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Old 09-29-2014, 05:30 PM   #1
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Idle help

Hi guys,

I am experiencing some weird idle with my car, is a v6 2014.

The problem is that when the car is on D idling with the a/c on you can feel like some sort of vibration on the steering wheel, driver seat and gas pedal. When i turn the ac off the car idles just perfect. The problem is only with the ac on.

Also you can hear when the ac compressor turn on and as soon it turns on boom there is the vibration, then it goes off and the car goes back to normal and after a few second the compressor kicks in again and the vibration too.

This is driving me nuts lol does all mustangs do that or is there something wrong with mine? Btw I have 10k miles and the only modifications are, gt500 exhaust, c&n intake. My car is not tuned.


Any advise please

Thanks guys


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Old 09-29-2014, 05:35 PM   #2
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Originally Posted by Ranger052 View Post
Hi guys,

I am experiencing some weird idle with my car, is a v6 2014.

The problem is that when the car is on D idling with the a/c on you can feel like some sort of vibration on the steering wheel, driver seat and gas pedal. When i turn the ac off the car idles just perfect. The problem is only with the ac on.

Also you can hear when the ac compressor turn on and as soon it turns on boom there is the vibration, then it goes off and the car goes back to normal and after a few second the compressor kicks in again and the vibration too.

This is driving me nuts lol does all mustangs do that or is there something wrong with mine? Btw I have 10k miles and the only modifications are, gt500 exhaust, c&n intake. My car is not tuned.


Any advise please

Thanks guys


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What is "when on D"? I think it's normal. Engine works harder w ac on, so it feels like it's shaking.


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Old 09-29-2014, 05:37 PM   #3
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When the transmission is on D while waiting for the red light to turn green.


So do you think that is normal? Does your car does the same?


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Old 09-29-2014, 06:05 PM   #4
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Some cars will actually have the idle raise a few hundred rpm when the AC compressor comes on to compensate for the load. It is normal, as long as its minor, and not shaking like you got 2 15"s in the back.
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Old 09-29-2014, 06:24 PM   #5
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Has this been going on for a while or only recently? What Voltwings said is true but it doesn't get to the point of a noticeable vibration in my car. You might just have a bad tank of gas if it's only been happening since your last fill up.

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Old 09-29-2014, 07:00 PM   #6
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It has been happening for about 6 months now but i was used to it till yesterday i drove my father's car and i was like wtf this car doesnt shake nor vibrate at idle


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Old 09-29-2014, 07:05 PM   #7
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Gotta say it does not happen on mine. 7 weeks old, 1600 miles. I can feel the compressor kick in but no vibrations as you describe or rpm changes.
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Old 09-29-2014, 07:06 PM   #8
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My rpm doesnt change, all i feel is the vibration


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Old 09-29-2014, 07:31 PM   #9
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Quote:
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My rpm doesnt change, all i feel is the vibration


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How long have you had your gt500 exhaust and c&n intake installed. The reason I ask is I noticed when I installed my Borla muffler the idle dropped for a day or so before the car came back to normal. Weird!
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Old 09-29-2014, 07:32 PM   #10
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Intake 7 months and exhaust 3 months


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Old 09-30-2014, 11:24 AM   #11
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look in your manual for idle relearn and try that.
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Old 09-30-2014, 11:31 AM   #12
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I already tried that and still the same. I have noticed that when i turn the ac on the rpm doesn't move at all so maybe my car is not compensating the load of the ac.


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Old 10-02-2014, 10:14 AM   #13
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If it's only for a couple of seconds each time AC kicks on/off I would ignore it. It may be it just takes time to compensate for the extra load. I didn't notice this with mine but don't often run AC
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Old 10-02-2014, 05:48 PM   #14
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The weird thing is that i hear a vibration noise coming from the engine. I will put back my oem i take to see because maybe intake shield is the one vibrating agains something.




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Old 10-02-2014, 06:49 PM   #15
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Idle help

Took mine into Ford for this. Said it was normal. Know it's not the answer you're looking for, but thought I'd share.


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Old 10-02-2014, 06:53 PM   #16
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Took mine into Ford for this. Said it was normal. Know it's not the answer you're looking for, but thought I'd share.


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Should have asked if you don't get it, is that abnormal?
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Old 10-02-2014, 07:35 PM   #17
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My car started shaking with the stock tune, took it to Ford, they said it was normal. AC on or off, the car would shake pretty good and rattle whatever was in the cupholders.

The stock idle is about 650, and it would meander between 620-660. Anything under 640 the car shakes. Told the dealer this, that I know it only shakes when it goes below 640 rpm and they said "I wish we could fix that but there isn't anything we can do."

Put a tune on the car, up the idle to 750, and no more shaking, ever.
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Old 10-02-2014, 08:45 PM   #18
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You would think for $35k it would purr...


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Old 10-02-2014, 11:09 PM   #19
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we have a very taxing ac compressor for whatever reason. it happens on my dads '12 and my '14. there both manual too so when we drive it defiantly is a noticeable power drain

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Old 10-02-2014, 11:20 PM   #20
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Idle help

I haven't experienced this and I've had my 2014 for over a year. This doesn't sound all that healthy, but Ford isn't going to do anything for you. I've taken my car in for small things here and there and every time it's "normal." Okay Ford technician guy. Okay. My Honda did shake like this though. Like really bad. But it still runs to this day... So hey, your Mustang runs like a 1998 Honda Accord. Hahaha
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Old 10-03-2014, 11:42 PM   #21
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My car started shaking with the stock tune, took it to Ford, they said it was normal. AC on or off, the car would shake pretty good and rattle whatever was in the cupholders.

The stock idle is about 650, and it would meander between 620-660. Anything under 640 the car shakes. Told the dealer this, that I know it only shakes when it goes below 640 rpm and they said "I wish we could fix that but there isn't anything we can do."

Put a tune on the car, up the idle to 750, and no more shaking, ever.

Yep, a few people have told me that, to get a tune and increase the idle rpm. I think i will do that.


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Old 10-04-2014, 06:11 PM   #22
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My car started shaking with the stock tune, took it to Ford, they said it was normal. AC on or off, the car would shake pretty good and rattle whatever was in the cupholders.

The stock idle is about 650, and it would meander between 620-660. Anything under 640 the car shakes. Told the dealer this, that I know it only shakes when it goes below 640 rpm and they said "I wish we could fix that but there isn't anything we can do."

Put a tune on the car, up the idle to 750, and no more shaking, ever.
If I cold start the engine and didn't do anything (a/c off), after about 5 mins it will start shaking. But, once I start driving, everything seems normal, no more shaking on red light. maybe next time I will keep eyes on the rpm, it's probably under 640 I think.
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