Question about 2004 Ford Ranger

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Trouble codes I am showing Engine trouble codes PO304 and PO316. #4 plug and wire have been replaced. Do I need to replace ignightor coil?

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  • army138guy Oct 23, 2008

    have the same problem PO303 and PO316 replaced plugs and wires but problem came back just a few days later?

  • Anonymous Dec 21, 2008

    i am having the same problem myself. i do believe if you've changed the plug and wire and it didnt fix it, then yes, you should try the coil pack.

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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.
Code P0316
i've heard of the 5.4l's with the "cop" set up devolping moisture under a coil. if it hasn't again that is most likely the problem. to prevent this you could remove each coil and apply dielectric grease to the tops of the plugs.

Posted on Feb 18, 2010

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Service engine light stays on after i got the code for a #4 miss fire, changed out plugs, wires and even replaces the coil pack on my #4 what else is wrong


What codes do you have?

You use the codes & diagnostic manuals,
to decide what testing to do,not replace anything at all

Spark plugs seldom go bad or fail to fire,maybe never in
your lifetime

I may be the exception, but never replace plug wires.
If you have a used vehicle & depend on a repair shop
that too many hands abused them, then change them

The idea is to use professional tools such as reference
material & an oscilloscope to look into things & spot a problem
part,then change it

Now your coil for #4 may have not been the problem
A code for a misfire such as a PO304 but not the coil causing
it or a different coil spiking the pcm/ecm & giving you all sorts of
misleading codes

You could have a bad injector on#4 or a vacuum leak on injector
& you go down the trouble chart or tree on your reference material
& continue testing

I can write a book but can't diagnose without the vehicle

You either go to Helm.Com and buy the necessary manuals
or go to a repair shop to have them do other testing, keep in
mind they know not to do the plugs,wires etc you did

There are shops that will throw parts at it, then ask for you
authorization to continue, they should be working only on the
main problem you go there for,then you build the relationship,
if they prove they can solve your complaint

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I need a fix on trouble codesP0304,P0305,P03060,misfire multiple cylinders for 2002 dodge caravan 3.3L v6


all codes will show the same results
Symptoms 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.

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this is an obd2 trouble code table, it can help u understand the meaning of code.
and for p0406 you can go here.
for p0304
Causes could be:
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 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.

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