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  #1  
Old 12-27-2010, 09:41 AM
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Default Highway speed jerking/bucking

Hey guys, Ive searched the forums and been able to find very little to help me with my issue save the possibility of bad plug wires...(Witch may be it or a seperate issue because of my recent terrible MPG.)
I have a 2005 Fx4 Level II 4.0 L. It has about 55,000 on it.

Lately, I have been noticing a single jerk or buck every so often when cruising at about 55-60 mph.
Seems to be getting more frequent and it varies in intensity.
It SEEMS to only happen when load(gas) is applied/unapplied and when in overdrive. Otherwise the truck runs great.

Does not SEEM to be transmission slippage..seems more like a bind or something
No Tach surge at all..no lights. possibly a tiny Clunk.
Does it in 4 or 2 WD.
only thing changed is the recent addition of a K&N Filter. MAF?
Could this be an issue with the factory locker?(Notice it more when it is very cold outside)

Truck has always felt like it is dragging a sack of potatoes...figured it was nature of the beast.
Thank you in advance for any info.
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2005 Ranger Fx4 level II 4.0L. Flowmaster 40 series Cat back dual exaust,K&N drop in Air filter, brush bar, nerf bars,PIAA Fog lamps and T bar crank...otherwise, bone stock.

Last edited by Hornblas; 12-27-2010 at 09:42 AM. Reason: spelling..:(
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  #2  
Old 12-27-2010, 09:43 AM
slut life
 
Join Date: Oct 2010
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Default Re: Highway speed jerking/bucking

possibly sticking brakes?
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99 extended cab, 4.0, auto

k&n filter, airbox mod, screamin demon coil pack.

cranked t-bars, add a leaf springs out back, 3 inch body lift, 33 BFG KM2s on black steel wheels.

kenwood kdc-x794 ipod ready deck, 600 watt amp, rockford fosgate 10 inch P1 sub, dynomatting the cab as time permits about 25% done so far.

5k HIDs with clear lights, fog light mod.
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  #3  
Old 12-27-2010, 09:44 AM
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Default Re: Highway speed jerking/bucking

My 96 ranger does this buck every so often, usually when in 5th gear going up hill or under big load. Almost like its started to lug out.

You say it feels like your dragging a sack of potatoes, is it possible the ebrake is partially engaged? either at the wheel or with the foot pedal? and the light is not on?
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  #4  
Old 12-27-2010, 09:49 AM
slut life
 
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Default Re: Highway speed jerking/bucking

on my 90 that i had, the truck would do something similar now that i think about it, it turned out to be the rear end had chipped a ring tooth, and then the whole rear end went BOOM a few months later...
__________________
99 extended cab, 4.0, auto

k&n filter, airbox mod, screamin demon coil pack.

cranked t-bars, add a leaf springs out back, 3 inch body lift, 33 BFG KM2s on black steel wheels.

kenwood kdc-x794 ipod ready deck, 600 watt amp, rockford fosgate 10 inch P1 sub, dynomatting the cab as time permits about 25% done so far.

5k HIDs with clear lights, fog light mod.
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  #5  
Old 12-27-2010, 10:15 AM
Banned
 
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Posts: 14,058
Default Re: Highway speed jerking/bucking

I had a 93 XL that did that and it was plugs,wires and a bad coil pack. Check them but with only 55k on your truck that may not be it
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  #6  
Old 12-27-2010, 11:44 AM
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Default Re: Highway speed jerking/bucking

Well, no brake light..no lights at all.
I will have to pull the wheels and check for irregular brake wear.

If it does happen to be like a chipped pinion gear..I guess I find out when it goes boom..lol
for S &G's Im gonna do a tune up and see if that makes a difference...Ill post results soon. Thank you.
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2005 Ranger Fx4 level II 4.0L. Flowmaster 40 series Cat back dual exaust,K&N drop in Air filter, brush bar, nerf bars,PIAA Fog lamps and T bar crank...otherwise, bone stock.
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  #7  
Old 12-27-2010, 12:01 PM
former ranger owner
 
Join Date: Sep 2010
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Default Re: Highway speed jerking/bucking

does it happen to only do it when it snows?
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'94.5 f-250 7.3 powerstroke 4x4 5speed
Riffraff 6637 intake, TS 6 chip, MBRP turbo back exhaust, tinted.. more to come
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'14 scion tc monogram series 6spd
a few things here and there

'03 fX4 Level II-(SOLD)
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  #8  
Old 12-27-2010, 08:40 PM
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Default Re: Highway speed jerking/bucking

Quote:
Originally Posted by ranger024x4 View Post
does it happen to only do it when it snows?
I have only noticed it with snow yes...first time it did it, it had just begun to snow....there was a dusting on the road...today, there was melting snow...mostly wet pavement...and high winds...could that be a factor?
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2005 Ranger Fx4 level II 4.0L. Flowmaster 40 series Cat back dual exaust,K&N drop in Air filter, brush bar, nerf bars,PIAA Fog lamps and T bar crank...otherwise, bone stock.
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  #9  
Old 12-27-2010, 08:53 PM
Chrome Dont Get You Home
 
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Posts: 1,169
Default Re: Highway speed jerking/bucking

mabye its your locker engaging due to some slippery conditions?
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  #10  
Old 12-27-2010, 10:01 PM
www.shanewootenband.com
 
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Default Re: Highway speed jerking/bucking

have you serviced the trans? it about due..
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  #11  
Old 12-27-2010, 11:11 PM
former ranger owner
 
Join Date: Sep 2010
Posts: 3,366
Default Re: Highway speed jerking/bucking

Random misfires when it snows

check the link. you maybe having the same issue
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'94.5 f-250 7.3 powerstroke 4x4 5speed
Riffraff 6637 intake, TS 6 chip, MBRP turbo back exhaust, tinted.. more to come
Soon: 4inch lift and 35's

'14 scion tc monogram series 6spd
a few things here and there

'03 fX4 Level II-(SOLD)
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  #12  
Old 12-28-2010, 07:47 AM
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Default Re: Highway speed jerking/bucking

Quote:
Originally Posted by ranger024x4 View Post
Random misfires when it snows

check the link. you maybe having the same issue

Dude, thanks, that sounds very similar...I'll investigate
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2005 Ranger Fx4 level II 4.0L. Flowmaster 40 series Cat back dual exaust,K&N drop in Air filter, brush bar, nerf bars,PIAA Fog lamps and T bar crank...otherwise, bone stock.
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  #13  
Old 02-13-2012, 09:16 AM
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Join Date: Feb 2012
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Default Re: Highway speed jerking/bucking

Hi all my 2002 ford ranger is also doing this , one thing i noticed is it only does it when it snows even very slight. i thought it was bad gas so i used heat gas treatment and it would seem to go away . then it would come right back next time it snowed. i checked to make sure nothing was unhooked I.E like the hose from the air filter and such nothing was unhooked. it has about 159000 on it but other then that runs great. Im glad to see that im not the only one having this issue so maybe i can get it resolved . any help would be much appreciated!

----------

Quote:
Originally Posted by joshuat143 View Post
Hi all my 2002 ford ranger is also doing this , one thing i noticed is it only does it when it snows even very slight. i thought it was bad gas so i used heat gas treatment and it would seem to go away . then it would come right back next time it snowed. i checked to make sure nothing was unhooked I.E like the hose from the air filter and such nothing was unhooked. it has about 159000 on it but other then that runs great. Im glad to see that im not the only one having this issue so maybe i can get it resolved . any help would be much appreciated!
also there is no snow build up on the ground at all just flying in the air .
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  #14  
Old 02-14-2012, 07:19 AM
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Default

Quote:
Originally Posted by joshuat143
Hi all my 2002 ford ranger is also doing this , one thing i noticed is it only does it when it snows even very slight. i thought it was bad gas so i used heat gas treatment and it would seem to go away . then it would come right back next time it snowed. i checked to make sure nothing was unhooked I.E like the hose from the air filter and such nothing was unhooked. it has about 159000 on it but other then that runs great. Im glad to see that im not the only one having this issue so maybe i can get it resolved . any help would be much appreciated!

----------

also there is no snow build up on the ground at all just flying in the air .
I have since figured out that it was indeed the k and n filter and snowflakes..replaced with a paper filter for winter and problem resolved. Thanks guys!!
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2005 Ranger Fx4 level II 4.0L. Flowmaster 40 series Cat back dual exaust,K&N drop in Air filter, brush bar, nerf bars,PIAA Fog lamps and T bar crank...otherwise, bone stock.
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  #15  
Old 02-14-2012, 04:52 PM
2000 v6 4.0 4x4
 
Join Date: Aug 2011
Posts: 10
Default Re: Highway speed jerking/bucking

If it starts again check your fuel pressure. If you have low pressure the truck will feel slow and misfire.
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