Speedo - F-Series & SuperDuty Diesel Forums

casper4203 · 11-20-2011, 09:58 AM

My '06 Lariat has the white faced speedo and tach. For several years, when it gets cold outside, I have problems with my seedometer. When not moving, it will show a speed of anything but 0. It varies where it hangs up. When I drive, it just adds to that setting.
For example: If it is hanging up at 30mph, when I reach 20mph, it's deading 50mph.
It's definately in the guage and its usually when it's cold. I've been debating taking the dash apart and checking it out. Can anybody talk me in or out of this.

DaveBen · 11-20-2011, 10:20 AM

I would change the Speed Sensor in the Rear End before I took the dash apart. It is on top of the rear end housing with a two wire connector and is not expensive. These usually give a zero speed reading when bad. Who knows

Dave

jpringle83 · 11-20-2011, 11:34 AM

Drain the rear diff fluid and take the sensor out and clean it really well. It stopped my gauge from bouncing around or going dead at times usually when the oil was cold.

BIG JOE · 11-20-2011, 12:06 PM

My vote would be for replaceing the Vehicle Speed Sensor first.... also.

casper4203 · 11-20-2011, 09:29 PM

Been messing with that already to get my ABS to shut off.
The needle hangs up off of zero with the truck on or off. It's just like its hanging up inside the guage.

BIG JOE · 11-20-2011, 09:51 PM

Don't remember when the PSDs went digital but if it's analog.. could be the speedo cable.. or the speedo head itself.

The speedo head went TU on my 91. Odometer still worked but the needle jumped all over stop all over the scale.. then it plain Quit working. replaced it for about 100 bucks, IIRC.

Joe

WD40 · 11-21-2011, 01:05 AM

My 06 was about a year old and I told the dealer it was doing this
and they replaced the head under the 36/36. It has worked fine for
the last 5 years.
Doug

11-20-2011, 09:58 AM	#1
casper4203 casper Join Date: Nov 2011 Location: Whiteford/MD/US Posts: 22 Thanks: 8 Thanked 0 Times in 0 Posts	Speedo My '06 Lariat has the white faced speedo and tach. For several years, when it gets cold outside, I have problems with my seedometer. When not moving, it will show a speed of anything but 0. It varies where it hangs up. When I drive, it just adds to that setting. For example: If it is hanging up at 30mph, when I reach 20mph, it's deading 50mph. It's definately in the guage and its usually when it's cold. I've been debating taking the dash apart and checking it out. Can anybody talk me in or out of this. __________________ 2005 F-250 Lariat EGR delete kit FX-4 w/ Fireatone air-bags Banks Air Ram all else is stock Original owner

11-20-2011, 10:20 AM	#2
DaveBen SDD Senior Member Join Date: May 2005 Location: Ukiah, California Posts: 7,875 Thanks: 127 Thanked 507 Times in 490 Posts	I would change the Speed Sensor in the Rear End before I took the dash apart. It is on top of the rear end housing with a two wire connector and is not expensive. These usually give a zero speed reading when bad. Who knows Dave __________________ 2004 F-350 Regular cab with 6.0, Torqshift, 4X4, and just about all of the rest of the options. I added Guages, Satellite Radio, Air Horns, and a coolant filter. Bilstein shocks. Battery Desulphater that really works. Installed Jimmi Jammers. Pictures here: http://community.webshots.com/user/dbennett48 Completely Stock. I had a Detroit Diesel 8V92TA in a KW dump truck in 1980. That sucker would put out 425 hp but would never out pull a CAT.

11-20-2011, 11:34 AM	#3
jpringle83 SDD Member Join Date: Feb 2007 Location: WA Posts: 151 Thanks: 2 Thanked 8 Times in 8 Posts	Drain the rear diff fluid and take the sensor out and clean it really well. It stopped my gauge from bouncing around or going dead at times usually when the oil was cold. __________________ 2005 F-250 Edge Insight gauges,Banks Monster Exhaust, AEM Brute Force intake , Toyo M/T 35s on AR 20s, air bags w/ wireless compressor,recon smoke cab and turn signal led lights

11-20-2011, 09:29 PM	#5
casper4203 casper Join Date: Nov 2011 Location: Whiteford/MD/US Posts: 22 Thanks: 8 Thanked 0 Times in 0 Posts	Been messing with that already to get my ABS to shut off. The needle hangs up off of zero with the truck on or off. It's just like its hanging up inside the guage. __________________ 2005 F-250 Lariat EGR delete kit FX-4 w/ Fireatone air-bags Banks Air Ram all else is stock Original owner

11-21-2011, 01:05 AM	#7
WD40 SDD Senior Member Join Date: Aug 2005 Location: Benton Arkansas & McAllen Posts: 2,759 Thanks: 57 Thanked 111 Times in 107 Posts View Photos By: WD40	My 06 was about a year old and I told the dealer it was doing this and they replaced the head under the 36/36. It has worked fine for the last 5 years. Doug __________________ 2006 Ford F-350 Crew Cab Lariat 4X2 PSD 6.0 TorqShift Automatic Transmission, MAG-HYTEC DIFF COVERS Bama ZooDad If you think the 6.0 is bad.....Get a 6.4 2004 35 ft Hitch Hiker 16589 EW. Doug Is it time to go camping yet?

11-20-2011, 12:06 PM	#4
BIG JOE SDD Senior Member Join Date: Apr 2005 Location: CenCal Posts: 4,378 Thanks: 101 Thanked 392 Times in 381 Posts	My vote would be for replaceing the Vehicle Speed Sensor first.... also.

11-20-2011, 09:51 PM	#6
BIG JOE SDD Senior Member Join Date: Apr 2005 Location: CenCal Posts: 4,378 Thanks: 101 Thanked 392 Times in 381 Posts	Don't remember when the PSDs went digital but if it's analog.. could be the speedo cable.. or the speedo head itself. The speedo head went TU on my 91. Odometer still worked but the needle jumped all over stop all over the scale.. then it plain Quit working. replaced it for about 100 bucks, IIRC. Joe

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode