[badger6]

The engine light in my 2006 Charger flashed on a few weeks ago. The first thing I did was put a new gas cap on it. Bingo! The light went off...for a day. Then it came back on. The code is showing a misfire on Cylinder 4. The actual code is P0304. I changed the spark plug but that wasn't it. She seems to be running a little rough when I stop and using twice the amount of gas. My next though is to replace the coil. I'm heading to the beach in a few weeks and I don't want to take her on the road until this is resolved. Any input or suggestions would be greatly appreciated! :smile2:

 

[mikall01]

You may try this.

SUBJECT:
Multiple Cylinder Misfire Or Rough Idle

OVERVIEW:
This bulletin involves rotating all engine exhaust valves, replacing the valve spring retainer
locks with a new design to increase valve rotation at lower RPM, inspecting/replacing the
MAP sensor (as necessary), and decarbonizing the combustion chamber.
MODELS:
2004 - 2006 (CS) Pacifica
2005 - 2006 (LX) Chrysler 300/Magnum/Charger
NOTE: This bulletin applies to CS models built after February 1, 2004 (MDH 0201XX)
equipped with a 3.5L engine (Sales Code EGN).
NOTE: This bulletin applies to LX models equipped with a 3.5L engine (sales code
EGG) except 2006 vehicles equipped with California Emissions (sales codes
NAE) built on or before May 2, 2006 (MDH 0502XX). See Technical Service
Bulletin 18-016-06 dated May 4, 2006 for more information..
SYMPTOM/CONDITION:
The customer may experience occasional engine misfire (rough running engine) during
certain vehicle operating conditions.
In addition, MIL illumination may also have occurred due to Diagnostic Trouble Code
(DTC) P0300 - Multiple Cylinder Misfire. Various single cylinder misfire DTC's may also be
present. If the frequency of misfire is high, the Powertrain Control Module (PCM) may
place the engine in “Limp-In” mode.
The misfire condition may be caused by one or more engine exhaust valves that are slow
to close due to a build up of carbon on the valve stem

 

[Duane Holman]

As far as your P0304...that's a misfire in the number four cylinder, and will cause your car to run like shit.

You need to inspect/change these parts...

1. Spark plugs <--Cheapest and very easy
2. Spark plug wires <---Also cheap and very easy
3. Coil pack <---Swap the number four coil with the number one. See if the code changes to P0301...
4. Injectors. <---Swap the number four injector with the number one. See if the code changes to P0301...

 

[taffy]

Change your ignition coil #4. That's a easy fix. Buy it on Amazon or Ebay it's way cheaper. i had to change my #3 in January.

 

[Ddaddy]

Change your ignition coil #4. That's a easy fix. Buy it on Amazon or Ebay it's way cheaper. i had to change my #3 in January.

Agreed. Coil packs are inexpensive these days and an easy swap to help determine the source of the issue. I actually keep a spare coil pack in my inventory just for that reason. I consider it a diagnostic tool.

 

[06Daytona]

Almost certainly the coil pack. Takes 5 minutes to replace. Get all 8 it is likely they will all be going out soon.

Get these: