Is this normal for my 13 V6 to be doing this? - Mustang Evolution

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Old 10-05-2015, 10:11 AM   #1
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Is this normal for my 13 V6 to be doing this?

have a 2013 mustang v6 with about 38k miles. Automatic. When im driving lets say in a parking lot I let off the gas anf the engine rpms kinda stay right where they were before I let off. They do get lower very slowly. But when I hit tye brake they lower alot obviously. Is this normal for the rpms to stay arounf where they were before letting off?

Also im hearing a rear end clunk when accelerating from a stop or roll. The ford tech said its differential backlash and its normal by why would it be clunking?

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Old 10-05-2015, 10:18 AM   #2
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Are you on the stock tune? Sounds like the engine braking feature MPT had on our old automatic. If thats the case, its normal.
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Old 10-05-2015, 10:36 AM   #3
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Are you on the stock tune? Sounds like the engine braking feature MPT had on our old automatic. If thats the case, its normal.
Yes stock. The only mods is a roush cold air intake and ford racing exhaust. So your saying it sorta brakes by itself?

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Old 10-05-2015, 10:58 AM   #4
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idk about in an automatic, but in my manual V6 there is a lot of engine hang time after getting off the gas. I remember someone saying it was for emissions reasons but idk.
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Old 10-05-2015, 11:01 AM   #5
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Yes stock. The only mods is a roush cold air intake and ford racing exhaust. So your saying it sorta brakes by itself?

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When tuned, on the stock tune im not sure.
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Old 10-05-2015, 02:07 PM   #6
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My stock tune never did this but I noticed it instantly when I put on my Bama Race tune, kind of annoys me that is stays revving though.


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Old 10-05-2015, 03:18 PM   #7
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idk about in an automatic, but in my manual V6 there is a lot of engine hang time after getting off the gas. I remember someone saying it was for emissions reasons but idk.
yep that's how it is for me too. it's an emissions thing

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Old 10-05-2015, 03:26 PM   #8
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yep that's how it is for me too. it's an emissions thing

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So I'm guessing my idle air control valve is working fine and all this is normal? I never have had any check engine lights on

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Old 10-05-2015, 03:27 PM   #9
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So I'm guessing my idle air control valve is working fine and all this is normal? I never have had any check engine lights on

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So this is normal? I have never had any check engine lights. People have said it could be the iac valve or a vacuum leak





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idk about in an automatic, but in my manual V6 there is a lot of engine hang time after getting off the gas. I remember someone saying it was for emissions reasons but idk.


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Old 10-05-2015, 04:17 PM   #10
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I'd bet a beverage normal...but, describe what you meant by slowly. A few seconds or minutes?
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Old 10-05-2015, 05:09 PM   #11
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Mine is a 14 automatic and it only does that when it is cold


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Old 10-05-2015, 10:09 PM   #12
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So I'm guessing my idle air control valve is working fine and all this is normal? I never have had any check engine lights on

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Your "idle air control valve" is otherwise known as the throttle body. The computer controls it at idle. It is one of the advantages of "drive by wire" technology, no need for a seperate idle air system.
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Old 10-05-2015, 10:43 PM   #13
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FORD has a TSB regarding rear-end noise.
http://api.viglink.com/api/click?for...%2FRecallsPage
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Old 10-08-2015, 01:20 AM   #14
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About the rear end noise, it's normal unfortunately, due to the extra play in the two piece driveshaft. NOTE - check your pinion seal on the diff as that extra play can cause it to go bad - it's a known issue with the V6s. Mine went out at about 34K. Blew oil all over the place (slow leak, thankfully) but I caught it in time.
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Old 10-10-2015, 09:50 PM   #15
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About the rear end noise, it's normal unfortunately, due to the extra play in the two piece driveshaft. NOTE - check your pinion seal on the diff as that extra play can cause it to go bad - it's a known issue with the V6s. Mine went out at about 34K. Blew oil all over the place (slow leak, thankfully) but I caught it in time.
I actually had a pinion seal leak before. When im sitting in traffic on the hwy when I have to let off the brake then give it gas ever so slightly to move foward in trsffic I hear that clunk everytime

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