Symptoms can include rough idling, reduced engine performance, poor fuel economy, a flashing check engine light, and potential stalling.

3. What can cause a cylinder 4 misfire in a Suzuki?

Common causes include a faulty spark plug, a bad ignition coil, a clogged fuel injector, low compression, or a vacuum leak near cylinder 4.

4. Can I drive my Suzuki with a P0304 code?

Driving with a P0304 code is not recommended, as it can lead to engine damage or catalytic converter failure if the issue isn’t resolved.

5. How do I diagnose a P0304 code in a Suzuki?

Start by inspecting the spark plug, ignition coil, and fuel injector for cylinder 4. You may also need to perform a compression test or check for vacuum leaks.

6. How much does it cost to fix a P0304 code on a Suzuki?

The cost depends on the cause. Spark plug replacement may cost $50–$150, while ignition coil replacement or injector repairs can range from $100–$500.

7. Can a dirty fuel injector cause a P0304 code?

Yes, a clogged or malfunctioning fuel injector can prevent proper fuel delivery to cylinder 4, leading to a misfire.

8. Will replacing the spark plugs fix a P0304 code?

Replacing the spark plug in cylinder 4 often resolves the issue, but if the misfire persists, further diagnosis is needed.

9. Can a vacuum leak cause a P0304 code?

Yes, a vacuum leak near cylinder 4 can disrupt the air-fuel mixture, resulting in a misfire.

10. How can I prevent a P0304 code in my Suzuki?

Regular maintenance, including timely spark plug replacement, cleaning fuel injectors, and checking for vacuum leaks, can help prevent cylinder misfires.

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