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  1. Full Accessory Power Active

    Jacob, When I had my throttle body and mass air sensor cleaned, the problem went away for a bit, but then came back again. I'm still at the point of having the rough idle at a stop light when the car is hot every now and then, but so far, thankfully, it has not stalled or triggered a code. I...
  2. New TSB issued for 2020 Mustang 5.0L Built September 1 - December 1, 2020

    Is this your daily driver? Are they giving you a loaner?
  3. 10R80 Owners - ULTIMATE M6G 10R80 Facts + Resolutions to harsh or no shift conditions

    I get the jolt / buck going from park to reverse, but only when the car is cold. Once it is fully warmed up, it is smooth.
  4. Window catching trim when opening the passenger door.

    My 2020 GT does it on both the passenger and driver's side. The work around is the following: I wrap my four fingers around the door latch handle and then put my thumb on the fixed door handle portion. Next, I open the door slightly to the point where the window goes down, but the door still...
  5. 10R80 Owners - ULTIMATE M6G 10R80 Facts + Resolutions to harsh or no shift conditions

    It's a shame that most dealerships are like this today. If there are no pending or visible codes, they assume everything is working according to spec. I might wait until the engine or transmission light comes on before I bring it in.
  6. 10R80 Owners - ULTIMATE M6G 10R80 Facts + Resolutions to harsh or no shift conditions

    I just figured the car was warmed up when the engine coolant temperature gauge was halfway and/or in the middle.
  7. 10R80 Owners - ULTIMATE M6G 10R80 Facts + Resolutions to harsh or no shift conditions

    Update: I have a 2020 Mustang GT Premium, California Special with BORLA ATAK. I had TSB 21-2357 done back on January 31, 2022. Since I did not have any codes, they only updated the software and did a relearn on the trans. Lately, the transmission has been acting up again. A few days ago, on...
  8. What is your oil change frequency?

    2020 Mustang GT Premium, automatic with BORLA ATAK. It's my daily driver. Once the oil life approaches 40%, I get the oil changed at the dealership. They put in full-synthetic 5w20. I'm at 15k now and I have had 4 oil changes already since picking up the car in December 2020
  9. 2019 Mustang GT Auto Very Rough Idle/Engine Stall

    When I had my throttle body and mass air sensor cleaned, the problem went away for a bit, but then came back again. I'm still at the point of having the rough idle at a stop light when the car is hot every now and then, but so far, thankfully, it has not stalled or triggered a code. I off set...
  10. Active Exhaust Broken?

    I found this posted by HollowKEYS in February. Active Exhaust Actuators: JR3Z-5K245-B And the Active Exhaust Pigtail harness: JR3Z-14A411-H
  11. RPM drops on 2019 GT

    Does anyone know if this low idle / stalling happens on all S550 Mustangs over-time or only on a select few?
  12. Stumble / Occasional Stall at Idle

    The problem with dealers today is that if the car does not show a code, they will not bother doing any further diagnostic testing. From what I remember reading on here, changing out the VCT solenoids is an easier job than the cam phasers.
  13. Stumble / Occasional Stall at Idle

    I have this issue on my 2020 California Special. Like others have said, it mostly happens when the car is hot and stopped at a red light. Sometimes, it will happen a few days in a row, and then not show-up again for weeks. Luckily, mine has not stalled yet. When it happens on mine, the idle...
  14. Experience after 4 years, 40k miles

    I understand your frustration. I question the quality of American cars these days. The last 3 cars I have owned were: 2013 2SS Camaro - Not one thing went wrong with that car. I traded it in because the 5 year powertrain was up. 2018 2SS Camaro - worst car I ever owned. Six things went wrong...
  15. New TSB issued for 2020 Mustang 5.0L Built September 1 - December 1, 2020

    Terry, I forgot all about this thread and then I saw you posted on here. Please post how long it takes them to do the cylinder head replacement.
  16. 2021 10R80 Shifting Questions

    Jason, I have a 2020 Mustang Auto GT Premium. When I drive in Normal mode, my biggest complaint is it stays in too high of a gear and it feels like the car is bogging when I step on it. I don't think the lugging will hurt the transmission since its just following the stock, factory tune. What...
  17. 10R80 Owners - ULTIMATE M6G 10R80 Facts + Resolutions to harsh or no shift conditions

    How long did it take the mechanic to change the valve body? Is it an all day job or two-day job? Thanks!
  18. RPM drops on 2019 GT

    Update and possible band-aid solution. Guys, I continue to have the idle issue show-up randomly at a red light. Thankfully, it still has not stalled or triggered any codes. The last few times it has happened, I was able to counteract the idle drop by immediately putting the AC on. When the AC...
  19. Rough idle (RPM constant dropping from 700 to 300) when the AC is on [help]

    When my AC is on, my idle is higher. It also offsets the idle drop. Hmm, do you think the custom tune and no catalytic converters leaned out your air/fuel ratio and fried your spark plugs over time? No sense in changing the spark plugs if the tune is off.
  20. Rough idle (RPM constant dropping from 700 to 300) when the AC is on [help]

    No, I have not watched the vacuum gauge when it happens. It just happened to me before. The car began to shake and I put the AC on, and it went away:) It's a shame how these dealerships are. My rear rotor is grooved and marked. Yet, the other three are spotless. They refuse to change it for me...
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