3500-4500 hesitation? - Mustang Evolution

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Old 05-10-2015, 07:45 AM   #1
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3500-4500 hesitation?

when I'm at full throttle at 3500-4500 rpm, the car hesitates for a few seconds, then picks up. 2011 gt, 57k miles, no engine mods. I searched the forums and found a guy with the same problem and it ended up being maf sensor, but at my relatively low miles is that unlikely? Any ideas?
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Old 05-10-2015, 12:05 PM   #2
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Make sure everything is tight and secure. During this amount of milage, i usually clean everything. Maf, throttle body, and anything else applicable.

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Old 05-10-2015, 12:09 PM   #3
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Also, is your car tuned? Cant see much on this Mustang app.

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Old 05-10-2015, 12:11 PM   #4
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Also, is your car tuned? Cant see much on this Mustang app.

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not tuned yet
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Old 05-10-2015, 12:20 PM   #5
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Any aftermarket intake? Sorry if this is redundant. Again, cannot see much on this app.

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Old 05-10-2015, 12:51 PM   #6
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Any aftermarket intake? Sorry if this is redundant. Again, cannot see much on this app.

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no engine mods, bone stock . i looked at the maf sensor, the center wire was amber the sides were silver.
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Old 05-10-2015, 12:54 PM   #7
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I believe the maf sensors on these cars are ok to use MAF cleaner on. Also, did you try pulling fuse 47 on your car or leave your battery unhooked for an hour? Could be with your ecu's learning, it has reached a more economical mode. Having the car relearn would be the next best thing.

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Old 05-10-2015, 04:50 PM   #8
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I was wishfully thinking that maybe getting a tune would eliminate the hesitation, and if not the datalogging feature would allow me to diagnose it, but I think that's more want than logic, LOL
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Old 05-10-2015, 04:54 PM   #9
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Yea. I would just turn the car off. Pull fuse 47 for about 15 min. Put it back in. And take it for a drive.

Because it could be a simple fix of clearing the cars learning. Or if that doesn't work, cleaning and checking components.

If all that fails, you could try a tune to see if that smooths it out. But I always start with the free and cheap fixes first.
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Old 05-11-2015, 02:30 PM   #10
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I have 65K miles on my car and i experience the same hesitation. I believe it's all in the conservative factory tune. In going to be putting a 91 Lund tune on soon. I'll let you know how it goes.
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Old 05-28-2015, 06:40 PM   #11
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My hesitation is gone with my new tune
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Old 05-28-2015, 07:04 PM   #12
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i cleaned the maf and throttle body, no improvement. im getting im taking it to a shop this week to have it checked out
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Old 05-28-2015, 07:22 PM   #13
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Did you try unhooking the battery for an hour or pull fuse 47 for 15 min? Try to get the car to relearn.
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Old 05-28-2015, 07:49 PM   #14
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Is pulling fuse 47 safe ? I thought I remembered someone on this forum saying it isn't but I may be wrong


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Old 05-28-2015, 07:52 PM   #15
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Is pulling fuse 47 safe ? I thought I remembered someone on this forum saying it isn't but I may be wrong


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After you have a tune you shouldn't
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Old 05-28-2015, 07:54 PM   #16
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Ok that's what I saw , I'm having the same hesitation problems and it definitely wasn't doing this 5,000 miles ago. Looks like it's time to tune


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Old 05-28-2015, 07:54 PM   #17
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I only suggested it because it sounded like OP did not have a tune just yet. If he did get one after I posted, my apologies. Sounded like he was stock.
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Old 05-28-2015, 07:57 PM   #18
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yes im stock, i may try the fuse before i take it in, either way ill keep you guys posted
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Old 05-29-2015, 12:37 PM   #19
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Does that fuse trick only work for autos or is it for manuals as well?


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Old 05-29-2015, 12:48 PM   #20
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Does that fuse trick only work for autos or is it for manuals as well?


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Fairly certain it only works for the auto.
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Old 05-29-2015, 12:49 PM   #21
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Does that fuse trick only work for autos or is it for manuals as well?


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Old 05-29-2015, 12:52 PM   #22
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For autos. Because it is meant to wipe the auto's shifting aggressiveness, throttle, and stuff so the car relearns everything. Whereas in a Manual, you control mostly everything.
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Old 05-29-2015, 08:49 PM   #23
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Does that fuse trick only work for autos or is it for manuals as well?


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Only for Autos. Pulling the fuse resets the Adaptive Shifting tables learned in the PCM.
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Old 05-30-2015, 09:48 AM   #24
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Works for manuals too, at least it did on my manual 3.7

Car would be slightly more responsive for about 2-3 days after fuse 47 pull. I just swapped tranny in my GT, going from auto to manual. I will keep you updated if this trick works on 5.0 as well

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Old 05-30-2015, 09:50 AM   #25
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PS: I even did a dyno run for fuse 47 pull while I was data logging for my tuners. Apparently the car ran slightly leaner (AFR was 13.6 vs 12.7 on other tunes), could explain why it used to feel more peppy

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Old 05-31-2015, 09:43 AM   #26
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well I got It fixed, the shop said they just needed to adjust the stock tune around that range, runs great now
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Old 05-31-2015, 10:29 AM   #27
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Umm can they adjust the stock tune? I thought you can't adjust stock ford tune by any means

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Old 05-31-2015, 10:33 AM   #28
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I was perplexed by that also, all i know is its fixed and they sold the the sct tuner they had to use to fix it. I guess now i can buy a tune at least
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Old 06-01-2015, 11:03 AM   #29
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What gear

Is the hesitation in all gears?
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Old 06-03-2015, 11:42 PM   #30
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Does it do it with traction control off? Or only when it's on?


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Old 06-04-2015, 03:15 AM   #31
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It was in all gears, traction control on or off
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Old 06-04-2015, 07:04 PM   #32
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I learned this here on this site about two years ago.
Try this: Key to On position, no engine start. Watch the engine light flashing and listen to the chime. When the engine light stops blinking and chime stops, press the throttle slowly to the floor and slowly back up. Watch the engine light flash again. When it stops, turn the key off. Wait a few seconds. Take it for a drive. This process resets some ECU parameters and allows it to re-learn your driving style.
If you ever notice when you drive aggressively more often, the car suddenly feels stronger. Same goes for putt-putting around town under 2500 rpm.
This process works really well on my 2012 GT Manual!
As I understand it, it basically does the same thing as disconnecting the battery for a couple of hours.
I am not sure if it works on auto's or other model Mustangs, but it won't hurt anything and it's worth a try.
Let us know if it works on your automatic car?
Good Luck
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Old 06-04-2015, 07:19 PM   #33
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Quote:
Originally Posted by Konawin View Post
I learned this here on this site about two years ago.
Try this: Key to On position, no engine start. Watch the engine light flashing and listen to the chime. When the engine light stops blinking and chime stops, press the throttle slowly to the floor and slowly back up. Watch the engine light flash again. When it stops, turn the key off. Wait a few seconds. Take it for a drive. This process resets some ECU parameters and allows it to re-learn your driving style.
If you ever notice when you drive aggressively more often, the car suddenly feels stronger. Same goes for putt-putting around town under 2500 rpm.
This process works really well on my 2012 GT Manual!
As I understand it, it basically does the same thing as disconnecting the battery for a couple of hours.
I am not sure if it works on auto's or other model Mustangs, but it won't hurt anything and it's worth a try.
Let us know if it works on your automatic car?
Good Luck
Or... you could just pull fuse 47 for 10-15 minutes if you have an automatic transmission.
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