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· Registered
1 Posts
Discussion Starter · #1 ·
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:

· Registered
81 Posts
You may try this.

Multiple Cylinder Misfire Or Rough Idle

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.
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..
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

· Registered
5 Posts
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...

· Premium Member
23,154 Posts
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.
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