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P0304 mazda P0304

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4 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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wilsodfarm
  • 986 Answers

SOURCE: what could be the cause of a p0304 code on my 2005

#4 cylinder could be faulty plug wire or plug or coil pack,I would start with plugs and plug wire and if it persist change coil pack I hope this helps you

Posted on Dec 09, 2009

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ZJLimited
  • 17970 Answers

SOURCE: mazda mpv 2004 code p0304

Engine missfire Cylinder #4

P0300 at P0304 Diagnostic Code - Random Misfire
Technical Description
Random/Multiple Cylinder Misfire Detected

What does that mean?
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

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 P0300 may mean that one or more of the following has happened:
* Faulty spark plugs or wires
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector(s)
* Burned exhaust valve
* Faulty catalytic converter(s)
* Stuck/blocked EGR valve / passages
* Faulty camshaft position sensor
* Defective computer

Possible Solutions
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope help with this (remember comment and rated this).

Posted on Apr 24, 2010

SOURCE: what does code P0174 and

PO304--is # 3 cylinder misfiring
PO174---is a lean O2 Sensor Code on bank 2,
from the misfire


So you find the cause, of the ignition misfire,and NO,
it is not spark plugs,wires and a long list of parts, that
never fail.

It is a bad ignition coil or igntion module,which ever applies.

Posted on Dec 01, 2010

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Code is PO304 Mazda PROTEGE lx 2002 2.0


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Also if you only replaced one coil pac, you may have a problem there, but that is remote since each coil runs two cylinders and you only have a cly.#4 code.

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I have an 2002 Kia sedona the code p0304 means an 4 cylinder misfire and also the wiring and plugs.I noticed an while back that when I press the gas smoke will come from my tailpipe and now my van is hesitating to go and it stumbles and the check engine light is on,I have the same code p0304.

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What does a pending code mean? I scanned for codes on my van and I got a P0304 and a Pending P0304 and it says 2 codes returned? Can my computer be bad?


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How to fix daignostic codes p0304, p0421 and p0455 efficiently without costing an arm and a leg.


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P0421 is Catilist effeciency. Fix P0304, if P0421 returns you will need a catalitic converter

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