2015 Mustamg GT Rough Idle and Egine Vibration - Mustang Evolution

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Old 07-02-2015, 10:44 PM   #1
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2015 Mustamg GT Rough Idle and Egine Vibration

Hey guys,

New owner of a 2015 GT manual transmission. I purchased mine June 21, 2015. Very happy with it and I have been driving it ever since I took it home. Yesterday morning, I started the engine as usual and immediately I felt a change in its idle characteristics. I can also feel the car shake side to side every 5 seconds or so and the exhaust note seem to have an additional "domp" or "womp" sound to it when this shaking occurs.

I pop the hood open and I can see the plastic engine cover vibrating but the actual engine itself not too much but I can still see it.

So I went back to my dealer yesterday. To my disappointment they blew me off and said if it's not throwing any CEL they can't do anything really.

I'm stomped. Is this even normal for a V8 engine after more than a week of use?
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Old 07-02-2015, 10:50 PM   #2
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Have them monitor your engine for misfires while it's running.


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Old 07-02-2015, 10:55 PM   #3
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By the way, it runs fantastic. When accelerating it is very smooth. Just on idle I can feel the car swaying side to side and the recaro seats I can see somehow getting the vibration too.
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Old 07-03-2015, 12:09 AM   #4
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Does the AC being on/off change anything?


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Old 07-03-2015, 12:32 AM   #5
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Does the AC being on/off change anything?


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Good question. It seems like the vibration goes away a little bit when the AC is on.

When I let it idle for a long time like 5 minutes or so, the vibration is much worst like the engine is going to die but it still continues to run.

I just scheduled an appointment tomorrow at my dealer. They blew me off when I went there yesterday maybe because there are customers in line but I just can't accept the fact that they wouldn't even spend 5 minutes to see what was going on.
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Old 07-03-2015, 12:58 AM   #6
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Bad or old gas? Cheap gas would also give you a rough idle.

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Old 07-03-2015, 08:57 AM   #7
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I had the same issue in my '14 and took it to my dealer who stated it was a product of "normal A/C condenser operation." I got the same response from another dealer when I went out of town for a second opinion. I can feel it in my '15 too, but it's rather tame compared to the '14.


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Old 07-03-2015, 11:24 AM   #8
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I had the same issue in my '14 and took it to my dealer who stated it was a product of "normal A/C condenser operation." I got the same response from another dealer when I went out of town for a second opinion. I can feel it in my '15 too, but it's rather tame compared to the '14.


5.OH
So do you feel that shake at idle too? Mine is like a cyclic interval and i can feel the car sway from side to side plus i can see the engine cover really vibrate. So weird. It's not throwing any codes either. It was so smooth on the first week then idle issues. Car runs fine.

I'm wondering if an idle relearn procedure would eliminate this issue.

Does anyone know if the idle relearn procedure for the 2015 is the same as the previous years?
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Old 07-03-2015, 11:42 AM   #9
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I'm certain I felt it on mine.


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Old 07-03-2015, 12:00 PM   #10
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I'm certain I felt it on mine.


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Hey GoldenCAMuscle,

Do you feel it all the time? I only have 340 miles on it.
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Old 07-03-2015, 12:12 PM   #11
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I have 2 k miles I do at times I heard people complain about it before.


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Old 07-04-2015, 11:57 PM   #12
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I have 2 k miles I do at times I heard people complain about it before.


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GoldenCaMuscle, I have been using 87 octane. Will I hurt anything if I use 93? I want to see if it smooths the idling.
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Old 07-05-2015, 05:47 AM   #13
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87 is fine unless you have a custom tune



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Old 07-13-2015, 04:10 AM   #14
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I have noticed it too op and i use 93 octane on mine. Are we suppose to be us 87? I read the manual and i am fairly certain it was saying 91 or above gas or i might have misread it as i spent 2 hrs reading about all different things.
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Old 07-13-2015, 04:28 AM   #15
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I have noticed it too op and i use 93 octane on mine. Are we suppose to be us 87? I read the manual and i am fairly certain it was saying 91 or above gas or i might have misread it as i spent 2 hrs reading about all different things.
Delear said they couldn't find anything wrong. I used to fill her up 87 but now I'm sticking to 93 because the vibration and shaking toned down significantly most especially after revving the engine.

I also saw a YouTube video where this guy is reviewing the '15 Mustang and on the engine bay part I can see the same symptoms of the engine. I guess this is normal.
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Old 07-13-2015, 05:48 AM   #16
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91-93 is also the recommended fuel for the 5.0


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Old 07-18-2015, 12:19 PM   #17
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Our 2015 GT only has 2,100 miles on it, but there is a huge difference between how the engine idles with 87 octane in it and 93.
87 octane lopes a little bit and you can feel it in the entire structure of the car. 93 octane, the idle is almost as smooth as silk. I also get about 4 mpg better on 93....even the sound of the exhaust system is different between the two octane levels, with the higher octane sounding MUCH better.
I wonder how far the engine retards the timing to avoid detonation when the octane level is so much lower?
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Old 07-18-2015, 01:25 PM   #18
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Just stick to 93, and good gas stations. For example I was putting 93 on Arco Ampm gas realized it wouldn't last. I recently put 93 on chevron and OMG I do not bs my car rides better and last much longer. These new mustang engines deserve the best now my 96 I could careless I put cheap gas haha.


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Old 07-25-2015, 07:18 AM   #19
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91 octane or higher is by ford the reccomended fuel of use.

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Old 07-25-2015, 01:07 PM   #20
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91 octane all the way ๐Ÿ˜€


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Old 07-26-2015, 10:38 AM   #21
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I usually use Costco's 93. They have high quality gas right?


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Old 07-26-2015, 11:49 AM   #22
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After looking at the 2015 maintenance schedule, it does in fact say 87 octane or higher. So I correct myself.

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Old 07-27-2015, 11:36 AM   #23
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Originally Posted by 99_GRUMPY_GT View Post
91 octane or higher is by ford the reccomended fuel of use.

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After looking at the 2015 maintenance schedule, it does in fact say 87 octane or higher. So I correct myself.

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Yea, you're right, it is 87 or higher, but at 11:1 compression you really should stick to 91 all the time.

I know I'll get some people riled up and tell me that's it's perfectly fine to run 87 because of the cam timing blahblahblah.

That's really just a safety net for those that don't want to run proper fuel in a high compression motor.


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Old 07-27-2015, 11:54 AM   #24
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GoldenCaMuscle, I have been using 87 octane. Will I hurt anything if I use 93? I want to see if it smooths the idling.
Ford says you can use 87 octane but best performance from 91/92 octane. I think the key here is "best performance". I would try the higher octane before doing anything else.... Also I would try to avoid cheaper fuel stations. Stick with Chevron, Shell, Mobile, Texaco.... Contrary to popular believe fuel is very very dirty stuff. Techron is good to run through you motor as often as you can, it makes everything slicker inside. This is all just my opinion of course.

Good luck
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Old 07-27-2015, 01:59 PM   #25
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I use 93 at all times regardless.

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Old 07-02-2016, 09:13 PM   #26
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year old thread....Any solutions/thoughts?

We have a 2016 GT/CS auto- and it's exhibiting a stumble while in park- AC on- noticed it at a few hundred miles and after driving 3K+ miles on the Hotrod Power Tour- it's still doing it. So-not bad gas- always run premium. Didn't matter who/what/where the gas was purchased -even the ethanol free stuff did it.

Actually sounds like a a blip in the ignition- at exactly every 10 seconds- you could set a watch with it- Seems as though the ignition is shutting down for a millisecond - yet the tach doesn't move at all.



Here's one of the places we bought gas- just north of Dallas- 112 gas pumps!!

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Old 07-03-2016, 04:37 AM   #27
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2015 Mustamg GT Rough Idle and Egine Vibration

Have you tried going to a reputable mechanic who can hook up to a computer/ scan device. If it's idling bad it will show up and what cylinder may have an issue. Or it will show that everything is running within parameters.


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Old 07-03-2016, 06:20 AM   #28
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Rich,

look in the manual for "idle re-learn" I doubt it's it but easy enuf to try. I will say for EPA numbers car mfrs try and keep idle speed as low as possible and they will try and lower rpms till it is on the edge of rough
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Old 07-03-2016, 06:53 PM   #29
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Rich,

look in the manual for "idle re-learn" I doubt it's it but easy enuf to try. I will say for EPA numbers car mfrs try and keep idle speed as low as possible and they will try and lower rpms till it is on the edge of rough


OK- I dug into it a little deeper.

Sitting in park-97ยบ AC running - it was very consistent 10.5 to 11 seconds. Started this cycle after about 1 minute. After about 7 minutes of the very consistent intervals- I switched the AC off for about a minute. NO burble/miss whatsoever- even when the fan kicked on. I switched the AC back after several minutes- and in just over a minute it was doing the same thing.

So I'm thinking it's in the software for emissions or to help out the MPG- thinking like you- Strange Mud.


Not going to worry about it- but thought I'd pass on my findings.

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Old 07-09-2016, 11:43 PM   #30
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There IS a 2015+ section on this site. It's not here. You should try it.


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Old 07-10-2016, 07:53 AM   #31
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There IS a 2015+ section on this site. It's not here. You should try it.


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I'll be reporting you right about now....


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