Speedo Problem!!

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Sep 27, 2009 | 08:56 AM

jamestown55

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Joined: Sep 2009

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Speedo Problem!!

I am having a problem with my speedometer, it only works when I reach 80km/h and above? Any help would be greatly appreciated. It is a 99 F250 Diesel 7.3

Sep 27, 2009 | 10:02 AM

bfife

still plays with trucks

Joined: Mar 2004

Posts: 1,743

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From: Twin Falls Idaho

First of all Welcome to FTE. glad to have you here.

It might be the VSS speed sensor, If I remember correctly its mounted in the top of the rear differential. pull it out and check to see if it has alot of stuff stuck to the magnets.
But where it work only after you reach a given speed it makes me think you might need an speedo cluster.
Barney

Sep 27, 2009 | 10:52 AM

Ponyboychris

Lead Driver

Joined: Jan 2007

Posts: 6,708

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From: Kiowa CO

I also think it's your Vehicle Speed Sensor (VSS) on the top of the rear diff. A common problem and the fact that your speedo only works after reaching a certain speed is the telltale sign that it's bad. Also, if you have an auto tranny, the O/D light will also blink. It's only about $25 from Ford for a replacement. It's a 10 minute job to swap/inspect and you don't need to jack it up to get to the sensor.

On edit: Welcome to FTE.

Sep 27, 2009 | 10:53 AM

robs01f250

Elder User

Joined: Oct 2007

Posts: 935

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From: Bowling Green, KY

take the vss off and clean it real good, then reinstall it and see if it works correctly

Sep 27, 2009 | 01:28 PM

Layson

Posting Guru

Joined: Jan 2007

Posts: 2,174

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From: Millersburg, OR

Also might want to check your front ABS sensors. The PCM uses all three sensors, if one is off it won't work properly. If someone has AE nearby they would beable to tell what is wrong.

Oct 8, 2009 | 02:27 PM

jamestown55

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Thanks for the advice boys!!!!!! It was infact the VSS...Replaced it and now speedo works perfect....

Thanks Again

Oct 8, 2009 | 02:40 PM

Kwikkordead

Fleet Owner

Joined: Jun 2004

Posts: 25,090

Likes: 1,112

From: Rio Rico, AZ.

That was easy.

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Oct 8, 2009 | 03:06 PM

jcrammell

Senior User

Joined: Aug 2009

Posts: 459

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From: Show Low, AZ

Thats why you have got to love this place. Where else can you get such great help, so fast, and accurate. Hince the reason I became a supporter. I have only been here for a month and FTE has already saved me a bunch of $. Of course you have helped to spend it to and will continue to help spend it. lol