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Hi Cliff, P0304 is an error code for a misfire of #4 cylinder. This usually means that there is poor / no ignition of fuel in the cylinder and is providing little if any power (due to a number of reasons - including: poor compression, or a faulty #4 spark plug, spark plug wire, distributor, etc). In an 8 cylinder engine, that would mean 1/8 of the power is lost; for a 6 cylinder engine 1/6 of the power is lost; and so on. The more cylinders your engine has, the less likely this problem would be noticed. Loosing 1/4 of the power in a 4 cylinder engine would probably not go unnoticed for long. The unburnt fuel in #4 cylinder is being exhausted with the other cylinders and is being burned in the catalytic converter instead of the engine. If allowed to continue, it may cause the converter to fail. You should have the trouble checked and repaired before it causes other problems. Good luck!
Cylinders 1,2 and 3 are the cylinders on the passenger side and cylinders 4,5 and 6 are the cylinders on the driver's side. They are numbered front to rear. The coil pack will have the cylinder numbers marked on the top of it. The actual firing order is 1-4-2-5-3-6
The top of your coil should look like this: 1 2 3 5 6 4
Your engine looks like this: 1 2 3
FRONT OF ENGINE 4 5 6
Hello campbella697: My name is Roger and I will help you. THe code for #6 cylinder misfire is P0306. This is cylinder specific. How ever P0316 is a different problem all together. Not knowing the year,make,model and engine size I can give you generic possibilities. The code deals with engine revolutions. The possibilities are (1) a damaged crank position sensor (2)ignition system, (3) fuel injector,(4) running out of fuel (5) fuel quality,(6) base engine mechanical or a damaged power train control module. However this should be checked with a scanner by knowledgeable person or you will spend money you don't need to. Should you need further help I will be glad to assist you. Please rate the answer. Thank You for using Fix Ya. Roger
What size Engine?
The Number 4 fuel injector goes to Cylinder #4.
On 3.3L and 3.8L it should be the Front Middle Cylinder.
If you are not sure where Cylinder #4 is. Look on your Electronic Ingition Coil = Distributor. It has small numbers on them #1 thru #6. The numbers are small and black, but they are there. Follow that #4 wire to Cylinder #4. Fuel Injector #4 should be right over the top of that Cylinder. Usually the Cylinders themselves have numbers on them on the engine block, but it is easier for use to use the Ignition Coil as a reference.
Cylinders Numbers should be:
1 - 3 - 5 Rear
2 - 4 - 6 Front
Ignition Coil should be:
6 - 3 Rear
4 - 1 Middle
2 - 5
Let me know if that helped, or if you have any additional information, problems or questions. Feel free to contact me at FixYa.com!