What the P0304 code means. The P0304 code will be seen in cars where the ECU has detected that cylinder 4 is not firing properly. The ECU monitors the operation of all cylinders to ensure they are all firing on time, so when one misfires repeatedly, a Check Engine Light is set.
What would cause a misfire on cylinder 4?
Cylinder 4 misfires can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure. The most common reason for this to happen is faulty or worn-out spark plug coil packs, especially if it’s been a while since you had a tune-up.
What does error code P0304 with flashing check engine mean?
When the code P0304 is set in the Powertrain Computer, it means that the Misfire Monitor has detected more than a 2 percent variance in RPM between the firing of any two (or more) cylinders in the firing order.
How much does it cost to fix cylinder 4 misfire?
How Much Does It Cost to Fix a Cylinder 4 Misfire?
| Diagnosis | Average DIY Repair Cost | Average Professional Repair Cost |
|---|---|---|
| Ignition coil replacement | $50-$80 | $100-$200 |
| Distributor or wire replacement | $40-$60 | $90-$125 |
| Valve adjustment | $25-$70 | $250-$350 |
| Fuel injector replacement | $150-$600 | $350-$900 |
Is code P0304 serious?
Trouble code P0304 is generally regarded as being serious in nature, and should not be ignored. This stems from the fact that spark-related misfires lead to the introduction of unburnt fuel into a vehicle’s exhaust, where it is then superheated.
How do I fix error code P0304?
What repairs can fix the P0304 code?
- Spark plugs replacement.
- Replacement of cap & rotor, coil pack, plug wires (depending on vehicle)
- Repair of engine mechanical issues.
- Fixing air leaks.
- Repair of fueling faults.
How do you fix a number 4 cylinder misfire?
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Can I drive my car with a cylinder 4 misfire?
An engine misfire can be caused by bad spark plugs or imbalanced air/fuel mixture. Driving with a misfire isn’t safe and can damage your engine.
How do I know if my spark plug is misfiring?
Symptoms of misfiring spark plugs include rough idling, uneven power when accelerating, and an increase in exhaust emissions.
How do I know if I have spark plug or coil pack?
Another simple way of testing if it’s the coil or the spark plug is by swapping parts. Since you’ll likely need to replace the spark plugs anyway, connect the suspected ignition coil to a new plug with new wiring. If it still doesn’t fire, it’s the coil. Or, simply unplug the wires from each cylinder one at a time.
Will tune up fix misfire?
A “tune-up” may help to resolve a misfire. A tune-up involves changing the spark plugs, ignition wires, distributor cap, and the rotor. It is a good place to start because it will eliminate some of the potential causes of a misfire if it does not already fix the issue completely.
Are misfires easy to fix?
Repairing a misfiring engine can be simple or complicated, depending on the reason it is misfiring. The most common causes of engine misfires are: worn spark plugs, weak fuel injector, vacuum leak, worn valve seals, carbon tracking, and no voltage at the coil.