Check Engine Light - Remove Mild Mods Before Appt?

[5doorsoffury]

I do not think changing a filter cover will do anything.

If the maf was getting screwed up you would probably see a lean code or crazy trims. There isn't much you can do to screw up the maf readings by using a different air filter cover from 2 cars with the same motor. If the maf housing inside diameter is the same as well as the maf sensor placement between the 19 and 22 lid and they both have air straitiners in them then there basically identical from the sensors frame of reference.


There is only cyl 2 misfire codes in the OP. That being the case, if it was global like gas or a bad sensor every cyl or a bank of cyl's would be affected not just one. IMHO

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[merlin803]

Here is an update - I think we can rule out air box lid/filter changes as being the root cause.

I have been driving it since the software change last week and engine wise, there hasn't been an issue. I have NOT gone back and changed the OEM air box/filter set up since then.

This morning the symptoms returned - the car was very hard to start, it was missing and the check engine light is back on (flashing at first and then just solid).

Back to the service department it went. I will update as I find out more.

 

[merlin803]

Is it standard operating procedure for the service dept. to have to "get a technician on the Ford hotline" to get guidance on every step needed to troubleshoot misfires with multiple cylinders?

They did this last week when they flashed the PCM and are waiting for another call back now from them to find out what to do next.

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