Jumping speedometer fix - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 07-12-2007
wvcat's Avatar
Member
Thread Starter
iTrader: (4)
 
Join Date: May 2007
Location: New Cumberland
Posts: 2,044
Jumping speedometer fix

I thought I'd share my experience with you all, maybe it could help someone.
When I bought my 99 2wd ranger the first thing I nioticed was the speedometer acting very strange. Seemed to work ok to abot 30mph then it would go to 0 and jump back up. after driving it some I realized when you gave it gas it would stop working then when you let up it would jump back up. I stopped at the parts store and picked up a speed sensor and when I crawled under to change it I was suprized to find out that the trans wasn't even drilled for a speedo gear, just a casting boss that hadn't ever been opened up from the factory. Of course I figured maybe the speedo was bad so I change the cluster from my parts truck....same thing. Of course me always doing stuff the hard way I finally pulled out the repair manual and read it. It seems that the speed sesor on my truck is combined with the abs sensor in the rear axle. So this evening I pulled out the abs sensor and cleaned it with carb cleaner and reinstalled it. The speedo works normal now.
John
Reply With Quote
  #2  
Old 07-12-2007
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,833
Good fix.

Ford had the rear axle ABS sensor doing double duty as the speed sensor from 98~2000. Speedometer problems and erratic shifting (automatics) are common problems on these years when the ABS sensor starts to get flaky. Sometimes it will also display a CEL for code P0500 but not always.
Reply With Quote
  #3  
Old 07-12-2007
wvcat's Avatar
Member
Thread Starter
iTrader: (4)
 
Join Date: May 2007
Location: New Cumberland
Posts: 2,044
Good info thanks, Mine didn't produce a code.
John
Reply With Quote
  #4  
Old 07-13-2007
ranger_banger's Avatar
Member
 
Join Date: Nov 2006
Location: cedar falls, iowa
Posts: 405
Quote:
Originally Posted by rwenzing
Good fix.

Ford had the rear axle ABS sensor doing double duty as the speed sensor from 98~2000. Speedometer problems and erratic shifting (automatics) are common problems on these years when the ABS sensor starts to get flaky. Sometimes it will also display a CEL for code P0500 but not always.
jokes on them...my truck doesn't even have ABS!!! haha. thank god...abs scares the hell out of me...i'll keep this fix in mind for the future...
Reply With Quote
  #5  
Old 07-13-2007
Blhde's Avatar
Member
 
Join Date: Oct 2005
Location: Northern IL
Posts: 2,804
Quote:
Originally Posted by ranger_banger
jokes on them...my truck doesn't even have ABS!!! haha. thank god...abs scares the hell out of me...i'll keep this fix in mind for the future...

Your 94 has a cable driven speedo.
Reply With Quote
  #6  
Old 07-22-2007
Member
 
Join Date: Jul 2007
Location: Kennard
Posts: 4
I have ran into the same problem this week. Tried the gauge first and no help. Bought a speed sensor and cant find it on tranny. Bought the book and learned about the double duty sensor on the rear axle. Found a sensor that looked something like the one I had purchased, but when I took it out it looks completly different. It looks like a simple short probe. Is this the correct sensor or am I completly missing it? Thanks for any advice...
Reply With Quote
  #7  
Old 07-22-2007
Blhde's Avatar
Member
 
Join Date: Oct 2005
Location: Northern IL
Posts: 2,804
First of all what year. What sensor did you buy?
Reply With Quote
  #8  
Old 07-22-2007
wvcat's Avatar
Member
Thread Starter
iTrader: (4)
 
Join Date: May 2007
Location: New Cumberland
Posts: 2,044
The sensor is located on the top of the differential. I took mine out and cleaned with carb cleaner and the problem went away. Took the one I bought back and cashed it in for the 20 bucks I paid...lol
John
Reply With Quote
  #9  
Old 07-23-2007
Member
 
Join Date: Jul 2007
Location: Kennard
Posts: 4
Yea, the abs sensor on top of the differential... It didnt fix my problem tho... Im guessing my problem is deeper? Like maybe inside the differential? I might have lost the part on ring gear that flags the sensor?
Signed,
Out of luck
Reply With Quote
  #10  
Old 07-24-2007
Blhde's Avatar
Member
 
Join Date: Oct 2005
Location: Northern IL
Posts: 2,804
Make sure the needle doesn't bind.

You also my have loose connection.

Possibly a loose tone ring in the rear end, but i doubt it.

Last edited by Blhde; 07-24-2007 at 04:28 PM.
Reply With Quote
  #11  
Old 07-24-2007
Member
 
Join Date: Jul 2007
Location: Kennard
Posts: 4
No loose connections that I can see... I think I will try pulling the sensor again and maybe have someone sit in the truck with ignition on and watch the speedo as I flag the sensor to and fro... Im guessing I could isolate the problem to either wiring to the front or in the differential, depending on if we have any speedo movement or not...
Reply With Quote
  #12  
Old 07-24-2007
Blhde's Avatar
Member
 
Join Date: Oct 2005
Location: Northern IL
Posts: 2,804
Keep in mind the 99 has an electronic speedo. So there maybe a mechanical portion of the cluster which is bad.


I have personally had problems with the wiring harness for the back half of the truck(mine was fuel related but the run together). In my case the cab seemed to settle on the the harness rubbing it till shorted out under the truck.

To check for this will need to get under the truck right under the drivers seat. Look for any rubbing of harnesses that come threw the body. Especially where the connectors are on the black plastic shelf. This may not be your problem buts it free to look at.
Reply With Quote
  #13  
Old 07-24-2007
Member
 
Join Date: Jul 2007
Location: Kennard
Posts: 4
Alright, I like that free part... I will do some checking, as soon as I get a night off.
I will get back with ya'
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
VSS Speedometer fix for 2001~2003 Ranger V8 swap V8 Level II 8-Cylinder Tech 18 01-22-2017 07:29 AM
speedometer jumping jjntj2003 General Ford Ranger Discussion 3 01-29-2016 11:44 AM
1995 Ranger Jumping Speedometer fossl General Technical & Electrical 0 12-30-2014 05:50 PM
Windows are Jumping.. Strider0O0 Interior Semi-Tech 8 03-31-2006 11:04 PM
steering is jumping around a bit. what is it wdstone Suspension Tech 5 06-11-2005 06:59 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 09:52 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.