P0304 Acura Code - No. 4 Cylinder Misfire Detected
Quick Answer
The crankshaft vibrates slightly when each cylinder fires. Common causes include Valve adjustment, Faulty spark plug #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 Acura indicates No. 4 Cylinder Misfire Detected.
- Common causes
- Common causes include Valve adjustment, Faulty spark plug #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 Acura Description
There are two types of misfire detection: Type 1: When the number of misfires per 200 engine revolutions reaches the level that can damage the three-way catalyst (TWC), a DTC is stored and the MIL blinks. Type 2: When the number of misfires per 1,000 engine revolutions reaches the level that affects exhaust emissions but is not severe enough to immediately damage the catalyst, a DTC is stored, and the MIL comes on.
What are the Possible Causes of the DTC P0304 Acura?
- Valve adjustment
- Faulty spark plug #4
- Faulty ignition coil #4
- Clogged or faulty fuel injector #4
- Intake air leak
- Insufficient cylinder #4 compression
- Incorrect fuel pressure
How to Fix the DTC P0304 Acura?
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 Acura 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 Acura Code
1. What are the common symptoms of an OBDII code P0304 in an Acura?
- Common symptoms include engine misfires, rough idling, loss of power, and potential engine vibration.
2. What are the possible causes of a No. 4 Cylinder Misfire Detected code in an Acura?
- Causes may include faulty spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, or a faulty engine control module.
3. How can I diagnose the source of a No. 4 Cylinder Misfire Detected code in my Acura?
- Diagnostic steps may involve checking spark plugs, ignition coils, fuel injectors, vacuum hoses, compression levels, and using a scan tool to analyze live engine data.
4. Can driving with a P0304 OBDII code in my Acura cause further damage?
- Continued driving with a misfire can potentially damage the catalytic converter, oxygen sensors, and other engine components over time.
5. How can I repair a No. 4 Cylinder Misfire Detected code in my Acura?
- Repair may involve replacing faulty spark plugs, ignition coils, fuel injectors, addressing vacuum leaks, performing a compression test, or reprogramming the engine control module.
6. Can a dirty fuel system contribute to a P0304 code in an Acura?
- Yes, a dirty fuel system can lead to fuel delivery issues, potentially causing a misfire in the No. 4 cylinder.
7. Is it safe to continue driving my Acura with a P0304 code if the engine runs smoothly?
- Even if the engine runs smoothly, it is not recommended to drive with a misfire code as it can still cause long-term damage and affect overall performance.
8. How much does it typically cost to repair a No. 4 Cylinder Misfire Detected code in an Acura?
- Repair costs for addressing a P0304 code can vary depending on the root cause, but it may range from $100 to $500 or more, including parts and labor.
9. Can a P0304 code be triggered by a faulty engine sensor in an Acura?
- Yes, a malfunctioning engine sensor, such as the crankshaft position sensor or camshaft position sensor, can lead to a misfire code like P0304.
10. Are there any preventive maintenance steps to avoid a No. 4 Cylinder Misfire Detected code in my Acura?
- Regularly scheduled maintenance, such as changing spark plugs, checking ignition components, and ensuring a clean fuel system, can help prevent misfire issues and related OBDII codes.
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