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).
I found on the net the cylinder numbers. If you stand in front of the engine, cylinders 1, 2, and 3 are at the back (firewall side) from left to right. The front left to right cylinders are 4, 5 and 6. To help clarify cylinder 6 is on the driver side with 4 on passenger side. To get to the back cylinders you have to remove the air plenum.
I might have gotten lucky. I did not want to remove the coil and boot because I found out that my extended warranty was for 84 months. I did remove the electrical connector to the coil pack on cylinder 4 and then reconnected it. The engine ran perfect. The check engine light did remain on. The next day I drove it to work and with the check engine light on, but it still ran fine. When I started it after work the light was out, so it must reset itself. It has not come on again and the van is running fine. If this happens again I will contact the dealer to see if this is covered before I replace any of the parts.
need to find number four coil location
misfire in cylinder #1
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