Question about 2004 Ford Ranger
A code P0304 may mean that one or more of the following has happened:
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.
i've heard of the 5.4l's with the "cop" set up devolping moisture under a coil. if it hasn't again that is most likely the problem. to prevent this you could remove each coil and apply dielectric grease to the tops of the plugs.
Posted on Feb 18, 2010
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