Need help with DTC codes

[01Romanss]

2019 Mustang GT running LUND tune with headers on E85. Been running this for several years and 25k miles with no problems until last week. Had Ford put in new MT-82 and then codes started within a few hundred miles. Not sure if they are related. Car runs strong but throws P0300 code, random/multiple cylinder misfire, once every week and one P0175 code, system too rich. I’ve read it could be IRMC or maybe my O2 sensors flaking out. Any way to prove what it might be? I’m going to do a crank relearn tomorrow.
Thanks!!

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[larr12]

Did you do a crank relearn?

 

[Cobra Jet]

Here’s a thread I had with details of the crank relearn and KAM resets if needed:
https://www.mustang6g.com/forums/threads/engine-misfire-problems.203556/#post-4075889

 

[HKusp]

What they said^^^^

 

[01Romanss]

Thanks. I’ll get to it soon.

 

[NGOT8R]

If you’re on the factory fuel pump, it could be going bad or the filter sock could be getting clogged.

I would start with what‘s been suggested in the last couple of posts and then see if you can log fuel pressure.

FYI, when my fuel pump failed (one of the brushes seized up), the car was driving normally and then it happened (without any warning), in the turn lane, at a very busy intersection. I ended up having to get the car towed home, where I pulled the pump, cut it open to inspect it and found the seized brush.

I’m also running a Lund tune. When I locked out my IMRCs I paid Lund an additional $150 to turn them off in all four of my tunes.

 

[junits15]

just to be sure, ford did not reflash your ECM did they? Because that "system too rich" code is what happens when you run e85 on a non-e85 tune.

 

[01Romanss]

I returned my car to stock tune before I took it in. They didn’t do a flash since it was only my transmission. I did a crank relearn and reloaded my e85 tune and so far no codes.

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