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Old 06-04-2012, 10:08 AM   #1
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Mustang idle

Why my mustang idle is not stable when i switch the ac in or w/o ac in cold start?? Its like moving from 6000 rpm to 8000 going up and down ... Did u guys had this issue before? My car is 5.0 2011 A6 non tuned ..bone stock

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Old 06-04-2012, 10:21 AM   #2
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It is actually very common. Its in the cam timing. Both my cars have don't this.

---------- Post added at 10:21 AM ---------- Previous post was at 10:20 AM ----------

But not 6000-8000. Do you mean 600-800?. If so your fine.
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Old 06-04-2012, 10:41 AM   #3
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Re: Mustang idle

Mine does this too, nothing to worry about. Definitely 600-800 RPM, not 6000-8000 (that would be some intense idling).
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Old 06-04-2012, 02:02 PM   #4
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Oh ok so its normal
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Old 06-05-2012, 03:47 AM   #5
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Mine use to do this but I took it to the dealer and had them do the updated callibration tsb and now it idles smooth.
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Old 06-05-2012, 04:32 AM   #6
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Grrrrrrrr... I brought that up to the dealer when I took it in for service. Those jerks told me it was normal. :/ I'm gonna take it back!
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Old 06-05-2012, 08:35 AM   #7
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Have you tried the idle re-learn?

Disconnect NEG from battery for 30min

Reconnect and start car, let idle as eng gets to operating temp. Let it idle a little over a minute

Turn on A/C to MAX, let idle little over a minute, turn off A/C

Then drive the car for at least 10 miles

Made a huge difference for me, even though I have a 04 Mach1. I hear this is more commonly needed on the new 5.0's.

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Old 06-05-2012, 11:47 AM   #8
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At the ford dealer the mechanic told me that its not good to disconnect the neg terminal on the 5.0s he said the computers in the car forget how to comunicate with eachother i dont no what he was talking about to be honest lol is this true?
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Old 06-05-2012, 11:57 AM   #9
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Originally Posted by GE3G
At the ford dealer the mechanic told me that its not good to disconnect the neg terminal on the 5.0s he said the computers in the car forget how to comunicate with eachother i dont no what he was talking about to be honest lol is this true?
Never heard of that.
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Old 06-05-2012, 08:04 PM   #10
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Re: Mustang idle

So I have a 2019 4.6L, drill under warranty. Do you think this is covered under warranty? Mine does the same up n down idle with AC on!!!
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Old 06-05-2012, 08:32 PM   #11
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So I have a 2019 4.6L, drill under warranty. Do you think this is covered under warranty? Mine does the same up n down idle with AC on!!!
You have a 2019....lol
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Old 06-05-2012, 09:28 PM   #12
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Quote:
Originally Posted by Azure
Have you tried the idle re-learn?

Disconnect NEG from battery for 30min

Reconnect and start car, let idle as eng gets to operating temp. Let it idle a little over a minute

Turn on A/C to MAX, let idle little over a minute, turn off A/C

Then drive the car for at least 10 miles

Made a huge difference for me, even though I have a 04 Mach1. I hear this is more commonly needed on the new 5.0's.

Do this ^^^
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Old 06-05-2012, 10:06 PM   #13
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Originally Posted by wnt2gofst

You have a 2019....lol
Lol. I was like, wow, not only does he have a future car but they go back to the 4.6 lol
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Old 06-05-2012, 10:55 PM   #14
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Lol. I was like, wow, not only does he have a future car but they go back to the 4.6 lol
Right..
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Old 06-06-2012, 05:14 AM   #15
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Re: Mustang idle

OMG, I must have some really fat fingers on my iPhone! LMAO. Well, I am a futurist after all. I'm driving a car that is still a concept, a 1 of 1, one of a kind, MINE!
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Old 06-06-2012, 11:40 AM   #16
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I hope the 2019s look better than all the 2015 concepts I've seen. Lol
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Old 06-09-2012, 02:41 AM   #17
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I hope the 2019s look better than all the 2015 concepts I've seen. Lol
+1 I was thinking of getting my first 5.0 as a 2015 model but looking at those concepts.... Idk.
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