Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2000 Mercury Grand Marquis, check engine code 304. › 2000 Mercury Grand Marquis, check engine code 304.
September 20, 2014 at 5:20 am
#622115
That code is pointing you to cylinder number 4. It sounds like a secondary ignition misfire based on symptoms described. It could, however be something else. Before throwing parts at it, try some simple diagnostic tests. Here is some great info from Eric regarding where you might start…