Technical Description
Cylinder #4 Misfire Detected
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
A P0304 code means that the the car's computer has detectedthat one of the engine's cylinders is not firing properly. In this case it'scylinder#4.
Symptoms
Symptoms may include:
- the engine may be harder to start
- the engine may stumble / stumble, and/or hesitate
- other symptoms may also be present
Causes
A code P0304 may mean that one or more of the following has happened:
- Faulty spark plug or wire
- Faulty coil (pack)
- Faulty oxygen sensor(s)
- Faulty fuel injector
- Burned exhaust valve
- Faulty catalytic converter(s)
- Running out of fuel
- Poor compression
- Defective computer
Possible Solutions
If there are no symptoms, the simplest thing to do is to reset the code andsee if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, checkall wiring and connectors that lead to the cylinders (i.e. spark plugs). Dependingon how long the ignition components have been in the car, it may be a goodidea to replace them as part of your regular maintenance schedule. I wouldsuggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable).Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalyticconverter has gone bad. If you smell rotten eggs in the exhaust, your cat converterneeds to be replaced. I've also heard in other cases the problems were faultyfuel injectors.
Other Reading
P0300 -Random/Multiple Cylinder Misfire Detected
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