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The Ford Expedition is a full-size SUV assembled by the American automaker Ford Motor Company. Introduced as the four-door successor of the two-door Ford Bronco, the Expedition has remained in production since the 1997 model year; it is currently in its third model generation.

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What is the most likely cost for Cylinder 4 misfire code P0304?

The vehicle has a noticeable shake when idle, and hesitates when reaching speeds of 55-60 mph. What is the most likely cause?

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'''++Recardo Grady++'''  Code 0304 is a continuous misfire code for cylinder #4. #4 is the rear cyl. on the pass. side. Causes can be a bad coil or a loss of fuel in that cyl. Depending on what size engine your vehicle has, one has the coil-on-plug system while the other does not. On a 5.4L which has the coil-on-plug #4 coil is prone to failure due to water in the plug well from the heater hose that runs above it. Of course it could also be a clogged injector etc. Start with the coil…..The cost for the repair will depend on what you find during your trouble shooting.

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Hi Recardo,

Based on what you've explained, to me it sounds like you may have a worn-out spark plug, ignition wires, or a vacuum leak somewhere in your vehicle. I would inspect cylinder #4's spark plug and wiring for any physical damage. Try a replacement spark plug to see if that fixes the problem. If not, I would recommend taking it to your mechanic for further investigation.

Best of Luck,


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