Code P0301

Welcome to 2CarPros.

You indicated that you replaced the plugs and injectors. Is that correct? Did you replace the coil pack on cylinder 1? If you haven't try this. Switch that coil pack with a different one and see if the misfire changes to the other cylinder.

Next, have you checked fuel pressure? If not, check that too.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the manufacturer's specs for fuel pressure:

Fuel Pressure

Key ON Engine OFF (KOEO) .................... 379 kPa (55 psi)

Have you checked for engine vacuum leaks?

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

As far as the mass air flow (MAF) it is mounted on the air box and doesn't require the intake to be removed. There are two screws that hold it in place. See the attached pics.

Now, can you tell me if the check engine light is flashing when the engine misfires? Also, do you have a live data scanner?

Let me know.

Joe

Thanks very much for such a quick reply.
1. I just initially replaced all the plugs, coils and injectors just because the vehicle has over 141,000 miles. Thinking back I should have done one at a time however I never really saw the OBD2 read an actual misfire on cylinder 1, but only actually got a code of P0301.

2. I did buy a fuel pressure test kit (love buying tools) and the pressure was spot on.
3.Vacuum leaks. I have gone through countless carburetor cleaner cans looking for any difference and have found nothing, did see a video of someone using a smoker to see if it gets sucked in over the top of the head and have not tried that.
4. My bad about the MAF comment. so many sensors replaced, I have forgotten their location, (again over six months when I have the time) I used a shotgun approach witch may have been my downside (replacing and not resetting?). I rethink now it maybe the EGR valve that is under the intake manifold that is about the only thing I have not replaced.
5. I also bought a scope to look inside the cylinders and found no pitting on the valves...cool tool again. cheap on Amazon.
6. No the engine light never flashes, only lights once and then I look down and notice it. Odd thing is that I got this vehicle from my good friend (was used for his business) it had a GPS device installed to check on the employed driving daily. I had read somewhere that the Ford Escape's, could be sensitive to adding new electronics the wrong places. Could not find the GPS unit until I called the installer Finally found where it was mounted just above the speedometer, removed, all ran clear for 10 minutes then same problem. Only removed the devise not the harness???
7. I have a OB2 scanner and am primarily using the Torque Pro app currently. I had attached the snapshot of the P0301 when last happened today to the original email, 21 minutes into driving.


I hope this helps and am happy to donate to this website but have not been asked at this point. I am pretty sure I will be dropping the car at a shop early next week, but am weary about where to actually do so. I live in SLC Utah. Not a favor of the dealer and have been bitten many times...

Sincerely,
Bman

Welcome back:

No donation needed. I have to be honest, I can't see why the EGR would cause a misfire only on once cylinder. Can you tell me what the compression readings were? I did notice that the long term fuel trim is at the high end. Interestingly, I remember there being an issue with the cylinder head temperature sensor that was causing a misfire issue. Have you noticed anything with the temp gauge, cooling fans, or anything other? Keep in mind, they don't have to exhibit problems and the sensor can still cause a misfire. I'm questioning of that is why the LTFT is on the high end. Let me know if you replaced it.

Joe

Hi Joe,

Thanks again for the help. I bought the temperature sensor on Sunday and will change it out tonight.
Sincerely,
Brent

Sounds good. Let me know the results, and I will keep my fingers crossed for you. LOL

Take care,
Joe