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I am reading a fault code P0304 which I understand to be a

Customer Question
cylinder for misfire. I have...
I am reading a fault code P0304 which I understand to be a cylinder for misfire. I have swapped out the plugs and the ignition package. But the code remains unchanged. I believe cylinder fours the one on the passenger side front. Can you confirm and what are your thoughts?
JA: Have you seen the misfire code before? Has the car been stalling?
Customer: No stalling but I do get an engine light and rough idle associated with the engine light
JA: What is the model/year of your Ford?
Customer: 2009 Lincoln MKZ
JA: Are you fixing your MKZ yourself? What have you tried so far?
Customer: Yes we’re doing it ourselves. So far I have swapped the spark plug and the ignition coil package. The fault code remained P030 for both times.
JA: Anything else you want the mechanic to know before I connect you?
Customer: Also we have run a lot of fuel system cleaner through the system. Probably five or six tankfuls. That seems to have no effect.
Submitted: 29 days ago.Category: Ford
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Answered in 2 minutes by:
11/17/2017
Ford Mechanic: EricFromCT, Ford Technician replied 29 days ago
EricFromCT
EricFromCT, Ford Technician
Category: Ford
Satisfied Customers: 4,157
Experience: 20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified
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Ford Mechanic: EricFromCT, Ford Technician replied 29 days ago

Number 4 cylinder is the front one on the passenger side. If you already swapped the coil and plug, then I suggest you try swapping the injector as well. If after that the number 4 misfire is still present, then you either have a base engine concern, such as a lifter or valve. Can you try swapping the injector and let me know?

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Category: Ford
Satisfied Customers: 4,157
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Experience: 20 years dealership exp., ASE A1-A9 L1 L2, Ford Lincoln Mercury Senior Master, Diesel Certified

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