JamesG5592

I have a 2014 Mustang GT that is having random stalling issues when it is cold outside. Happens once a week now sometimes it will go 10 days no issues. I will be posting a link to the data log below
https://www.dropbox.com/sh/6g19og6kvoido1t/AAAWrrLHcXTrxSKyoZcuqWSVa?dl=0

Some things to notate
Car has 96000 miles only owner
Rough stage 3 kit supercharged dyno tunes by brenspeed since 7k miles
No other issues


Any info would be helpful
Already left with ford and another shop twice and it never stalled so no information was useful.

JamesG5592

Bump.

Derf00

how many miles are on the plugs, fuel filter, and AF? During extreme weather conditions, little things like that start to have a bigger impact. Might want to change them all.

Also, clean the MAF sensor out and check for a fouled throttle plate.

JamesG5592

With the fuel filter from my understanding it is built in lifetime for the fuel pump. That has not been replaced.
The plugs are roughly 15k miles
With the throttle plate what do you mean? I clean the throttle body monthly

JamesG5592

Also with the air filter it's a roush filter that's cleanable that I clean monthly


The odd thing is with the data logs you can see the fuel trim rises to a 1.66.

Derf00

Is that ST Fuel Trim or LT Fuel Trim? and you say rising so the value has '+' in front of it? If it's rising it's because it thinks it's running lean so it's adding fuel.

Throttle body plate is the butterfly that opens/closes in the throttle body. If you clean that regularly then that's not the issue.

You didn't mention anything about the MAF. the MAF is the sensor that sits in the air intake hose between the Air Cleaner Assembly and the Throttle Body. Since you have a reusable air filter that you're cleaning monthly, it's very well possible you have a light oil coating on the sensor wire of the MAF. You need to use either MAF cleaner, Electronics cleaner, or Throttle body cleaner to spray off this sensor.

JamesG5592

I clean the throttle body plate regularly.

As far as the MAF sensor I just cleaned that an hour ago.

The link in the original post shows two data logs I have recorded with an SCT tuner that show the rich mixture that occurred quickly that leads to the stall


It is definitely inconsistent as far as days it will do it and days it won't. Once every 10 days seems to be the current scenario except yesterday and the day before it occurred each day.

JamesG5592

With the sensor I did see the unit has that small ball in between the wire. Is it red by default ? The reason I ask as you know rough cai are red and I seen the ball is red. Both before and after cleaning.

Derf00

So i took a look at your log and noticed an odd pattern in the data.

Here's an Example and it's always found when Column AA (Open Loop) is set to '1' everything is fine but, when it's set to '0' that's when things get screwy and just about all of the columns from AB over to AH go back to default, zero, or start up conditions. Especially fuel-trim. You can see an example of this in rows 73,065 through 73,347.

Something is making the vehicle think it's just started up or is momentarily cutting out the PCM which cuts the fuel and causes it to stall.

Normally you could just say the car was restarted but, not when the RPMS haven't changed and show the engine still running at anywhere between 1300 RPM up to I think I saw 2600 RPM

Check your wiring harness and connections, check your grounding points check your fuses and relays.

Beyond that you should send the data log to a dyno shop to see what they think.

JamesG5592

I have actually got a DTC code.
Had to get someone to hook up with a MAC reader

P025A