Speedo/Sensor Issue? HELP!
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Speedo/Sensor Issue? HELP!
Well my 2000 F-350 is starting to act up and it's a first. The last couple weeks the speedometer needle has been going from one side to the other 0-100mph. Also the transmission is having shifting issues along with stalling. It will do it for a while then it will stop and return to normal sometimes. I replaced the OSS sensor on the top of the tranny recently with no improvement. Also I get no CHECK ENGINE lights or No O/D flashing lights. I checked for codes and found 720, 603, and 340 Diagnostic Trouble Codes. The Cam shaft position sensor was replaced about 12,000 miles ago for safety concerns. Could a sensor be defective? I hope MY BUDDIES at FTEF can help me get my truck back on the road.
Hotshot
Joined: Jan 2002
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From: La La Land
I would have expected a flashing O/D Off light, but.....
The Vehicle Speed Sensor (VSS) in the rear differential is probably collected enough metallic "fuzz" to get erratic.
Pull it and clean off the black, ferreous "fuzz" and see what happens. Otherwise, replace it. It's about $25.
Find the wire that goes into the rear differential. That plugs into the VSS. A single bolt removal allows it to pull out of the diff housing.
Pop
The Vehicle Speed Sensor (VSS) in the rear differential is probably collected enough metallic "fuzz" to get erratic.
Pull it and clean off the black, ferreous "fuzz" and see what happens. Otherwise, replace it. It's about $25.
Find the wire that goes into the rear differential. That plugs into the VSS. A single bolt removal allows it to pull out of the diff housing.
Pop
Thread Starter
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New User
Joined: Feb 2011
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I would have expected a flashing O/D Off light, but.....
The Vehicle Speed Sensor (VSS) in the rear differential is probably collected enough metallic "fuzz" to get erratic.
Pull it and clean off the black, ferreous "fuzz" and see what happens. Otherwise, replace it. It's about $25.
Find the wire that goes into the rear differential. That plugs into the VSS. A single bolt removal allows it to pull out of the diff housing.
Pop
The Vehicle Speed Sensor (VSS) in the rear differential is probably collected enough metallic "fuzz" to get erratic.
Pull it and clean off the black, ferreous "fuzz" and see what happens. Otherwise, replace it. It's about $25.
Find the wire that goes into the rear differential. That plugs into the VSS. A single bolt removal allows it to pull out of the diff housing.
Pop
Posting Guru
Joined: Oct 2007
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From: Catawissa, Pa
they have you straight...mine was doing the same thing...with out the shifting problems(6spd) cleaned the sensor and still did it a little less...replaced sensor and all has been well...good luck
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Crazy Speedo Still
Well after changing the VSS senor in the rear axle and the OSS sensor on top of the transmission, my crazy acting speedometer/improperly shifting/stalling truck issues still continue. Could the front wheel sensors be a culprit that is being over looked? It all started one day when I took a (hard)right turn and my over sized tires rubbed the leaf springs and minutes after that the problems arose.
Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
Nope. The front ABS sensors have nothing to do with the shifting logic.
There's still the Turbine Shaft Speed Sensor signal to look at.
Short of getting out an oscilloscope to look at that, or the VSS signal where it enters the PCM, I'm outta' ideas.
Pop
There's still the Turbine Shaft Speed Sensor signal to look at.
Short of getting out an oscilloscope to look at that, or the VSS signal where it enters the PCM, I'm outta' ideas.
Pop
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Posting Guru
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From: Millersburg, OR
Doesn't the computer take readings from three speed sensors(minus the one in the tranny). If they are not close then couldn't that screw up the spedometer. I can see each wheel bearing speed sensor and the rear diff speed sensor with AE. I read somewhere about if they are not all reading the same it will screw things up.
If someone has AE around you you could see if the speed sensors are reading correctly.
If someone has AE around you you could see if the speed sensors are reading correctly.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
The ABS system uses all three wheel sensors. If they don't agree, the ABS goes into action.
The calculated speed uses only the one in the differential.
BTW, there are TWO sensors in the trans, one on the goesinta, one on the goesouta.
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The calculated speed uses only the one in the differential.
BTW, there are TWO sensors in the trans, one on the goesinta, one on the goesouta.
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New User
Joined: Feb 2011
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Could the Superlift TruSpeed be the CAUSE?
I forgot to tell everyone I have a Superlift TruSPEED speedometer recalibrator installed on my truck. Do these units EVER FAIL and if they do, would it create the problems with my truck.
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
Edit: Found the LINK for Truspeed installation
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Just yesterday someone mentioned that they had one, and their original installer had just twisted wires together to do the installation.
https://www.ford-trucks.com/forums/4...l#post10025220
He solved his problems with soldering and shrink-sleeving those connections.
I believe you are very close to pinning down your problem now.
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https://www.ford-trucks.com/forums/4...l#post10025220
He solved his problems with soldering and shrink-sleeving those connections.
I believe you are very close to pinning down your problem now.
Pop