2019 Mustang GT "Bogging" Issue

[Guitar00Dude]

Hello everyone. I began discussing my issue as a reply to transmission post, but it seems I was not experiencing the same problem as the thread was referring to. I've had the car in to the dealer twice over the past 25 days. First time they said my PCM had to be updated. Then when I brought it back when nothing changed they tried to say it was normal. I somewhat demanded a manager to go for a ride with me. After he witnessed this he agreed it was not normal. They gave me a loaner and had it for a week. They claimed to have sent a "snapshot" to Ford and were guided to changed the MAF sensor and active grille sensor (... I thought only the Ecos had them?). Told me it was fixed.... well it isn't. When I told them they said "We'll let Ford know and see if there is anything more we can do"... uh... if? Lol. After almost a week of radio silence from the dealer I decided to reach out to Ford. I currently have a case open and a Customer Service Manager working with them on my behalf. At this point I have no idea what is causing the "bogging" issue... not even sure if bogging is the right term. The latest thought is it has something to do with my IMRCs? I have included a video of what happens. Typically only when the car and trans are totally warned up and between 38 - 55 MPH. It has never occurred going 60+ on a highway.
The issue happens 3 times. At 8 seconds 32 and 41 in the clip. The change in vacuum is the visual clue, but you can hear it happen and the car jitters a bit. Almost like I am letting off of the pedal for a couple seconds and back on.

Has anyone experienced anything similar? What do you think could cause this kind of behavior in the car? Thank you in advance!

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[Guitar00Dude]

Might hold a record for most views and no replies lol... bump.

 

[Kong76]

Are you running your AC?


Throttle position sensor going bad??

 

[ice445]

Well, it's not gonna be easy to find, that's for sure. Does kinda seem like an IMRC fault, where the flap is adjusting for a different throttle state than actual, then realizing its mistake and going back. It's gonna take some logging and Ford hotline hours to get this fixed, and it sounds like the dealer doesn't care to do it. I'd want to look at throttle position for starters.

 

[Guitar00Dude]

Are you running your AC?


Throttle position sensor going bad??

Hey Kong76. It happens regardless of whether I have my A/C on or not. Could be the TPS though. I think it comes down two things.. the TPS or the IMRCs.

 

[Guitar00Dude]

Well, it's not gonna be easy to find, that's for sure. Does kinda seem like an IMRC fault, where the flap is adjusting for a different throttle state than actual, then realizing its mistake and going back. It's gonna take some logging and Ford hotline hours to get this fixed, and it sounds like the dealer doesn't care to do it. I'd want to look at throttle position for starters.

Thanks for the input Ice445. I agree. I have not heard from the dealer since Wednesday, June 10th when I told them I still had the issue. I am supposed to hear back from the Ford Customer Service Manager assigned to my case by the end of today. The lack of professionalism from the dealer I chose to go to is alarming for me. I even replied to their survey with honesty and they haven't even replied to that. Not sure how Ford works, but in my company we are forced to reply to any survey scored lower than an 8 out of a 10 scale. If they were just honest and upfront and let me know they need more time, I would be very understanding.

 

[Guitar00Dude]

I will say I am leaning on an issue with the IMRC system. When it happens, I don't seem to slow down. I feel like if it was the throttle body itself I would see myself slow down a bit. My speed seems to remain constant, but the vacuum changes.

 

[Guitar00Dude]

UPDATE: I received a call from the Ford CSM stating the dealership will be reaching out to schedule another time for me to bring my vehicle in for more diagnostics. When I hung up the phone, a Service Supervisor from the dealer called me within seconds and has been setup to drop the car off on July 6th and they will be providing a loaner. She said I should expect to not have the car "for awhile", but then said "a few days".She did apologize for the lack of communication which was nice I guess.

Well... I guess I will update you all in a couple weeks.

Would you have pushed to drop it off immediately? Just curious... I don't think the issue is hurting the car, but makes driving to and from work annoying.

 

[Elp_jc]

SUCKS big time having those issues on a basically new car. How many miles? Any service, accident, modification, or some other event that triggered when it started?

 

[Guitar00Dude]

SUCKS big time having those issues on a basically new car. How many miles? Any service, accident, modification, or some other event that triggered when it started?

Currently have 2,2xx miles. Purchased new April 7th. No service, accident or mod. First time I brought it in was for this to get looked at. Also had a clicking sound under the car and it was a bad driver's side axle... that was thankfully fixed.

I noticed it very early on. For a while I thought maybe I was getting bad gas. Then after trying a few different stations I realized something else was going on. I feel like ive had this issue since I got the car.

 

[BigBeed]

What's your batter voltage while idling and driving? I've seen people having a similar issue with the "smart" battery charging system choking down the alternator and it causes hesitations and poor throttle response.

 

[Guitar00Dude]

What's your batter voltage while idling and driving? I've seen people having a similar issue with the "smart" battery charging system choking down the alternator and it causes hesitations and poor throttle response.

Voltage seems to be rather consistent at 13 volts. I don't notice it dipping or bouncing around.

 

[Dfeeds]

Would you have pushed to drop it off immediately? Just curious... I don't think the issue is hurting the car, but makes driving to and from work annoying.

Personally? No. You don't know their current work load. If you did push, and it got in sooner, one of two things would most likely be accomplished. The first being that they take it in but the car just sits until early July, in their lot. The second is a tech gets a long and annoying diagnostic job thrusted on their already busy work load; which could lead to much less thorough work than the car needs.

I may be speaking for myself, but when I sub in for customer service, attitude is everything. If someone calls in frustrated but polite and reasonable to work with, then I have no problem going above and beyond (keeping tabs, following up, etc). If someone calls in and is throwing out the "this is unacceptable" and "I demand this is done today" stuff, sprinkled with the mandated insults, then they can shove it. They're getting the bare minimum I'm required to give. Then again, I just have a weird thing against how our current society rewards poor behavior.

EDIT: Actually, a third outcome just hit me. It would be that you get the B team, and you're right back to square one with no one finding a problem.

 

[Guitar00Dude]

Personally? No. You don't know their current work load. If you did push, and it got in sooner, one of two things would most likely be accomplished. The first being that they take it in but the car just sits until early July, in their lot. The second is a tech gets a long and annoying diagnostic job thrusted on their already busy work load; which could lead to much less thorough work than the car needs.

I may be speaking for myself, but when I sub in for customer service, attitude is everything. If someone calls in frustrated but polite and reasonable to work with, then I have no problem going above and beyond (keeping tabs, following up, etc). If someone calls in and is throwing out the "this is unacceptable" and "I demand this is done today" stuff, sprinkled with the mandated insults, then they can shove it. They're getting the bare minimum I'm required to give. Then again, I just have a weird thing against how our current society rewards poor behavior.

EDIT: Actually, a third outcome just hit me. It would be that you get the B team, and you're right back to square one with no one finding a problem.

This dealer has a multi-level garage where service cars are parked. I am not really interested in trying to get it fixed sooner, but I am unsure, as they are, if the issue could be causing additional damage over time. The issue also causes the car to stutter while going over 40mph which I believe is a safety concern.

I have been nothing but professional with them from the beginning. I only reached out to Ford because they were not returning my attempts to contact them. I have worked in the hospitality industry for 15+ years and have seen the worst of the worst in terms of demanding guests/customers. I know better.

 

[Dfeeds]

This dealer has a multi-level garage where service cars are parked. I am not really interested in trying to get it fixed sooner, but I am unsure, as they are, if the issue could be causing additional damage over time. The issue also causes the car to stutter while going over 40mph which I believe is a safety concern.

I have been nothing but professional with them from the beginning. I only reached out to Ford because they were not returning my attempts to contact them. I have worked in the hospitality industry for 15+ years and have seen the worst of the worst in terms of demanding guests/customers. I know better.

I wasn't insinuating you were, so I apologize if it seemed that way. You were right to reach out to Ford. It's all a balancing act. You do need to push to get passed the first wall of defense, so to speak, but you definitely don't want to irritate the person that is the difference between a "it's normal" and "all fixed!"

As per the issue causing harm. Does it stop stuttering if you give it more throttle? More importantly, does it just downshift? If so then I wouldn't say you're in any danger. It just seems like the computer thinks you're accelerating for a split second. PCM update would be my first move, but not the MAF sensor. That seems like an odd course of action, IMO. It's not surging, and you didn't mention it felt down on power. I also don't think bogging is the right term. The engine is bogged down, or lugging, but that's more of a byproduct of the issue at hand because you're in a high gear at real low engine speeds.

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