jerky between 40-45mph

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Feb 8, 2005 | 10:45 AM

#31

powerstrokin95

Freshman User

Joined: Nov 2003

Posts: 46

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From: Northern VA

what is the IVS and how do you adjust it?

Nov 14, 2008 | 07:11 PM

#32

rjmjr78

Freshman User

Joined: Jul 2008

Posts: 37

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From: Muldrow,OK

did anyone find out what the fix is for this problem?
I have an early 99 that does it bad.

Nov 14, 2008 | 10:14 PM

#33

empiretc

Lead Driver

Joined: Dec 2003

Posts: 5,250

Likes: 42

yes sir, push the throttle down some more..... j/k

its a tranny issue

Nov 17, 2008 | 07:52 PM

#34

rjmjr78

Freshman User

Joined: Jul 2008

Posts: 37

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From: Muldrow,OK

what part of south texas? I'm between houston and galveston. I had the tans. rebuild a few mths. ago but the problem is still there. want to get it fixed but don't know where to start.

Nov 17, 2008 | 08:09 PM

#35

empiretc

Lead Driver

Joined: Dec 2003

Posts: 5,250

Likes: 42

i'm in the RGV.

i corrected mine by adding the sonnax kit and sending the pcm to Jody.

if i had known better, I would have gotten the valve body from BTS when I had the tranny rebuilt.

Nov 17, 2008 | 08:09 PM

#36

cangim

Postmaster

Joined: Nov 2003

Posts: 3,595

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From: Utah County, UT

More than likely it is in the pedal. If you know someone else around you that has the same pedal assembly you could swap it out and verify. Most programming changes the TPS settings so 1% throttle equates to say 10%, gives a false sense of power so to say. If the pedal positioning is bouncing back between 0 and 10 everytime the pedal moves ever so slightly, I could see where the bouncing would come from.

Nov 17, 2008 | 08:41 PM

#37

BigJake34452

Senior User

Joined: Nov 2007

Posts: 305

Likes: 0

From: Inverness Fl

my 00 f250 with a 6 spd does the same thing, i had started a thread about it but nothing yet, hopefully we find a cause.

Nov 17, 2008 | 09:13 PM

#38

a-rod

Posting Guru

Joined: Feb 2006

Posts: 1,459

Likes: 0

From: Wyoming

I also notice this "surging" or light bucking at around 40mph, its only noticable to me when the motor isnt fully warmed up. I figured it was the injectors or something relate to that...

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Nov 17, 2008 | 09:22 PM

#39

rjmjr78

Freshman User

Joined: Jul 2008

Posts: 37

Likes: 0

From: Muldrow,OK

must not be a tranny thing if a 6spd. is doing it. Mine runs fine up till it goes into overdrive, if you let off and slow done to between 40 and 50 it surges like it doesnt want to downshift unless i give it about 1/2 pedal.