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

A P0304 means you have a misfire in cylinder #4. Could be a bad spark plug, spark plug wire or coil. Start with a new plug and wires. See if that fixes it

Electrical contact cleaner is not good for map or maf sensors. There is a special cleaner for this however I have never actually had any luck with the cleaners. It very well could be the sensor going bad. Not being familiar with your car I can say I had the exact same issue with a 97 mercury cougar and it was the sensor. I would double check the plug making sure the gap is correct and it is not cracked, check the wire (swap to another cylinder if you can and see if the error code swaps as well), check the coil pack as well.

P0441 = EVAP PURGEFLOW MONITOR that means insufficient or excessive vapor flow detected during evaporative system .
P0304= a misfire in cylinder # 3 answers to these p0441 a bad gas cap possible , and p0304 possible bad coil on cylinder #3, try clearing codes and see if they show back up or you get bad performance , then try replacing gas cap and then coil pack . I really hope this gets you on the right track .
Woody

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

It's called a "dead" cylinder and you did right by replacing the cam sensor. Still does it though? Do a ohm meter test on the injectors to find if one is bad. The one that shows the lowest reading compared to the rest is the bad one. Code being P0304 means it's #4 cylinder dead. IF that injector shows a low reading, replace it or have it cleaned professionally. If the test shows all injectors reading the same, 16.5 or so, none are bad. do a compression test on all cylinders, if you find #4 cylinder is on the low side with a compression test, you have a bad exhaust valve and must give it attention.

Hi there:
DTC 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

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 this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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.

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

P0304, could be a bad plug, bad coil, bad injector, low compression, or other stuff. The P0700, you need to look at codes in the TCM. It is telling you that the trans computer has a fault in it.

youre p0300 code is radom miss fire,usually cause by bad wires or bad coil pack,p0304 indicates missfire at cylinder 4,cause bad wire or plug.p0335 indicates crank sensor circuit malfunction can cause all of the above,because its part of the timing position for the spark at the plugs,iwould check crank sensor if its within specs!