Check Engine light P0304. v8-5.4l 2003 p0304 ford expedit...

Q: Check Engine light P0304.

asked by on February 04, 2016

I am getting a Check Engine light code P0304. I've already had all the spark plugs replaced and coil number 5.

The code P0304 points to a misfire on cylinder number 4. Ford also has a funny cylinder identification pattern, different from many makes, and a diagram should be consulted to determine which cylinder is the right one. The spark plugs have been changed, now suspect the coil on cylinder number 4 or its wiring. A mechanic, like the ones here at YourMechanic, would be more than happy to assist you with an inspection on this engine misfire.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Car won't start. It cranks but won't start.

Just a little note, the water pump is driven by the timing chain and not the fuel pump. Your fuel pump is in the fuel tank and may be the cause of the no start. If you have a full...

On slight acceleration car shakes but only when small amount of gas pedal is pressed and speed at the time don't matter

Hi Rob. Thanks for the question today. There are literally a dozen or more possible reasons why your DeVille is acting in this way. Sometimes failing wheel bearings will create the vibration you're explaining, while in other instances, loose motor...

I am having a problem with my tension pulley bearing/bolt.

Hi Val. Thanks for contacting us today. In short - yeah, this is likely not going to work for you long term. Remember, when metal heats, most adhesives will fail. The right way to resolve this issue, unfortunately, is to...

Related articles

P3419 OBD-II Trouble Code: Cylinder 3 Deactivation/Intake Valve Control Circuit Low
P3419 means a problem was detected with the cylinder deactivation mode due to bad lifters, sensors, solenoids, electrical issues, or low oil pressure.
P0705 OBD-II Trouble Code: Transmission Range Sensor Circuit Malfunction (PRNDL Input)
P0705 code definition Transmission Range Sensor Circuit Malfunction (PRNDL Input) What the P0705 code means Diagnostic trouble code P0705 indicates that the...
P0292 OBD-II Trouble Code: Cylinder 11 Injector Circuit High
P0292 P0292 code definition The P0292 code indicates that the fuel injector circuit in cylinder 11 is not in line with the manufacturer’s reference value. What the P0292 code means The engine control module will turn the fuel injectors on...