Question about 1997 Mercury Grand Marquis
A code P0304 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack),
Faulty oxygen sensor(s),
Faulty fuel injector,
Burned exhaust valve,
Faulty catalytic converter(s),
Running out of fuel,
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/wires). 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 equipped). Otherwise, check the coil packs. Sometimes the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your catalytic converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Posted on Oct 21, 2013
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Posted on Jan 02, 2017
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