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Tuner Swap, and Long Distance on a New Mustang

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Old 05-14-2012, 07:13 AM   #1
GhostStrykre
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Default Tuner Swap, and Long Distance on a New Mustang

Hey everyone, I'm trading in my 2012 V6 Mustang for a 2012 5.0L V8 Mustang. I'm pretty stoked to do this, especially because I feel like I'm getting an incredible price.

My big questions are these though:

1) I always heard that driving a long distance at a constant speed (highway driving) is a bad idea in a new vehicle. Is this still true, even with current engine making technology? I'm driving the vehicle 8 hours from the dealer to home. Do I need to vary my speed on the highway to keep things together properly?

2) I have a tuner that I use on my V6. To unmarry this thing, all I need to do is plug it in to the V6 and revert it to stock and it's unmarried correct? Also, once it's reverted to stock, there's no way to tell the V6 was ever tuned right?

Thanks in advance!
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Old 05-14-2012, 09:33 AM   #2
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yes just use the return to stock on the tuner and it will unmarry the device from the car and can use on your new car. I am not sure if they can see if its ever been tuned but if there is nothing wrong with the car and your trading it in anyway what would it matter to you?
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Old 05-14-2012, 10:04 AM   #3
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They can tell if its been flashed if they look at the ECM. It keeps account of the number of times its been flashed and that can not be tampered with.
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Old 05-14-2012, 01:13 PM   #4
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yeah.. there's no problem with the car at all... car's actually fantastic. i always think it gets better every day i drive it (i'm still under 10k miles), and i think that's just the car continually breaking in. regardless, i was curious to know. i mean, i feel like im obligated to tell the dealer that the powertrain warranty is voided since it's been tuned. i'm sure that affects the price of the trade-in value. i'll cross that bridge when i come to it though.

i'm still researching whether or not its okay to drive long highway distances on a brand new vehicle though.
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Old 05-14-2012, 01:35 PM   #5
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yeah.. there's no problem with the car at all... car's actually fantastic. i always think it gets better every day i drive it (i'm still under 10k miles), and i think that's just the car continually breaking in. regardless, i was curious to know. i mean, i feel like im obligated to tell the dealer that the powertrain warranty is voided since it's been tuned. i'm sure that affects the price of the trade-in value. i'll cross that bridge when i come to it though.

i'm still researching whether or not its okay to drive long highway distances on a brand new vehicle though.
You are under no obligation to tell them that, especially since you are not the one to void the warranty, FoMoCo is. Since they have not done so, it is not voided, plain and simple. If the dealer, as part of the trade in inspection, determines that and decides to back out of the deal, that is on them. But regardless, I would not divulge what may not be true in the first place (that the warranty is void).

Regardless, good luck and post up pics.

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Old 05-14-2012, 05:06 PM   #6
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They can tell if its been flashed if they look at the ECM. It keeps account of the number of times its been flashed and that can not be tampered with.
this is simply not the case. will discuss in pm if you care too. flash will throw a p1000 code, but there is no "counter" the next one in just replaces the last one.

Last edited by SirJAG; 05-14-2012 at 05:14 PM. Reason: *dont want to stir pot...
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Old 05-14-2012, 06:56 PM   #7
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this is simply not the case. will discuss in pm if you care too. flash will throw a p1000 code, but there is no "counter" the next one in just replaces the last one.
Yeah, I'd love a technical explanation via a PM. I had always been told to flash to stock, then disconnect the battery for 30 min and then reconnect and drive. But, I'm no expert so I wouldn't be surprised if I'm wrong.
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Old 05-15-2012, 05:33 PM   #8
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i'm still researching whether or not its okay to drive long highway distances on a brand new vehicle though.
Well why the hell wouldn't it be okay?
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this is simply not the case. will discuss in pm if you care too. flash will throw a p1000 code, but there is no "counter" the next one in just replaces the last one.
Actually he is correct.
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Old 05-15-2012, 06:07 PM   #9
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I have read from numerous resources (from the interwebs so probably not accurate) that you shouldn't drive too long of distances. Something about taking frequent breaks and varying RPMs and seating rings and what not. Could you shed some more light on this please?
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Old 05-15-2012, 09:13 PM   #10
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To the ECM flashing, there is an engine start/stop counter that gets reset as one method to determine if it has been reflashed. Ford, not the dealer, can determine if the ECM has been flashed.

So far the research for breaking in the 5.0 engines shows to run them hard during the break in period for better results. I think AM has this documented (10-20 hp difference between a DD car and a "test" car after breaking in) Driving it long distance first off isn't going to hurt it (1-1000 miles). I doubt your speed will stay constant in any area other than Montana anyway. I also doubt you will go the speed limit on your maiden voyage either so it will take care of itself.
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Old 05-15-2012, 09:23 PM   #11
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To the ECM flashing, there is an engine start/stop counter that gets reset as one method to determine if it has been reflashed. Ford, not the dealer, can determine if the ECM has been flashed.

So far the research for breaking in the 5.0 engines shows to run them hard during the break in period for better results. I think AM has this documented (10-20 hp difference between a DD car and a "test" car after breaking in) Driving it long distance first off isn't going to hurt it (1-1000 miles). I doubt your speed will stay constant in any area other than Montana anyway. I also doubt you will go the speed limit on your maiden voyage either so it will take care of itself.
Lol west Texas eats up about 800 miles of unchanged speed limits. but i will change it up and do some rolls against myself haha. Thanks for the information!
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Old 05-15-2012, 09:48 PM   #12
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I've ran mine hard since day 1.
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Old 05-16-2012, 12:32 AM   #13
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you can take a look at the manual before leaving the dealership, im pretty sure it says to not drive for extended periods at the same speed for the first 500 miles.

and SirJag, the counter for PCM flash is new for 2011+ models... it exists and is readable by FoMoCo. Unless you work for them and have info saying they are just lying to the people who have been denied warranty after returning it to stock due to the # of pcm flashes.
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Old 05-16-2012, 08:30 AM   #14
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yeah, i just remembered reading about new vehicles wearing certain gear patterns unevenly if you are in, say, 6th gear for 800 miles on the highway. now, that info was based on experiences with vehicles in the 90s, so there was a lot of debate on whether or not it still applied to newer vehicles (i.e., 2011 and up) since engine manufacturing has changed so much for the better. it just sounds like i'll have to cycle through 4th, 5th, and 6th gear on the highway.

i just had this thought though. if Ford has to prove that it was the TUNER that caused something to go wrong in the engine, then i should be good since i've reverted back to stock and NOTHING is wrong with the engine.

to restate that: my mustang v6 is running like a champ, better than the day i bought it, in fact. i reverted back to stock and have been driving it for a couple days. i'll add another 500+ miles before i get it to the dealership in Baltimore. so, if there's nothing wrong with the engine when i trade it in, then the warranty should be intact, correct? because if anything goes wrong, it wasn't the tuner. because the tuner isn't there anymore and the car is fine. i understand that they could argue that the tuner did something that took a while to break the engine, but legally that's a rough uphill battle for them.. i would think.. is my thinking legit here? or totally flawed? haha
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Old 05-16-2012, 08:35 AM   #15
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I dont get why your making a big deal about this tuner thing and trading in..if the car is fine who cares. I traded my GT in and I took my tuner off it an the car was 100% perfect I didnt tell them anything and I didnt careless. i gave them a perfectly fine car and its not my problem once I sign the papers. Dealers screw you everytime you buy a car so why are you trying to give them a bigger upper hand on you. personally I enjoy getting over on them. say here is my car..let them look at it and done. I traded my GF jeep in with a trashed tranny for her new car. They didnt notice it and I wasnt telling them so its not my problem they didnt go over it enough to find it and they gave me more then i was expecting. Signed the papers walked out and it was their problem now.
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Old 05-16-2012, 10:37 AM   #16
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I dont get why your making a big deal about this tuner thing and trading in..if the car is fine who cares. I traded my GT in and I took my tuner off it an the car was 100% perfect I didnt tell them anything and I didnt careless. i gave them a perfectly fine car and its not my problem once I sign the papers. Dealers screw you everytime you buy a car so why are you trying to give them a bigger upper hand on you. personally I enjoy getting over on them. say here is my car..let them look at it and done. I traded my GF jeep in with a trashed tranny for her new car. They didnt notice it and I wasnt telling them so its not my problem they didnt go over it enough to find it and they gave me more then i was expecting. Signed the papers walked out and it was their problem now.
don't get me wrong here, but i wouldn't say i'm making a big deal about this. at this point i think this thread has morphed more into a discussion since A) the warranty is there, or B) it isn't. it doesn't really change what i'm doing. also, and this isn't your fault because i didn't mention this, but my father-in-law is considering buying my V6 off me. he's always wanted a mustang again (he grew up on a 1965 mustang and had to trade it in when he got married). so this warranty or no warranty discussion is valuable to me so i know what i should mention to my father-in-law so he knows what he's purchasing.

i think we all enjoy pulling a fast one on a dealer since they so frequently bend us over a barrel, but at this point there's more benefit to take from this thread if we follow the tuning/warranty subject to its conclusion. people in different situations could benefit a lot from knowing, not just me. all these reasons are why i'm still searchings for answers where i can.
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Old 05-16-2012, 11:21 AM   #17
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this is simply not the case. will discuss in pm if you care too. flash will throw a p1000 code, but there is no "counter" the next one in just replaces the last one.
2010-earlier Mustangs will not show anything other than P1000 code, which can be eliminated by completing the drive cycle (about 50 miles of mixed driving).

2011-later Mustangs will show both a P1000 and a checksum value left behind that indicates that it's been flashed.

The best thing to do is just always be honest with the dealer. They'll hook you up if you don't try and pull one over on them.
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Old 05-16-2012, 11:21 AM
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