Question about 2006 Chevrolet Silverado

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P0304 code I switched coils from one to another new plug and wire on #4 cylinder mileage at this time is 48,000

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  • 344 Answers

You could have a bad fuel injecter for that cylinder,

Posted on Nov 29, 2012

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6ya6ya
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Posted on Jan 02, 2017

  • 14036 Answers

SOURCE: Code P0300 misfired detected. I have cylinder 1

sound like bad ignition module.make sure where coil pack set in module contacts is clean and making good contact.also make sure plugs and wires is good.

Posted on Jan 09, 2010

tripletauto
  • 1450 Answers

SOURCE: Engine light code P0300

I would recommend going back with ac/delco platinum plugs.Some of these "high performance" plugs dont work well in newer gm vehicles.The computer is sensing more than one cylinder misfiring and cant determine the cylinders the style of plug your using could very well be causing this

Posted on Sep 03, 2008

  • 217 Answers

SOURCE: 1998 Cavalier No Spark in cylinders 1 & 4

ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Posted on Jan 17, 2009

Molson02536
  • 3854 Answers

SOURCE: 99 chevy silverado 4x4 getting code p0304

You could have a faulty Fuel injector problem with your poppet valve. There common to go bad and start to leak causing misfires and ruff idle. There is an upgrade to the CSFI to covert to MFI system.

Here is a link that should help you with your P0304: http://members.shaw.ca/betterthanyoutoo/Sticking%20Poppet.htm

Good luck and thank you for using fixya

Posted on Mar 08, 2010

  • 1 Answer

SOURCE: 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?

Posted on Jun 09, 2010

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2 Answers

My car is showing a p0304 code and it wont start, it was running bad I think timing is off how do I fix


Please go to this site, It will give full details on po304. God-Bless! www.obd-codes.com/po304

May 21, 2016 | Cars & Trucks

1 Answer

P0304 misfire 4


There are so many things that can cause a missfire.
Just a thought. IF you switch both the plug and coil with a different cylinder it should show the missfire on that cylinder. You might want to check the compression on cylinder number 4.

You may also want to check the continuity of the conectin to the number 4 coil pack.

Check the plugs that were replaced. They may have been cheap plugs. If number four plug is fouled you may have ring problems.

Hope this helps

Aug 26, 2013 | Nissan Altima Cars & Trucks

2 Answers

OBD11 problem code p304-ive tried everything! please help!


  • P0304 is a detected misfire in cylender 4 only.

  • First thing I would like you to check is your firing order. While one misfire can make the engine hesitate and run awful it is not likely to preven all together starting.

  • Here is your firing order, double check

11_7_2011_12_07_06_am.jpg

  • You said you changed the coil pace, wires and plugs not long ago and still get the code correct? Assuming the firing order is correct we will move on.


  • Swap fuel injectors from and cylinder with #4. Now reset the codes and see if the code remains a P0304 or weather it moves. If it moves to the cylinder you swapped the injector with the the injector is at fault. If not the the injector itself is not the problem.


  • A smell of rotten eggs out of the tail pipe can be the sign of a bad catalytic converter. a P0304 alone rarely means the converter could be at fault it could be as well as a faulty computer.
  • I might suggest to switch the wire from #4 with another cylinder just to make sure you did not get a faulty wire and I would pull the plug from #4 and make sure it is not fouled again.

  • After all of the things you tried and the injector sway I would suggest that you put a pressure gauge on that cylinder and see if you have decent pressure. You could have an undetected head gasket failure, worn valve. A leak down test may have to be performed if the pressure is low to find out where the leak is.


  • Hope this helps.

Nov 06, 2011 | 2002 Kia Sportage

4 Answers

Got a p0304 code come up on my 2002 olds Bravada, replaced camshaft and it still didnt fixed it?


P0304 Code - Cylinder #4 Misfire Detected
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

Causes: 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

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.


Hope helps.

Apr 09, 2011 | 2002 Oldsmobile Bravada

2 Answers

I have good plugs & wires,coils,new EGR.Still getting that code(P0304) do I need a new O2 sensor as well


P0304 is a #4 cylinder misfire. Swap the plug, coil and wire with a different cylinder to see if the code changes to that cylinder or stays with cylinder #4. If the code stays, the fuel injector will need to be replaced. If the code follows the components you changed then your problem is in the components and you can do further swaping of each indiviual component to determine the bad part.

Dec 21, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

1997 altma codes p0304,p0325 thanks mike


p0304 misfire on cylinder #4
p0325 knock sensor circuit

Could be a bad wire, plug, or coil pack on cylinder #4 (or bad distributor connection).

Knock sensor indicates a knock coming from the engine, perhaps from cylinder #4.

This may lead to a diagnosis if you change parts related to cylinder #4.

Good luck.

Jul 06, 2010 | 1997 Nissan.5 Altima

2 Answers

Engine light just came on took to auto zone they gave me this code PO304 Trying to see what it is


A P0304 OBD2 code is "cylinder #4 misfire detected". The first place to start is your spark plugs. 1. Check condition and for wear. 2. check the spark plug wires or coil packs(depending on which you have).

Feb 27, 2010 | 2005 Jeep Liberty

1 Answer

Getting a code P0304 on my 1999 Dodge 1500 5.2L.I changed my spark plugs, wires, cap and rotor about 3-4 mos. ago and have had my check engine lite come on three different times and stay on for 3-4 days at...


the code that is given means that the coil, plug ,plug wires, for that cylinder could be bad, check spark plug and see if this is the problem or a bad wire.

Nov 14, 2009 | Dodge Pickup Cars & Trucks

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