Engine light came on and code P0304 was the code? which cylinder is cylinder 4?
SOURCE: 2006 Ford Ranger XLT: 6
hi your codes show downstream o2 sensor oxygen sensor evapsystem o2 heater random misfire u need to check these
SOURCE: My check engine light came on and I have a code of P0304
You probably have a loose plug wire on #4 cylinder.
First check for that. If that doesn't help, make sure the injector electrical lead is secure.
Next, replace the spark plug on # 4. If that still doesn't help, then a new injector might be needed. Before springing $$ on a new injector, add a bottle of Techron to the fuel and drive it. Techron will clean up a clogged injector better than anything out there.
Good Luck!
SOURCE: 2004 Ford Escape with 3.0L
P0316 = engine misfire
P0304 = #4 cyl
A very common problem is a bad COP or coil. They can be expensive ($75? at part store), so you could try switching the coil with another cylinder and see if the code changes location with the coil.
They are easy to replace. Unplug the connector. Remove the one screw (8mm?). Pull straight out.
SOURCE: 1999 Ford Taurus 3.0L V6 24V DOHC Duratec Engine
i would check the plug wires and the coils you check the plug wires for bad spots at night start the motor up and look at the plugs if you see a spark arch out the wire and to a peace of metal then the plug wires need to be replace.
SOURCE: I have a 2001 ford
Codes say Cylinder 4, 5 & 6 are not firing. This could be a spark issue or a fuel issue or a mechanical engine failure. Is compression zero? Did they use a compression tester?
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