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Old 10-18-2014, 09:13 PM   #1
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Idle issue

My 2012 Mustang V6 has what maybe an Idle issue. When it is in idle and not moving, or barely moving, such as in backing out of a parking spot, the car will occasionally 'idle down' to the point the the car 'shudders' like a hard low idle for a couple of seconds, and then it will return to normal idle. It seems to be getting more and more often. I noticed that it is more pronounced when my a/c is on. Is this normal?
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Old 10-18-2014, 09:20 PM   #2
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Sounds like a vacuum leak to me.


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Old 10-19-2014, 12:38 AM   #3
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My 2012 Mustang V6 has what maybe an Idle issue. When it is in idle and not moving, or barely moving, such as in backing out of a parking spot, the car will occasionally 'idle down' to the point the the car 'shudders' like a hard low idle for a couple of seconds, and then it will return to normal idle. It seems to be getting more and more often. I noticed that it is more pronounced when my a/c is on. Is this normal?

Same issue here 2014 v6 with only 10k miles


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Old 10-19-2014, 12:47 PM   #4
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I've tried some different gas and it seems to help. Would gas play a part in this?



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Old 10-19-2014, 12:50 PM   #5
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I don't think so, i have tried all gas types and no luck lol

I have been tempted to put the oem intake back and see if that helps


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Old 10-19-2014, 12:59 PM   #6
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Are there any vacuum leaks with the aftermarket intake? If you switch it back and the problem is solved then that's what I would think the issue is.

Sticking idle air control valve?
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Old 10-19-2014, 01:03 PM   #7
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what mods do you guys have? I'm on the mobile site and can't see them. I have the same issue but I know it's from my shorty headers as it started after I put them on. I just haven't found the time to mess with it.
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Old 10-19-2014, 01:20 PM   #8
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No mods here all stock


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Old 10-19-2014, 01:42 PM   #9
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No mods here all stock

I would go see the dealer then. Let them take a look at it if you still under warranty. It's free so why not. Something may have been missed or not completely fastened from the factory.
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Old 10-19-2014, 01:43 PM   #10
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It's past warranty


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Old 10-19-2014, 01:50 PM   #11
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Same issue here 2014 v6 with only 10k miles


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Same issue here. 2014 base 6 speed with an air aid intake. I don't remember the car doing it with the stock intake in so it probably has something to do with that.
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Old 11-19-2014, 04:42 PM   #12
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I just installed the oem intake and i still get vibration at idle!!! I am starting to hate this car.

Here is a pic of where car idle at with a c on and transmission on D.

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Old 11-19-2014, 05:31 PM   #13
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This happens to me also at least once a day.
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Old 11-19-2014, 05:41 PM   #14
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Looks normal to me. I can tell when the compressor kicks on/off, is that what you're feeling?
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Old 11-19-2014, 05:42 PM   #15
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Maybe try a fuel cleaner the next time you fill up? Maybe your fuel filter is dirty or spark plugs may be fouled up?

I use STP full system cleaner (silver bottle). This has fixed CELs my wife got when putting bad gas in her car.
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Old 11-19-2014, 05:43 PM   #16
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You can get that fuel cleaner at wal mart or places like autozone. Like $5-$6 a bottle.
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Old 11-19-2014, 05:46 PM   #17
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I actually had this issue with my old 3000GT. Even though i replaced fuel filter, cleaned fuel system, put in new spark plugs, and cleaned throttle body. The issue was the idle air control valve was bad. Cant remember off the top of my head if these have one.
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Old 11-19-2014, 05:53 PM   #18
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I had this issue when the car was only 1 year old (it's 4 now) and have always been told "these engines just vibrate the car a little at idle". Which is BS, but whatever. Done the fuel cleaner, had multiple intakes and exhausts on the car... but one thing fixes it. Up the idle RPM from 650 to 700 and no more shakes.

Sure, you need a tuner to do this, I asked Ford to do it for me and they would not.
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Old 11-19-2014, 06:02 PM   #19
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Yes, every time the ac kick in i can feel all that vibration on the seats and steering wheel.

I was also told to buy a tune and raise the idle and to be honest i didnt want to because of my extended warranty but at this point i will ask for a refund of my extended warranty and buy a tuner.

Can any one post a pic of the idle after is was raise so I can have that as a reference?

Thanks guys


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Old 11-19-2014, 06:28 PM   #20
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Idle issue

How many miles? That may help people assist with diagnosing.
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Old 11-19-2014, 06:28 PM   #21
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1 year old, 10k miles


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Old 11-19-2014, 06:32 PM   #22
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Sometimes engine mounts can get worn depending on how hard you are on the engine.

Do you use the AC alot? If so, have you tried checking the refrigerant level as well as maybe the ac compressor getting checked?

When it comes to car shaking, there are alot of things that can cause it.

Vacuum leaks, bad ac compressor, bad gas, bad spark plugs, etc.

---------- Post added at 06:32 PM ---------- Previous post was at 06:31 PM ----------

Best to start with the cheapest fixes and work your way up.
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Old 11-19-2014, 06:37 PM   #23
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Well with 10k miles, i would make sure your throttle body isnt gunked up. Sometimes a little seafoam in the engine will help. I think around 10-15k miles is when you change the fuel filter. When was your last oil change?
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Old 11-19-2014, 06:39 PM   #24
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On these mustangs the iac valve is controlled by the ecu. So cleaning the throttle body and maf sensor may help.
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Old 11-19-2014, 06:56 PM   #25
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I didn't know that the fuel filter needs to be replace at 10k.

My last oil change was At 8K at the dealer.


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Old 11-19-2014, 06:58 PM   #26
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I cant remember if its at 10k or 15k. But if cleaning the maf sensor and throttle body doesnt work, then it could be something to try. I think a fuel filter runs $15-$25.
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Old 11-19-2014, 07:00 PM   #27
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Do i need anything special to clean the throttle body? Or just a clean towel?


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Old 11-19-2014, 07:10 PM   #28
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Auto places sell mass airflow sensor cleaner. I believe carb cleaner works also but check for the first one if possible.

---------- Post added at 07:10 PM ---------- Previous post was at 07:09 PM ----------

For the throttle carb cleaner works fine. The other post was for the maf sensor.
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Old 11-19-2014, 08:34 PM   #29
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I raised mine to 750 rpm, but I have turbos and large injectors. Try this sequence. The computer learns how to run the engine and I found this to work well.

On a cold morning start the engine without the a/c on and in neutral. Let it idle until it is completely warmed up (about 10 minutes or until the fan comes on). Then turn your a/c on and idle for another 2 or 3 minutes. Then take it out for a 10 mile drive.


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Old 11-19-2014, 08:49 PM   #30
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Will do buy the cleaner and will do the morning trick.
Thanks guys.

Question if any of that work and i raise the idle to like 700 or 750. Can it damage my engine over time or make the car waste more gas?

Thanks


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Old 11-19-2014, 08:56 PM   #31
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If all the cheap fixes dont work, you could disconnect the battery for an hour and then have the car relearn everything to see if that helps.
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Old 11-19-2014, 09:36 PM   #32
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I'm having same issues car idles and it seems like it wants to go off during a red light or something. I recently installed BBk shorty headers two weeks ago. any body figure it out?


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Old 11-19-2014, 10:09 PM   #33
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If all the cheap fixes dont work, you could disconnect the battery for an hour and then have the car relearn everything to see if that helps.

Will do that too


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---------- Post added at 10:09 PM ---------- Previous post was at 10:08 PM ----------

Quote:
Originally Posted by elkoritaNAY View Post
I'm having same issues car idles and it seems like it wants to go off during a red light or something. I recently installed BBk shorty headers two weeks ago. any body figure it out?


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In your case i believe is because the headers but in my case is weird because I am stock


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Old 11-19-2014, 10:19 PM   #34
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why the headers?


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Old 11-19-2014, 11:09 PM   #35
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No idea, thats what i have red online.




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