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Old 01-26-2016, 06:45 PM   #1
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Question on my 2013 GT

Being mustang owner few month now and not much experience with mustangs before.
When I'm at a red light at idle. I noticed a slight change on the rpms feels like dropping can't really see it its more like a feel kind of deal and hear a slight change on the sound hard to explain really have to be looking for it to notice it feels like if the car where going to stall but not as bad. It's this normal? Haven't driven any other mustangs so can't really tell if is normal

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Old 01-26-2016, 06:55 PM   #2
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You have a tachometer.........is the needle bouncing up and down? If not, then you just may be feeling the result of a pretty aggresive cam.
If your engine IS varying any significant rpm at idle, then no, that is not normal and needs addressing.
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Old 01-26-2016, 06:58 PM   #3
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You have a tachometer.........is the needle bouncing up and down? If not, then you just may be feeling the result of a pretty aggresive cam.
If your engine IS varying any significant rpm at idle, then no, that is not normal and needs addressing.
No needle won't shake or move when it happens it's so slight it can only be felt or heard and it last for like half second. Feels like a slight drop

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Old 01-26-2016, 07:02 PM   #4
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Also it doesn't do it constantly it happens maybe once or twice at Red light not at every stop that's why I was wondering if any other mustang owner have felt it might even be normal and I'm just being paranoid lol

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Old 01-26-2016, 08:09 PM   #5
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It's not abnormal. Probably just the ECU making a minor adjustment for who-knows-what?
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Old 01-27-2016, 12:23 AM   #6
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It is normal, Ford mentions this in the cars manual too.
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Old 01-27-2016, 12:26 AM   #7
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Yeah I get it too. It's normal. It doesn't happen on every red light. It happens less then a second.
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Old 01-27-2016, 05:34 AM   #8
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Alright thanks

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Old 01-27-2016, 05:39 AM   #9
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I believe it is a fuel conservation trick. It tries to idle as slowly as it can w/o roughness, but it will hit the rough edge sometimes.

As already said yep, it's normal.
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Old 01-29-2016, 07:21 AM   #10
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Mine has always been a bit rough at idle when cold, don't notice too much when warmed up, but I also do not typically drive in real cold weather due to salted roads.
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Old 01-30-2016, 08:08 AM   #11
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I kinda miss my stock 5.0. It was smooth as silk. Now she's like rough and loud as fawk.

But I can't say I've ever felt dips in rpm or ...... hmmmmm dunno if it actually happened or not but now after reading about it I think it happened a few times. Or maybe not.

Video maybe?


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Old 01-30-2016, 10:02 AM   #12
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As others have said, its the car trying to idle as low as possible to conserve fuel with out being rough. Sometimes its right at that edge, & the AC compressor kicks on & you might notice a little dip as AC compressor kicks in, etc..

If the RPM needle is not significantly moving up & down, there's nothing to be concerned about.

Its also probably more pronounced in cold weather, before the car is fully warmed up. Or if its so cold the car has trouble staying warmed up.
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Old 02-06-2016, 12:11 AM   #13
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I agree with c_rizzle, it is probably your compressor kicking on. Try shutting the AC system off and see if you still feel it. If it really makes you crazy you can always by a SCT tuner and then you can adjust your idle. I think it is programmed from the factory at 600rpm. I know I have mine set now at 700 and I like it better.


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Old 02-06-2016, 04:31 AM   #14
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Quick question... What's an AC?????


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Old 02-06-2016, 06:49 AM   #15
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Quote:
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Quick question... What's an AC?????


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Generally speaking, 220 - 221..... whatever it takes

=======================================

In your specific case, it might be the air conditioner.

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Old 02-07-2016, 06:07 AM   #16
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Quote:
Originally Posted by RWSRWS View Post
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Generally speaking, 220 - 221..... whatever it takes

=======================================

In your specific case, it might be the air conditioner.

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Ohhhhh the thingy that blows cold air thru those vent thingamajigs on the dash. Got it. I should test to make sure mine works just in case the windows fail. =P


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Old 02-07-2016, 03:22 PM   #17
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Maybe its just the fan turning on to cool the engine off? Are you driving with A/C on?
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Old 02-09-2016, 07:13 PM   #18
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Quote:
Originally Posted by afterdarkgt12 View Post
Maybe its just the fan turning on to cool the engine off? Are you driving with A/C on?
Fans are electric and shouldn't effect rpms.

The A/C compressor (or alternator) put a little bit of a load on the engine belt, and at very low rpms it could cause a little dip when they kick on.
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Old 02-09-2016, 08:48 PM   #19
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Yeah I see small dips now and then on mine. Nothing out of the normal from my car experience. Definitely if I hit the power windows it dips down but I have had that with my older cars and they did the same thing. My 98 v6 stang dropped way down on rpms at red lights. It was an automatic and if I dropped into neutral it went back up to normal idle situations, but it had a lot of miles. If it doesn't fluctuate a lot I think it's fine. But I'm no mechanic.


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Old 02-18-2016, 11:58 AM   #20
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Mine holds a slight high idle for a few seconds when I first stop sometimes, but it's visible on the tachometer. I think this has something to do with emissions as I've had other cars that do the same thing.
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Old 02-18-2016, 12:12 PM   #21
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I wouldn't worry about it unless you get a CEL, it runs rough/feels down on power, or it starts stalling. Maybe you can clean your MAF just to make sure, and make sure your engine air filter isn't clogged. The idle RPM can have slight changes due to various normal reasons
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