2012 Mustang Gt Surging Idle

Fireball906

New Member

Jul 28, 2011

6

0

1

Rio Rancho, NM

Jun 30, 2012

#1

• Jun 30, 2012

• #1

Have a 2012 Mustang Gt with a manual trans, the idle surges between 500-750 rpms, doesn't matter if the a/c is on or off, does it after running on for more than 10 minutes, took to local Ford dealer, they called Ford and said because it is a manual there is not enough of a load on the engine to keep the idle smooth.
Wondering if anyone has an auto trans that does not surge or a manual that does the same??

 

Clair Smith

Active Member

Apr 4, 2012

186

13

29

Norfolk Va

Jul 2, 2012

#2

• Jul 2, 2012

• #2

Fireball906 said:

Have a 2012 Mustang Gt with a manual trans, the idle surges between 500-750 rpms, doesn't matter if the a/c is on or off, does it after running on for more than 10 minutes, took to local Ford dealer, they called Ford and said because it is a manual there is not enough of a load on the engine to keep the idle smooth.
Wondering if anyone has an auto trans that does not surge or a manual that does the same??

Click to expand...

Nope, my 2012 GT manual idles super smooth, no issues what so ever.

 

Bojingles

Well-Known Member

May 10, 2012

329

35

63

Barksdale AFB, LA

Jul 2, 2012

#3

• Jul 2, 2012

• #3

Sure it's not the load on the alternator from when the fans turn on?

 

Fireball906

New Member

Jul 28, 2011

6

0

1

Rio Rancho, NM

Jul 12, 2012

#4

• Jul 12, 2012

• #4

It doesn't matter if I have the a/c on or off, even happens after the high idle warm up just after start up, very little but still happens. Just had a CEL/MIL on for the cam position sensors overretarded, Found a connector loose but it did not change the idle. All I have changed as far as performance is a Roush axle back with the square tips. No tuning

 

Bojingles

Well-Known Member

May 10, 2012

329

35

63

Barksdale AFB, LA

Jul 12, 2012

#5

• Jul 12, 2012

• #5

Don't call your car retarded... That's not nice... I wouldn't worry about it honestly. How many miles do you have on the car anyways?

 

SB_2008_GT

New Member

Jul 1, 2012

14

0

1

West Hollywood

Jul 14, 2012

#6

• Jul 14, 2012

• #6

My 2008 GT surges slightly if the A/C is on. After owning 4 previous mustangs (all manuals) this is a very common issue.

 

D

ddec74

New Member

Jun 28, 2010

22

0

2

Jun 23, 2015

#7

• Jun 23, 2015

• #7

I have the same problem with mine, started after I installed long tubes...
had a custom tune put in it but still does it, even shuts off once in a while,
no CEL, and runs great