Help Please

[NoVaGT]

I know this is a silly thing to do, as none of you can really diagnose anything over the internet. But maybe someone else has had the same issue and can help me.

I've been running a BAMA 93R tune on my car, and everything has been fine. Then I started noticing a stuttering/bucking of the engine under light/maintenance throttle between 1500RPM and 2100RPM. Then I got a CEL with 2 miss-fire codes. I called BAMA and they said those two miss-fire codes were very common on Coyote motors, and told me how to clear the DTCs and do a crank position sensor re-learn. This happened twice in about a week, and then again earlier this week. All three times the CEL/DTCs happened when cruising right in the RPM range where the stuttering/bucking happens. All three required crank-position sensor re-learns.

Anyways, they said they had a revised tune. They sent it to me, I installed it, and I have the same issues. In fact the 3rd CEL/DTC/crank position sensor re-learn event occurred with their revised tune.

I've data-logged the ECU, and BAMA has the logs. They e-mailed me this morning, and asked if I had an after-market intake. It's stock, and I told them that. In the e-mail I was told there's an over-fueling issue at low RPMs. My meager knowledge of such things makes me wonder if there's too much air suddenly getting in, and the ECU is trying to compensate with more fuel. Dunno, that might not even be a thing. And that wouldn't explain the DTCs/miss-fire codes and need to do a CPS re-learn.

I have had a suspicion that the issue is with the intake/air-filter, as this all seems to have started after replacing the air-intake filter with a new OEM filter from my local dealership. I've twice checked to make sure the lid on the air intake is on properly, and that the electrical wire to the MAFS isn't damaged/disconnected, and it looks fine. I've checked to make sure that I got the proper air-filter, and the Ford part # is correct.

So, while I've been waiting for Bama to get back to me, this morning I returned the car back to the stock tune. And although the stuttering/bucking is lessened, it's still there.

I really don't think this is the tune, I think the tune just makes some other situation worse.

So, any ideas are really appreciated. I'm just very frustrated that my damn-near car is bucking like a wild bronco at low RPMs.

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[TooSoonJunior]

can you host/post up your logs? If its happening with the stock tune then its likely a mechanical issue.

 

[Obsol3te]

If you're still mostly stock, flash to stock and see how it drives.
That would rule the whole tune thing out.

 

[NoVaGT]

can you host/post up your logs? If its happening with the stock tune then its likely a mechanical issue.

They're .csv files, and I didn't know what they really were, so I tried opening one. And it turns out they're Excel spread sheets with massive amounts of numerical data.

I'm not sure how I could make it available, I tried to attach it to this post, but it won't work.

 

[CW16GTPP]

I would definitely go back to stock tune as Obsol3te said and see if runs normal. It's a long shot but i would also make sure your air filter is fine, and that everything with your MAF tube is fine (cracks, loose connections, etc.).

My car was sputtering and I had codes that my car was running lean when my fuel pump was going out. But it was sputtering at all RPM's and had trouble starting up so I don't think that's your issue.

 

[NoVaGT]

As in my first post, the car went back to the stock tune this morning before I drove to work.

The stuttering/bucking is lessened, but still there. And I've (for the 3rd time) checked the lid on the air intake box, and the filter, and the electrical connection/wires to the MAFS.

I'll check the MAFS tube in a bit.

I'm think something along the lines of the MAFS/tube/air-box/air-box lid/seating of the air-filter, because the damned lid is so hard to get off and put back on after changing the air filter.

But would some issue like that cause miss-fires? Or are the two issues separate and un-related?

 

[CW16GTPP]

Yeah I remember that stock air filter box was a pain. It's most likely something with the MAF. If you don't find anything wrong when you check it again I would take it to the dealer.

 

[NoVaGT]

I might try just popping the MAFS out and wiping it down. Maybe it got some crud on it.

Also, BAMA has already e-mailed me a tune meant to address my issues. I'll report back when I get a chance to test it.

 

[scott_0]

I called BAMA and they said those two miss-fire codes were very common on Coyote motors.

see, this is why people bash them! that is BS that the codes are normal so because they tell you its normal, they think you should be happy with it? dude, do yourself a favor and get away from them! I used to be a big supporter of them, but when I added long tubes to my 2011 gt and got a proper dyno tune by Revolution Automotive in Baltimore, and spoke with Adam about tuning these cars, I realized Bama was bad man, my 2016 gt is tuned by Lund and Ive never gotten any codes :headbonk:

 

[Bluemustang]

Something sounds wrong. That is a very simple tune because you have no mods. I've had several tunes from Bama and they were all fine.

I suggest trying their tune revision - if not take it to Ford because something is wrong. Something with the MAF or the intake / filter might be causing it.

It really doesn't make sense for us to speculate or trash Bama when we don't even know if there's a problem with the tune. Besides, it's not like everyone has been devoid of problems with other tuners. These things can happen.

It doesn't make sense that a simple tune from Bama on a stock car could be so horribly bad when so many other people have had great results and no problems. There's not enough information to conclude the tune is bad at this point.

 

[Bluemustang]

see, this is why people bash them! that is BS that the codes are normal so because they tell you its normal, they think you should be happy with it? dude, do yourself a favor and get away from them! I used to be a big supporter of them, but when I added long tubes to my 2011 gt and got a proper dyno tune by Revolution Automotive in Baltimore, and spoke with Adam about tuning these cars, I realized Bama was bad man, my 2016 gt is tuned by Lund and Ive never gotten any codes :headbonk:

Comparing a custom dyno tune from Rev Auto to a canned email tune from Bama is not a fair comparison.

 

[Quackfoo]

Comparing a custom dyno tune from Rev Auto to a canned email tune from Bama is not a fair comparison.

That they told him those codes are normal is a pretty good reason to bash them, because they aren't. The revised tune probably just disables sensors or something equally silly.

Get your car fixed up, then switch to lund or livernois.

 

[Commbubba19]

Don't make this more complicated than it is.


Car ran fine on tune.

You replaced the air filter.

Car has issues.

It's reasonable to deduce that the work done is causing the issue. Likely unmetered air is getting into the intake or a vacuum line may not be properly connected.

I would recommend going through the entire process of replacing the air filter again and double check your work. Making sure the airbox is fully sealed and that all clamps are tightened correctly.

Then check the hoses around the intake tube and throttle body as well.

 

[NoVaGT]

Don't make this more complicated than it is.


Car ran fine on tune.

You replaced the air filter.

Car has issues.

It's reasonable to deduce that the work done is causing the issue. Likely unmetered air is getting into the intake or a vacuum line may not be properly connected.

I would recommend going through the entire process of replacing the air filter again and double check your work. Making sure the airbox is fully sealed and that all clamps are tightened correctly.

Then check the hoses around the intake tube and throttle body as well.

This is where my thinking is at.

 

[NoVaGT]

I'm also going to check my MAFS and make sure the element is clean. If it's possible to do that after removing it.

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