P0304 Suzuki Code - Cylinder 4 Misfire Detected
Quick Answer
The Engine Control Module (ECM) uses information from the crankshaft position sensor and the camshaft position sensor to determine when an engine cylinder misfire is occurring. Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #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 Suzuki indicates Cylinder 4 Misfire Detected.
- Common causes
- Common causes include Faulty Spark Plug #4, Clogged or faulty Fuel Injector #4, Faulty Ignition Coil #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.
Code P0304 Suzuki Description
Extreme cylinder misfire events can cause catalytic converter damage. The malfunction indicator lamp (MIL) will flash when the conditions for catalytic converter damage are present. The Diagnostic Trouble Codes (DTC) P0304 correspond to cylinders 4. When the ECM detects that one or more specific cylinders are misfiring, the DTC for the respective misfiring cylinder will set, and up to 2 of the corresponding fuel injectors are disabled for a minimum of 30 s. The ECM will then re-enable the fuel injector and, after approximately 200 engine revolutions, will determine if the misfire is still present. If the misfire is still present, the ECM will disable the fuel injector again repeating the process. If the misfire is not present, the fuel injector will remain enabled by the ECM. In Spark Ignition Direct Injection (SIDI) system applications, if a fuel injector fault DTC is set during a misfire event, the ECM will not re-enable the injector.
What are the Possible Causes of the DTC P0304 Suzuki?
- Faulty Spark Plug #4
- Clogged or faulty Fuel Injector #4
- Faulty Ignition Coil #4
- Fuel Injector #4 harness is open or shorted
- Fuel Injector #4 circuit poor electrical connection
- Ignition Coil #4 harness is open or shorted
- Ignition Coil #4 circuit poor electrical connection
- Insufficient cylinder 4 compression
- Incorrect fuel pressure
- Intake air leak
How to Fix the DTC P0304 Suzuki?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0304 Suzuki code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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