Obd code p0304
Hi
P0304 is actually pointing to a misfire in cylinder 4, not a camshaft sensor problem.
There could well actually be two misfires rather than just one because Ford use a wasted spark ignition system wherein two cylinders are fired at once, one of them on its compression stroke and the other on its exhaust stroke, hence the wasted spark on the exhaust stroke.
You say it is "popping" which would lead me to believe that there is a spark issue rather than a fuel issue, because the popping sound would be the fuel igniting either in the exhaust or the intake rather than the cylinder, and this would be confirmed if you were to run the engine and then switch it off and pull the no.4 spark plug and it were to be covered in fuel.
If you were to find two plugs covered in fuel and the rest ok, then the coil pack feeding those two plugs would probably be the problem.
If only one plug were covered in fuel then either the plug or lead feeding that cylinder owuld probably be the issue.
If none of the plugs are covered in fuel, indicating a fuel problem, and you were to swap the no.4 injector with one of the other injectors, and then the fault code were to change to the cylinder into which you swapped the no.4 injector, then the injector would be the problem.
Very best regards
Geordie
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