Slow speed "lunge"? - Ford Powerstroke Diesel Forum
6.7 Tranny Problems (2011-2016) 6.7 Tranny Problems

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post #1 of 22 Old 10-05-2015, 05:08 PM Thread Starter
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Slow speed "lunge"?

I recently did a EGR/DPF delete on my '13 F350. Now when I'm in a parking lot or anytime driving slowly (1-4 mph), the truck seems to "lunge" at around 5 mph. It's like a spike in power/speed. I've talked to the company who supplied the tune and it seems it's not the tune causing the issue. Truck never acted the way before the delete. Any ideas or suggestions?
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post #2 of 22 Old 10-17-2015, 09:45 PM
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Not sure if this helps you at all or not.

Running a 15 (also deleted). I can tell you that the acceleration is pretty sensitive at low speeds. There is no real sweet spot on the gas pedal for cruising 5-15 mph. I just feather it now.

I couldnt tell you how it was before the delete, wasnt original long enough.
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post #3 of 22 Old 10-17-2015, 09:49 PM
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When you tune you generally increase the throttle response. This can cause any little movement like small bumps or you moving to cause a noticeable surge. As long as the trans isn't slipping or slamming you don't need to worry.

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post #4 of 22 Old 10-19-2015, 06:43 AM Thread Starter
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Quote:
Originally Posted by ropegun2k View Post
Not sure if this helps you at all or not.

Running a 15 (also deleted). I can tell you that the acceleration is pretty sensitive at low speeds. There is no real sweet spot on the gas pedal for cruising 5-15 mph. I just feather it now.

I couldnt tell you how it was before the delete, wasnt original long enough.
Mine only does the lunging under 5 mph. and it's not like a constant surge or anything. Just single lunge.

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Originally Posted by CrazyS0b View Post
When you tune you generally increase the throttle response. This can cause any little movement like small bumps or you moving to cause a noticeable surge. As long as the trans isn't slipping or slamming you don't need to worry.
I'm not concerned about damage being cause, I don't feel like it's hard on the tranny. I've heard of guys complaining of the same problem that are not deleted/tuned. I've just never heard what they have done to fix the problem.
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post #5 of 22 Old 10-30-2015, 01:44 AM
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Is it up-shifting?
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post #6 of 22 Old 10-30-2015, 10:59 AM Thread Starter
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No its not up-shifting, stays in 1st. It does it under all these conditions under 5mph:

Forward/Reverse 2wd & 4wd
Forward/Reverse 4wd Lo
Traction control off
Manual selected 1st gear
On a incline or decline
Tow/Haul On & Off

I believe it has to be something in the throttle or something that the throttle uses for feedback. I acts the same under all the conditions above and I've been towing 12-15k in the mountains the past month without tranny issues.
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post #7 of 22 Old 10-30-2015, 11:01 AM Thread Starter
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I even had a tune wrote with no power increases or changes to the tranny, only disabling the emissions. No change in the lunge.
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post #8 of 22 Old 11-04-2015, 07:05 PM
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Mine has a similar trait to what you are describing. I went from the H&S engine/stock trans tune to a GH engine and trans tune. Much better low speed drivability and shifting. I would suggest looking into a different tune.
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post #9 of 22 Old 11-05-2015, 11:58 AM
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Quote:
Originally Posted by Sterling6.7 View Post
Mine has a similar trait to what you are describing. I went from the H&S engine/stock trans tune to a GH engine and trans tune. Much better low speed drivability and shifting. I would suggest looking into a different tune.
SAME!! with the canned H&S tunes I had the same surge in low speed/low gear. driving in parking lots was unbearable. Switch to the GearHeads tunes and fixed it.
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post #10 of 22 Old 11-19-2015, 03:59 PM Thread Starter
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SAME!! with the canned H&S tunes I had the same surge in low speed/low gear. driving in parking lots was unbearable. Switch to the GearHeads tunes and fixed it.
Just got a GH tune and it's still doing! Did you tell them anything in particular to correct the issue?
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