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2007 Chrysler 300 Touring 3.5l misfiring cylinder one I have replaced the coil packs, spark plugs, injectors and sensors. Car runs great but has a skip

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Both coils do not fire on 1 and 4. Will start but only running on 2 cylinders. Could both coils be bad or should I look elsewhere?


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Jan 31, 2016 | Cars & Trucks

1 Answer

My 06 Chrysler 300C has a P0301 misfire. How do I fix it?


im having the same issues! i have 2007 chrysler 300 i changed all 6 spark plugs and the coil pack on cylinder 1! my check egine light is still on! dont no what too do now!

Jan 18, 2013 | Chrysler Cars & Trucks

2 Answers

Engine cranks but wont start has an obd p 300 &p304 help me


P0300 Random/Multiple Cylinder Misfire Detected, the 304 is for cylinder number 4 any of these could be wrong 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

Jun 21, 2011 | 1996 Eagle Vision

3 Answers

P0304 code-Misfire on cylinder 4


A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.-------- Symptoms may include:--------
  • the engine may be harder to start.
  • the engine may stumble / stumble, and/or hesitate.
  • other symptoms may also be present.
--------------- 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.
  • ---------------------
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.-----------------
This should help.Thanks.Helpmech.

Mar 27, 2011 | 2007 Chrysler PT Cruiser Touring Hatchback

2 Answers

I have a 2007 Chrysler Sebring with a 2.4 engine. The check engine light came on and the car runs rough. Had the code checked and it came back with a 303, 302 and 300 codes. What is the most common...


Hello Frybird.

The codes you have are engine misfires.
Code 300 is random misfire (could be any cylinder).
Code 302 is cylinder #2 misfire and 303 cylinder 3 misfire.

Most common causes are ignition issues.
Spark plugs, ignition wires/boots and ignition coils.

Next would be fuel issues such as fuel injectors.
Next would be emission components such as EGR valves.
Then in a worst case condition would be engine wear parts (valves, camshafts etc.)

The place to begin is ignition as this is a common failure on most cars.

If you need further assistance regarding your question please ask me here in a comment.
Thank you for using FixYa.

KL

Feb 11, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

Jan 17, 2011 | Hyundai Sonata Cars & Trucks

1 Answer

What is the wire that plugs into the back of the coil pack? The computer said Cylinder 3 misfire. Have checked the spark plug, spark plug boot, and the coil pack.


You leave all coil pack connectors on their respective cylinders.
Usually the crank position sensor tells, the computer where the pistons are,by where the flywheel is,as it passes the sensor.
You leave all injector connectors in their number sequence.
Every vehicle uses different ways of pulsing the injectors. Not familiar with yours

Most likely NO,to the coils and injectors being tied together.
You can not spray fuel and try to ignite it, at the same time,it has to get into the cylinder and be compressed, one cycle before the spark.

You could switch injectors,and a relative did that, earlier this year, based on your theory. Sound thinking,a lot of work and not your problem.

Might add, that while your plugs may needed to be replaced,they had no effect either. Personally, never had a plug failure in 45 years,could happen I guess.

So you buy one new coil,start on one side of engine,and walk that coil from one cylinder to the next,every time you get a 300 misfire code. Put the OE back and move the new one. Consider you may have others on their way to going bad.

Make sure you have no vacuum leaks anywhere.

Aug 04, 2010 | 2002 Nissan Sentra

1 Answer

Misfire cylinder 1 and 4,we replace injectors,coils,cat.conv after it burn out,and still misfiring,oh also spark plugs and boots


Curious if your classic was running yet? I have no spark at cylinders 2,3 which are operating on the opposite system as your problem. I replaced the crank sensor, and the coil packs to get this far. Anyone have wiring diagrams on this car?

Feb 09, 2010 | 1998 Chevrolet Malibu

4 Answers

5.3 L Missing and Rough Idle Intermittently


i have a 2001 chevy z-71 5.3L. I keep getting a random/multiple misfire code for cylinder 1 . I have replaced plugs, wires, coil pack(only on #1 cylinder)., and fuel pump. I still keep getting the cylinder 1 misfire code. I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly stops misfiring at around 1000 rpms. you can here the engine miss at idle but truck runs great on road . anyone else ever had this problem?

May 05, 2009 | 1999 Chevrolet Silverado 1500

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