2001 4.0 and 5r55e: Bucking at highway speeds - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 03-04-2014
Member
Thread Starter
 
Join Date: Aug 2011
Location: Spokane WA
Posts: 4
2001 4.0 and 5r55e: Bucking at highway speeds

2001 4.0 with 5-speed auto, which research shows is a 5r55e.

60k on the odometer, picked it up a bit over a year ago and have noticed a bucking problem at highway speeds, normally 40MPH+.

It happens both in 2wd and 4wd and 3rd or 5th gear. I tried disabling OD when it was happening and it didn't go away, that's how I know it's not just in 5th gear.

It doesn't always happen, I can go months without an incident but it seems to have picked up the last few times my wife and I were out. I'm pretty sure it's transmission related, but hell, another problem could be manifesting itself.
Reply With Quote
  #2  
Old 03-04-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,579
Do you have a tachometer?
Does the RPM change during bucking, this would indicate engine issue vs trans

Fuel filters are $10 and if getting dirty can cause this, causes pressure drop at the rail when fuel pump is off.

MAF sensor can also cause this but usually at lower speeds, but easy to clean, don't use carb cleaner.
Reply With Quote
  #3  
Old 03-04-2014
Member
Thread Starter
 
Join Date: Aug 2011
Location: Spokane WA
Posts: 4
It has a tach, but I haven't paid attention to it during the bucking. I'll do that next time.

It's do for an oil change, probably a good idea to get the fuel filter replaced anyway.
Reply With Quote
  #4  
Old 03-05-2014
Member
Thread Starter
 
Join Date: Aug 2011
Location: Spokane WA
Posts: 4
It happened again today, but only slightly. Traveling about 45 MPH and slight little bucking/jerking.

The tach was rock solid.
Reply With Quote
  #5  
Old 03-05-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,579
So you were correct, most likely a transmission issue.

There was a Ford TSB for 2000/2001 Rangers about the connector under the drivers seat.
This connector passes several system wires from inside the cab to outside the cab.
There was a problem with this connector getting water inside.
01-5-2
On this list
https://www.ranger-forums.com/genera...d-ranger-6485/

This could cause transmission issues, speedo issues, ABS issues, ect.....
Reply With Quote
  #6  
Old 03-05-2014
Member
Thread Starter
 
Join Date: Aug 2011
Location: Spokane WA
Posts: 4
Thanks, I just read through the list, the TSB listed a bunch of OBD codes that I'm not getting, but I'll check the connector out.

I was really hoping it was a common issue and I'd have 10 people post and point out what it is, lol. I've ran in a lot of Mustang circles and some vehicles just have their common problems. This apparently isn't one of them, shame too because it doesn't happen often enough to get a mechanic to see what the problem is.
Reply With Quote
  #7  
Old 03-05-2014
pearlkid9988's Avatar
Member
 
Join Date: Dec 2008
Location: Newnan Georgia
Posts: 828
could be a transfer case issue to the motor to move it in and out of 4wd has been none to fail and it may not be fully going into/out of 4wd so every so often the gears can catch making it buck could be totally off on that one but its worth checking.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
temperature gauge dropping slightly at highway speeds bgjeff23b DOHC - 2.3L Duratec / Mazda L Engines 6 05-06-2012 06:28 PM
Prolong Highway speeds RANGERX2 2.9L & 3.0L V6 Tech 1 01-30-2012 05:36 AM
Shimmy @ Highway Speeds JWall General Ford Ranger Discussion 35 04-17-2009 03:20 AM
High pitch noise at highway speeds PharmRanger4x4 4.0L OHV & SOHC V6 Tech 3 01-30-2008 10:53 AM
SLight bucking regular speeds IamLegend 2.9L & 3.0L V6 Tech 5 01-02-2008 06:42 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 06:04 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.