I have a misfire on cylinder 4 (p0304) and when you pull the sparkplug out, its soaked in oil. the whole thing where the plug comes from has oil in it. this is the only cylinder that has this problem. all the other ones are fine

P0304 is a misfire on cly. #4. Pull the plug and see if there is a lot of oil that may be fouling it out. If you are burning oil, one thing you can do is switch to synthetic. Synthetic oil will not burn and it can minimize the loss.


Also if you only replaced one coil pac, you may have a problem there, but that is remote since each coil runs two cylinders and you only have a cly.#4 code.

Hope this helps.

Part is cylinder 4 misfire. Try disconnecting the lead for cylinder 4 sparkplug to see if it runs the same. If it does, plum the plug and sees if the conductor is eroded or gap is too great. Gap the plug and reinstall. It could be coil for that cylinder also. Could also be a bad plug wire

Could be several things, such as leaky fuel injector flooding cylinder after shutdown, or oil fouling plug due to bad valve guide seal of broken piston ring. Install brand new plug, run about 20 miles, let engine get cold overnight, remove plug to red is it wet with gas or oil sooty.

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.

well the first thing you should do is check the compression in cyl number four the compression should be within 5-8 of the nearest cyl if you see a significant diffrence in pressure you have a week cylinder...also is there any discoloration on the number 4 spark plug a coolant soaked or fuel soaked spark plug can lead u in the right direction..lastly i would take a look at the exact fuel pressure you will need a gauge and take a look low or high fuel pressure can cause a misfire....keep in mind that a clogged catylitic convertor can also cause a misfire do to accesive back pressure give your convertor a tap and see if its rattling ....hopefully this can lead u in the right direction ...good luck

P0304 is Cylinder 4 Misfire Detected.

Basically, your number 4 cylinder is misfiring. Maybe a bad spark plug, or bad fuel injector. These causes are only guesses because many thing can cause a misfire in one cylinder.

look for weak valve springs.

well the codes
p0300 multiple misfire
p0303 misfire cylinder 3
p0304 misfire cylinder 4
p0307 misfire cylinder 7

can be alot of things check cylinders for compression is what i would do first..