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Bad hesitation on W.O.T acceleration

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Old 06-28-2008, 05:39 PM   #1
badger2840
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Default Bad hesitation on W.O.T acceleration

Heres my issue
Going down the highway been driving for about 2 hours then i go to pass a big semi
hit the gas hard , my auto 2006 gt downshift then bogs down like 3 times (almost like it upshifted downshifted and upshifted) this lasted no more than maybe 2 seconds then she took off like a bat out of hell.
happened 2 times on 2 different passing attemps , both time i was maybe doing 110 km/h when i mashed the gas and the car bogged down.
Anyone have any insight? Is this a known issue or something completely unheard of.
kinda felt like the car wasnt getting any gas
vrooommmm...beuhhhhhhhhhhhhhh...vrooooooom...beuhh hhhhhhhhhhh vroooooooooooooooooooooooooooooooooooooooooom gone then i took off.
Im puzzled.
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Old 06-28-2008, 05:53 PM   #2
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Default RE: Bad hesitation on W.O.T acceleration

im guessing fuel pump TSB is a good place to start
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Old 06-28-2008, 06:01 PM   #3
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Default RE: Bad hesitation on W.O.T acceleration

mine does the same exact thing but my fuel pump was all ready replaced. Ford dealer told me an induction system cleaning was needed
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Old 06-28-2008, 06:22 PM   #4
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Default RE: Bad hesitation on W.O.T acceleration

do you guys have traction control on while cruising on the highway? if i'm doing say like 65 and i have to quickly pass someone and drop it into third and whack the gas my traction control will cut the power right off. scared the heck out of me first time it happened. i turn off traction control now everytime i go on the highway for that very reason andi haven't had a problem since. give it a try.
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Old 06-28-2008, 07:00 PM   #5
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Default RE: Bad hesitation on W.O.T acceleration

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ORIGINAL: tungsten07

do you guys have traction control on while cruising on the highway? if i'm doing say like 65 and i have to quickly pass someone and drop it into third and whack the gas my traction control will cut the power right off. scared the heck out of me first time it happened. i turn off traction control now everytime i go on the highway for that very reason andi haven't had a problem since. give it a try.

Yes i did have my traction control on at both attempts to pass, il try taking it off when i hit the highway next time and floor it.
Thanks for the input guys.im still gonna check that fuel pump tsb howarmat stated.
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Old 06-28-2008, 07:30 PM   #6
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Default RE: Bad hesitation on W.O.T acceleration

My car does the same thing when I have been on the highway for a extended time. First time it scared the hell out of me. Have not had the chance to take it into the shop here. Will follow up on it once I get back to the states.

I will have to try the Traction Control system idea next time.
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Old 06-28-2008, 08:12 PM   #7
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Default RE: Bad hesitation on W.O.T acceleration

I do not think it has anything to do with TC. It is just a common problem with the automatic transmission and the drive by wire throttle.

It can be very scary, especially when you're trying to get around someone slow and the guy coming up behind you is flying!

If you are in D (and probably in 5th) and want to pass quickly, the car just doesn't know what gear to go into. Try turning overdrive off with the button on the side of the shifter and the car will more easily drop down a gear. Or just do not floor it all the way, but learn to just give it enough throttle to kick it down one or 2 gears.

I used to have that hesitation all the time, but not recently. I think I just changed my driving style. Or maybe I just hate flooring it and seeing all my money getting burned up!

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Old 06-28-2008, 08:22 PM   #8
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Default RE: Bad hesitation on W.O.T acceleration

Quote:
ORIGINAL: Orion_240

I do not think it has anything to do with TC. It is just a common problem with the automatic transmission and the drive by wire throttle....

It's not just auto's that have that problem so it's either fuel deliver, ignition or the TCS (since the TCS WILL prevent overpowering the rear wheels). I'm considering disconnecting the battery AND reloading my tune. But since it's so darned intermittent, it's really a b**ch to diagnose.
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Old 06-29-2008, 08:11 AM   #9
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Default RE: Bad hesitation on W.O.T acceleration

probably gonna get the ole dealer run-around " Im sorry sir but we cant seem to recreate the issue you are experiencing, your car is fine thank you and have a nice day"
Im gonna take her in next week and see what they say about it.
Il try to keep people up to date on this , it can be a safety issue if you want my opinion because when i changed lanes to go to the passing lane and my car bogs down on me it literally scared the living **** out of me because im expecting to go zoom not boom and now im hesitant on passing when i see someone coming up in my rear view.
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Old 06-29-2008, 09:49 AM   #10
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Default RE: Bad hesitation on W.O.T acceleration

it's not an automatic thing trust me guys try taking the tcs off.
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Old 06-29-2008, 10:27 AM   #11
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Default RE: Bad hesitation on W.O.T acceleration

"The TCS only wears out your brakes" is what I was told by one mechanic. I start my car and turn it off as standard procedure.
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Old 06-29-2008, 11:43 AM   #12
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Default RE: Bad hesitation on W.O.T acceleration

People, what is happening is you have that instant spike in revs and your rev limiter is kicking in. It's not the throttleand it's not the TC.
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Old 06-29-2008, 12:54 PM   #13
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Default RE: Bad hesitation on W.O.T acceleration

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ORIGINAL: GidyupGo

People, what is happening is you have that instant spike in revs and your rev limiter is kicking in. It's not the throttleand it's not the TC.
Guess the reason I dont have the problem is A. Manual Trans, B. TCS Disabled in Tune, C. RPM Limiter at 7200 rpm.
At any rate my car doesnt doit.
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Old 06-29-2008, 01:43 PM   #14
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Default RE: Bad hesitation on W.O.T acceleration

my car did it and it was the fuel pump - the dealer changed it for me when i told him i almost got killed when passing; they cannot replicate this at the dealership; since then i have not had the problem; so get it changed - read the tsb and tell them that is what is happening; then if it does not happen again you have found the problem; if it does happen then that is one less item to worry about.
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Old 06-29-2008, 03:05 PM   #15
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Default RE: Bad hesitation on W.O.T acceleration

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ORIGINAL: GidyupGo

People, what is happening is you have that instant spike in revs and your rev limiter is kicking in. It's not the throttleand it's not the TC.
thats not true at all,it does it before the revs even get close to the limiter,its almost instant,soon as you hit the gas after cruising for a bit.

i have an 07, the TSB does not cover the 07 is what the dealer told me,lol,he wants to get a guy to ride around in my car and diagnose the problem,lol,yeah right. im calling monday to bitch at the service manager for wasting my time. he tried to also blame it on my tuner,just got the tuner a month ago,its been doing it since i bought the car,said he would still fix it for me and let me know how much it was going to cost me,lol.idiots!

i have a 5 speed
its happened to me about 5 times maybe in 6700 miles
happens when i get on it after cruising,not every time,just sometimes

from what ive been told,air pockets build up in the pump, then when you try and go,that pocket gets pushed through the pump and car falls on its face.

if i knew how the techs at the dealership fix it i would just do it my self.
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Old 06-29-2008, 03:32 PM   #16
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Default RE: Bad hesitation on W.O.T acceleration

with the TSB and the service manual you should be able to do it yourself i would think?
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Old 06-29-2008, 04:18 PM   #17
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Default RE: Bad hesitation on W.O.T acceleration

Quote:
ORIGINAL: one eyed *****

Quote:
ORIGINAL: GidyupGo

People, what is happening is you have that instant spike in revs and your rev limiter is kicking in. It's not the throttleand it's not the TC.
thats not true at all,it does it before the revs even get close to the limiter,its almost instant,soon as you hit the gas after cruising for a bit.

i have an 07, the TSB does not cover the 07 is what the dealer told me,lol,he wants to get a guy to ride around in my car and diagnose the problem,lol,yeah right. im calling monday to bitch at the service manager for wasting my time. he tried to also blame it on my tuner,just got the tuner a month ago,its been doing it since i bought the car,said he would still fix it for me and let me know how much it was going to cost me,lol.idiots!

i have a 5 speed
its happened to me about 5 times maybe in 6700 miles
happens when i get on it after cruising,not every time,just sometimes

from what ive been told,air pockets build up in the pump, then when you try and go,that pocket gets pushed through the pump and car falls on its face.

if i knew how the techs at the dealership fix it i would just do it my self.





The OP said it did it at WOT when the tranny downshifted. That is the time when the rpm's spike and it does indeed bounce off the rev limiter.
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Old 06-29-2008, 04:38 PM   #18
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Default RE: Bad hesitation on W.O.T acceleration

Readmy following post:

http://www.mustangforums.com/m_5180925/tm.htm

Might be the problem!?!
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Old 06-29-2008, 06:30 PM   #19
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Default RE: Bad hesitation on W.O.T acceleration

I don't have exactly the same symptoms, but its similar. When I go to pass, I'll bury the gas pedal, the car does nothing for a second or maybe two, THEN it goes WOT. There is such a delay, its annoying. The car has done it stock, when I had the FRPP Pro Cal tune, and now with my SCT tune. I told my tuner, he said, "thats funny, I've heard where its something with the transmisson, where its ready to go, but the engine isn't"...ok... Yeah... To me, its a delay where the TB doesn't recognize the WOT signal right away. Reminds me of the "pedal pressure" setting on EFI Live programming for GM LS equipped cars. I was wondering if this could be "tuned out" with the SCT? My tuner said he's "looking into it". Hmmmm....
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Old 06-29-2008, 08:04 PM   #20
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Default RE: Bad hesitation on W.O.T acceleration

Has nothing to do with traction control because it has happened to me with and without it on...It also has nothing to do with bouncing off the REV limiter as one had suggested...To the OP, I posted a response in a similar thread a few days ago...This same thing is happening to me and it only happens after an extended cruise at highway speeds...I also have an 06 5-speed, not the AUTO...Here is the post http://www.mustangforums.com/m_52105...tm.htm#5212054
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Old 06-29-2008, 08:04 PM
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