DEAD spot in powerband, NEED HELP! - Mustang Evolution

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Old 11-03-2015, 07:08 PM   #1
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DEAD spot in powerband, NEED HELP!

hey everyone, as the title enthusiastically states, im finding a total dead spot in my power band. from 2k to 3400 i can floor it, car crawls. after it reaches around 3500 it lunges forward with full power
heres where im at thus far:
its not TCS/STC issue
its not the tune, its present stock and tuned. currently running bama 93, when calling them they confirmed my tune was spot on for the mods im running
really need help from anyone who may know whats going on, or suggestions to fix it
happens in every gear
thanks in advance everyone, as Robostang will attest, something is definitley up
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Old 11-03-2015, 07:37 PM   #2
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Check engine light?
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Old 11-03-2015, 07:48 PM   #3
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No cel, love your name by the way haha malibus most wanted is hilarious
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Old 11-03-2015, 07:51 PM   #4
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Have you tried disconnecting your battery for an hour and retrying?

Also maybe clean the tb and maf sensor. Make sure no hoses are pinched.

Does the car sputter or act weird at idle?
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Old 11-03-2015, 07:59 PM   #5
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Have you tried disconnecting your battery for an hour and retrying?

Also maybe clean the tb and maf sensor. Make sure no hoses are pinched.

Does the car sputter or act weird at idle?
Seems to idle smoothly at Around 650-700 when warm. Haven't pulled the battery yet. Would doing so or performing the gas pedal throttle reset technique jeapordize my tune? Ty for the feedback!
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Old 11-03-2015, 08:03 PM   #6
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Seems to idle smoothly at Around 650-700 when warm. Haven't pulled the battery yet. Would doing so or performing the gas pedal throttle reset technique jeapordize my tune? Ty for the feedback!
I took a ride with 2013GTpremium today and the car is definitely flat between 2k and 3500 rpm.

You might want to set the car back to stock before you disconnect the battery. An alternative to disconnecting the battery is to pull a fuse. I can't remember which one but someone will chime in or you can search it.

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Old 11-03-2015, 08:04 PM   #7
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Fuse 47. That is for the adaptive shifting and such. I would just rather disconnect the battery. Do revert to stock just to be safe.
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Old 11-03-2015, 08:17 PM   #8
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If that doesnt work, i have heard of faulty throttle bodies on the s197s kicking the car into limp mode.

Maybe keep the car on the stock tune, and if all else fails - take it to Ford if you have any "warranty" left to get it checked. Unless you have a friend that will let you swap stuff just to test.
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Old 11-03-2015, 08:19 PM   #9
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The bumper to bumper expired about 1100 miles ago of course. Previous owner was kind enough to run it to exhaustion. I'll do suggested ideas you guys mentioned, starting with the battery. And go from there !
Car pulls really hard once it wakes back up just wanna get this sorted
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Old 11-03-2015, 08:33 PM   #10
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Sounds good. Definitely make sure nothing is kinked, loose, or disconnected.
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Old 11-03-2015, 09:45 PM   #11
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Sounds like a tune issue. Frankly, there are lots of tunes that can pump up the limp bottom end on these cars. Go to the tuner and ask for a revision or pick a tuner that can do this for you, it's not hard.
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Old 11-03-2015, 09:52 PM   #12
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He said the issue was present while stock also.
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Old 11-03-2015, 09:53 PM   #13
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Well I think a datalog may help. Or at least the can see if there are any issues there op needs to take care if

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Old 11-03-2015, 10:31 PM   #14
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Yeah, these cars suck off the bottom end stock as well. A tune *should* fix this but maybe this one didn't.
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Old 11-04-2015, 02:19 PM   #15
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Originally Posted by 2013GTpremium View Post
The bumper to bumper expired about 1100 miles ago of course. Previous owner was kind enough to run it to exhaustion. I'll do suggested ideas you guys mentioned, starting with the battery. And go from there !
Car pulls really hard once it wakes back up just wanna get this sorted
The engine will be Warrantied for 5 yrs or 60 K. I believe this would fall into the emissions category. Make sure you go back to stock tune before going to Ford for service.
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Old 11-04-2015, 02:23 PM   #16
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I actually think I may have figured it out. I'll post results later when I can check
As for the returning to stock
Ford knows when you've put a tune. Even if returned to stock lol
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Old 11-04-2015, 02:34 PM   #17
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I actually think I may have figured it out. I'll post results later when I can check
As for the returning to stock
Ford knows when you've put a tune. Even if returned to stock lol
Very true, but doesnt always mean they will go nuts on you if they see it. Ask me how I know! lol
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Old 11-04-2015, 06:16 PM   #18
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Click image for larger version

Name:	ImageUploadedByMustang Evolution1446682476.320967.jpg
Views:	75
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ID:	193264

By dead spot I think he means what you see around the 3k rom area where torque is low then kicks in after 3500rpm.


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Old 11-04-2015, 06:29 PM   #19
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datalog this thing: TP (actual and commanded), timing advance, STFT, LTFT, KR, lambda or afr, rpm and vehicle speed.
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Old 11-04-2015, 06:30 PM   #20
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Gotcha. I thought he meant his car was going into a limp mode. My bad.
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Old 11-04-2015, 07:17 PM   #21
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Attachment 193264

By dead spot I think he means what you see around the 3k rom area where torque is low then kicks in after 3500rpm.


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Nah this was different. I appreciate your input but when I say dead spot, I mean foot to the floor and could get out run by a lady with a walker. Problem has since been corrected and I thank everyone for helping out. You're he best
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Old 11-04-2015, 07:19 PM   #22
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So what was the fix?
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Old 11-04-2015, 07:28 PM   #23
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So what was the fix?
I know I'm gonna get smoked for
This. Be gentle.

The damn Venturi tube was still there
Hear me out.

I'm coming from a 350z, never owned a stang or knew what I was looking for. It was dark out, looked into the tube and didn't see anything. Upon closer inspection after racking my brain I took a closer look and it was there
I'm begrudgingly posting in case any other noobs like me run into the same issue, lesson learned
I do appreciate everyone chiming in to help
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Old 11-04-2015, 07:34 PM   #24
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You can send some heat my way also. I was with 2013GTpremium when he looked inside the CAI. Unfortunately, I didn't bother to take a close look at the inside of the tube myself. If I had, we probably would have solved this problem a lot quicker. Anyway, looking forward to another ride in that beast now that it is sorted.
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Old 11-04-2015, 08:17 PM   #25
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man, don't worry, that doesn't even tweak my Stupid-o-Meter. glad it is solved!
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Old 11-05-2015, 12:11 PM   #26
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How do you know Kevin. I am hesitant to put a tune on my car. Afraid it will void my warranty
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Old 11-05-2015, 12:22 PM   #27
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They have to prove the tune caused the issue or was related. I took my car in because the ecu was messing up. It was tuned, but i put it back to stock before they towed it.

They had to reflash the ecu. The car wouldnt start or anything anymore. That fixed it. When they gave the car back, they didnt mention the tune or anything. And the reflash fee was waived.

I did check afterwards and the computer is still the same with the same strategy code. So my tunes were still valid.

Just be nice when you take your car in. I am sure if you are a d***, it wont help your chances.
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