Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > >
Forgot Password? Join Us!

Welcome to Ford Ranger Forum

Reply
 
Thread Tools Search this Thread

  #1  
Old 02-12-2010, 12:55 PM
FireRanger FireRanger is offline
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default Speedometer is 3mph fast, odo is off too.

My speedometer has always been 3mph faster than actual. The odometer is off as well since it is driven by that.

A GPS and the scangauge both show the correct speed. If I go a GPS indicated 65mph, the scangauge will read 65 and speedometer will read 68. This works for any speed. The scangauge odometer will also tick up slower than the one on the dash since the one on the dash is going too fast.

I don't understand how the computer knows the correct speed (since it indicates correctly on the scangauge) but the speedometer and odometer are wrong. Any suggestions?
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #2  
Old 02-12-2010, 12:58 PM
Redneckstone Redneckstone is offline
Welcome to FRF, & enjoy!

 
Join Date: Oct 2009
Posts: 5,110
Default

Gnomes
__________________
2000 Ford Ranger XLT 4x4 Offroad, 4.0L ext cab, Converted to Manual M5OD-R1HD.
_____________
33x13.50 Toyo M/T, 15x10, Body Lift, Rebuilt OHV, JBA headers, Hurst shifter, Warn VR10000-s, Class 1 bars, Belltech Shackles, Mustang GT rear disc, Level II hooks, Modded rear hitch, Custom front hitch, Level II Blue seats and black console, Explorer IRS rear cover, Extang fulltilt, Leer Cap Yakima Roof Rack, Cobra 29 with firestik stake mount, Scangauge II
Few mods
Reply With Quote
  #3  
Old 02-12-2010, 01:05 PM
Tom Tom is offline
Ranger Enthusiast
 
Join Date: Nov 2008
Posts: 6,829
Default

I've noticed the same thing on mine when comparing GPS speed vs the speedometer but that's weird that the scanguage shows the accurate speed.

It wouldn't surprise me if this was some kind of anti-liability thing. Where they intentionally show a slightly faster speed so they can't be blamed for things like speeding tickets.
__________________
2006 Ford Ranger Sport 4.0 2WD on 32x11.50R15s
-3" Doetsch Spindle Lift


Using the forum:
How to Post on the Forum
Creating a signature (do this before asking any questions)
Upload an Avatar (image of your Ranger)
How to Post Pictures on the Forum
Switch the site layout: Light Theme or Dark Theme

Things to do:
Participate in Truck of the Month
Participate in the Ranger Photo Contest
Participate in the Non-Automotive Photo Contest
Become a Site Contributor
Shop at the FordRangerForum.com Store
Reply With Quote
  #4  
Old 02-12-2010, 01:12 PM
dixie_boysles dixie_boysles is offline
5.Oh All the way

 
Join Date: May 2009
Posts: 6,581
Send a message via Yahoo to dixie_boysles
Default

mines off by 2-3 mph according to GPS.
__________________
2014 F150 SuperCrew XLT 4x4
275/65/17 Falken Wildpeak AT3W | Shorty Antenna | Tinted Windows | ProClip Phone Mount |5.0 v8 |Tow Package | Oxford White


Sold/Totaled: 2006 Ranger XLT 2D SuperCap 4x4 Torch Red
15x8 Pacer 164P Polished Wheels | 31x10.50 BFG ATs | Level II Tow Hooks | FX4 Red Insert Seats
Tinted Windows | 6000K HIDs | Kobalt Low Profile Toolbox | Pioneer Speakers
Reply With Quote
  #5  
Old 02-12-2010, 01:13 PM
FireRanger FireRanger is offline
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default

Neither would I. But it also throws off the actual mileage of the truck. My truck with 107,000 actually only has about 100,000. Thats 7,000 less miles.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #6  
Old 02-12-2010, 01:14 PM
stephen stephen is offline
Ford Ranger Driver
 
Join Date: Oct 2009
Posts: 3,274
Default

mines off by 2 or 3 when i drive by those signs on the side of the road that tell you how fast your going. i always thought it was the tires size but tom might have a point there with the liability.
__________________
2008 Sport Black 3.0 V6 2WD.
Build Thread

Reply With Quote
  #7  
Old 02-12-2010, 01:21 PM
RangerJustin RangerJustin is offline
~+!)@(#*$&%^
 
Join Date: May 2009
Posts: 3,033
Send a message via AIM to RangerJustin Send a message via Skype™ to RangerJustin
Default

Quote:
As of 1997, Federal standards in the United States allowed a maximum 5% error on speedometer readings.
Pulled from wikipedia...
__________________
Sold:2004 XLT 4x2 Ext. Cab. 3.0 Mods: 3" spindle, AAL, shackle, 32x11.5 on 15x8s, billet grille, clear corners, flow 40 dumped, line-x, CB/PA, traction bars, lil sound system, auto up down windows
Sold:2005 XLT 4x4 Ext. Cab. 4.0 Mods: ProComp lights w/ HID swap on tabs, 32x11.5 on 15x8s, CB/PA, black out heads/corners, lil sound system, cranked t-bars, flow 40 dumped, line-x, shell, bed rug, 06+ tails, metal tail gate handle since plastic one shattered, OHC, Mustang Dome.
Reply With Quote
  #8  
Old 02-12-2010, 01:46 PM
Jp7 Jp7 is offline
DISABLE ADBLOCK: LOLZ
 
Join Date: Dec 2009
Posts: 1,438
Default

Quote:
Originally Posted by RangerJustin View Post
Pulled from wikipedia...
So if you are going 3mph and it is 3mph off that makes it 100% off!

Both of my Rangers are 3mph off.
__________________
Looking for a professional retrofitter to add HIDs or LEDs to your Ranger? PM me if your looking to have work done, and have cash to spend.

Quote:
Originally Posted by FireRanger View Post
I'm dying to see this at night. Someone go tell the sun to give up already.
Quote:
Originally Posted by beef08 View Post
Your the man, you bring our dreams to a reality within the lighting spectrum
Quote:
Originally Posted by BCobe View Post
Jp7 you always do AMAZING work! Hats off to you sir
Quote:
Originally Posted by FireRanger View Post
People so often confuse "hating" with "knowing better".
Reply With Quote
  #9  
Old 02-12-2010, 05:20 PM
surfer03133 surfer03133 is offline
Dead Whales Everywhere!
 
Join Date: May 2009
Posts: 929
Send a message via Skype™ to surfer03133
Default

my truck is weird because scan gauge and GPS will say i am going 45 mph, speedo will say like 48, then i go past a radar and it says i am going 48, but my GPS which shouldnt be wrong, especially on cruise control, says im going 3 mph slower?!?!?
__________________
08 Ranger Sport 2wd
aFe CAI, 30x9.5.x15 Grabber AT2s, U/D pulleys, flowmaster super 44

"Those who make peaceful revolution impossible will make violent revolution inevitable."
- John F. Kennedy

"Somehow the "god of the athiests" delivers more miracles than all other religion combined than..."
Reply With Quote
  #10  
Old 02-12-2010, 05:56 PM
ranger101 ranger101 is offline
Ford Ranger Driver
 
Join Date: Dec 2009
Posts: 2,571
Default

Mine is 5mph off. Mine is probably because of my tires though. I've been thinking of popping off the needle for the speedometer and going down the road at about 50 using my GPS and popping it back on there. Anybody know if that would work?
__________________
2002 XLT 4X4
Auto 4.0L SOHC
8.8 w/ 4.10 L/S

Mods: Xcal 2, K&N Drop-In, Line-X, DSG Heads/Corners, 6000k Hi/Low HID's, 6K HID Fogs, Foglight Mod, Throttle Cable Mod, 6.5" Digital Designs, Rockford P400.4, 2 Sundown SA-15's, MB Quart DSC 2000.1d, Cranked T-Bars, 285/75/R16 Nitto Terra Grapplers
Reply With Quote
  #11  
Old 02-12-2010, 06:01 PM
ObsoleteE ObsoleteE is offline
I'm an F-18, bro
 
Join Date: Jan 2010
Posts: 1,972
Send a message via AIM to ObsoleteE
Default

Quote:
Originally Posted by ranger101 View Post
Mine is 5mph off. Mine is probably because of my tires though. I've been thinking of popping off the needle for the speedometer and going down the road at about 50 using my GPS and popping it back on there. Anybody know if that would work?
I'm going to have to say no. You can recalibrate the speedo for different tires with a programmer though.
__________________
1999 B2500 5 Speed
Reply With Quote
  #12  
Old 02-12-2010, 06:15 PM
FireRanger FireRanger is offline
Blinded by the light
 
Join Date: Sep 2009
Posts: 7,674
Send a message via AIM to FireRanger
Default

Well the thing is I have stock tires. I shouldn't have to buy a programmer to make it read correctly when it is all stock. Stupid POS.
__________________
(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
Reply With Quote
  #13  
Old 02-12-2010, 06:28 PM
ObsoleteE ObsoleteE is offline
I'm an F-18, bro
 
Join Date: Jan 2010
Posts: 1,972
Send a message via AIM to ObsoleteE
Default

Quote:
Originally Posted by FireRanger View Post
Well the thing is I have stock tires. I shouldn't have to buy a programmer to make it read correctly when it is all stock. Stupid POS.
Mine is also off by a couple mph, my car is too, but my tires on the car are about 1/2 inch smaller than stock.
__________________
1999 B2500 5 Speed
Reply With Quote
  #14  
Old 02-12-2010, 07:03 PM
ranger101 ranger101 is offline
Ford Ranger Driver
 
Join Date: Dec 2009
Posts: 2,571
Default

Quote:
Originally Posted by ObsoleteE View Post
I'm going to have to say no. You can recalibrate the speedo for different tires with a programmer though.
I have that. And it still puts it a couple mph off. I guess that's as close as it's going to get though.
__________________
2002 XLT 4X4
Auto 4.0L SOHC
8.8 w/ 4.10 L/S

Mods: Xcal 2, K&N Drop-In, Line-X, DSG Heads/Corners, 6000k Hi/Low HID's, 6K HID Fogs, Foglight Mod, Throttle Cable Mod, 6.5" Digital Designs, Rockford P400.4, 2 Sundown SA-15's, MB Quart DSC 2000.1d, Cranked T-Bars, 285/75/R16 Nitto Terra Grapplers
Reply With Quote
  #15  
Old 03-08-2010, 12:37 AM
Built Ford Tough Built Ford Tough is offline
Ford Motor Company
 
Join Date: Mar 2010
Posts: 126
Default Re: Speedometer is 3mph fast, odo is off too.

THANK GOD! I thought I was the only one that had this problem ahahaaha!
__________________
Danger Ranger: 389k Miles, and Being primed for a 5.0
1998 Ranger Splash, 134k Miles 2.5l 4banger - SOLD
Next Ranger Build: Supercharged Propane Injected 4bt 6 speed 4x4 ranger SAS
Current Rig: 91 d250 Single Cab Flatbed 6bt 5 Speed 4x4 Soon to have 100 horse ddp injectors and stage 2 fuel pin with 36" Miter cut 7" diameter sidepipe
Next Toy: 1994 f250 with built 429 fresh zf5 4x4 full exhaust and intake (carb)
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Code P0153 Bank 2 sensor 1 slow response. 2000ranger 3.0 Vulcan Tech 4 01-06-2012 01:06 PM
clanking sound at slow speeds on bumpy roads. dribron General Ford Ranger Discussion 5 12-25-2011 08:15 AM
RPS was slow... Bwad Introduce Yourself 27 01-10-2010 10:43 PM
speedometer HELP camoman Electrical Tech 3 11-25-2009 05:58 AM
ABS AND Speedometer Jackal General Tech 1 06-24-2009 07:54 AM