Hesitation on Takeoff

glewis29

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May 4, 2006
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jupiter.evolveit.com
I was reading a different thread where Jimp stated that getting a good tuner mod can get rid of the 'dreaded hesitation on takeoff'. A couple times while pushing the Mustang hard on takeoff I've gotten some hesitation... it almost feels like the motor is about to die.

Does anyone know if this is definitely an 05-06 tuning problem, or is there possibly something else wrong? Any ideas specifically what would be causing the problem?

Thanks,
 
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Excepcion13

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Sep 16, 2005
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Northern Virginia
glewis29 said:
I was reading a different thread where Jimp stated that getting a good tuner mod can get rid of the 'dreaded hesitation on takeoff'. A couple times while pushing the Mustang hard on takeoff I've gotten some hesitation... it almost feels like the motor is about to die.

Does anyone know if this is definitely an 05-06 tuning problem, or is there possibly something else wrong? Any ideas specifically what would be causing the problem?

Thanks,
There is throttle delay without a tuner. If you have a 5 speed, it is not as noticeable from a take-off. Do you have traction control? This can affect a hard launch, actually causing the car to shudder. Turn off the TCS, gun it from a stop, and see what happens (besides a one wheel burn out if you are lucky!). The engine shouldn't "feel like it is dying."

Is the car stock?
 

dhthomas40

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Feb 13, 2006
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glewis29 said:
I was reading a different thread where Jimp stated that getting a good tuner mod can get rid of the 'dreaded hesitation on takeoff'. A couple times while pushing the Mustang hard on takeoff I've gotten some hesitation... it almost feels like the motor is about to die.

Does anyone know if this is definitely an 05-06 tuning problem, or is there possibly something else wrong? Any ideas specifically what would be causing the problem?

Thanks,
 

glewis29

New Member
May 4, 2006
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jupiter.evolveit.com
It is a stock 5 speed pony package automatic. I might be able to make a video, but so far it's only happened twice in about 4 months so I'm not entirely sure I can replicate it.

Once was right after I bought the car, I was getting off the freeway and turning right. I didn't gun it or anything that time. My thought was maybe it was just the computer 'learning' the right settings. The second time was on an older paved road, and I floored it.

In both cases I could see it being the traction control maybe... perhaps the first I was going through some water on the right turn, the second there could have been a fair amount of dirt on the road. Would the traction control have that dramatic of an effect though?

I'll play around with it a bit more and see what I can find.

Another way to describe it is as kind of a stuttering. My 65 Mustang used to do it if I gave it too much gas, so my instinctive reaction is to immediately take my foot off the gas. If I can get it to repeat I'll see how it responds to keeping it floored.
 

gbw1229

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Jun 8, 2006
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GOOD NEWS ON STALL / HESITATE

GOOD NEWS FOR THE MUSTANG PEOPLE. :flag:
If you have experienced a slight stall or hesitate on take off after driving your mustang for over 30 minutes, long distance driving, or after your mustang is hot, then I have good news for you. Ford has found the problem, The problem is on a new TSB that just came out and the problem is in the fuel pump. My dealership service department has already ordered mine as of today (June 8, 2006). Here is the Ford Part Number 7R3Z-9H307-C it's called a sender and pump unit. I do not have the TSB number but all dealerships should have the TSB on hand for you to read. I have already read this TSB this morning at the service department. Just some information to pass along to anyone who is or has or still is experiencing the same problem as I have. Again, the Ford Part Number is 7R3Z-9H307-C ask them to change it and it will solve the problem. Also another reminder for you, these new pump units are on back order because Ford had to redesign the pump unit. Hope this helps.
:nice:
2006 Mustang, V6, 4.0L, with Pony Package, Satin Silver, 5 speed manual
 

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glewis29

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May 4, 2006
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Thanks for posting this. The first time it happened was after driving for a while on the freeway. The second time was when it was stone cold (probably 45 degrees outside). I'm not sure if the TSB applies to me, but if I can't figure out what's causing it, I might just go that route. :)
 

scrming

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Aug 9, 2005
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The 05+'s have a Torque Management System... basically it is the root of your hesitation issue... the computer limits the torque the motor will make. This is very noticable in 1st gear from a dead stop. To "fix" this pick up an SCT X-Cal2. For the automatics I highly recommend Alternative Auto (www.alternativeauto.com) Lidio is pretty much regarded as the top guy when it comes to an automatic. BTW.. the X-Cal2 will make a night and day difference in your car! You won't believe it!
 

shooterm1

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Jul 18, 2005
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Milford, Pennsylvania USA
scrming said:
The 05+'s have a Torque Management System... basically it is the root of your hesitation issue... the comShelby Enterprisesputer limits the torque the motor will make. This is very noticable in 1st gear from a dead stop. To "fix" this pick up an SCT X-Cal2. For the automatics I highly recommend Alternative Auto (www.alternativeauto.com) Lidio is pretty much regarded as the top guy when it comes to an automatic. BTW.. the X-Cal2 will make a night and day difference in your car! You won't believe it!

Why hasn't "someone?" specifically addressed this particular problem???

Why do we have to puchase a complete street and strip tune system, when all we want is to get rid of the Torque Management System... ?

a quick down loadable patch is all that's necessary.

Frankly I'm dumbfounded that no one has hacked the code and distributed the fix (for a nominal fee of course).

"someone?" is missing out on a wonderful business opporTUNEity :flag:
 

CityguyUSA

New Member
Jun 29, 2018
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York, PA
I think I notice the hesitation on my 07 when slowing but not stopping like a merge situation and you go to give it the gas and you have that split second of hesitation. I remember at first I thought it had something to do with the shifting when I bought the car but I couldn't always figure out when it was going to happen. You mention the "right turn" and that's something that I have noted as well. Does that mean that it doesn't happen going left or that I'm just not paying attention? That would almost seem like a carburetor issue if we had one, where a little sloshing of the fuel is causing a slight interruption in fuel delivery.

Of course, the 07 also has a problem fueling the tank at certain times of the year. It seems to happen when it's warmer but not always so I guess it has more to do with the temperature of the fuel in the ground. The tank doesn't breath right. My mechanic told me there's a service bulletin out their regarding this but Ford isn't fixing it. So beware when you're trying to redeem your gas points that you don't underfill the car. The air can't always escape causing the pump to keep shutting off from the pressure coming from the gas tank over and over until you find some odd way of inserting the nozzle and squeezing the trigger just slow enough for that air to get out. That gas tank inability to equalize right might be causing a suction issue when the car's fuel pump is trying to get gas to the cylinders.
 

isaiahfig71

New Member
May 8, 2020
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clearwater
thank you my 04 gt is doing the same I thought it was a boat load of parts I changed all the sensors I even put more mods to see if it will pick up a little come to find out my dyno tuner said you got a low voltage happening in the fuel pump only fun part is sucks I need too drop the tank
 
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