Wild Speedo Needle - Known Fix?
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Tuned
Joined: Jun 2023
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Wild Speedo Needle - Known Fix?
96 F250. E40d. 5.8.
My speedometer needle goes a little wild above 50mph, especially around 65mph. Is this a known problem with a known fix?
I thought about taking the cluster out and spraying contact cleaner, but that's no fun if I can avoid it. Maybe there's another cause?
Thanks!
My speedometer needle goes a little wild above 50mph, especially around 65mph. Is this a known problem with a known fix?
I thought about taking the cluster out and spraying contact cleaner, but that's no fun if I can avoid it. Maybe there's another cause?
Thanks!
Hotshot
Joined: Jul 2020
Posts: 10,456
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From: Near Salt Lake City
Depends on whether it has a cable or not
The electronic ones with a VSS usually need a new VSS for your problem and not a speedo
The cable operated ones will need to be lubed or the cable and housing replaced
Does it fluctuate at low speeds?
Does the cruise control surge at freeway speed when the speedo goes nuts?
The electronic ones with a VSS usually need a new VSS for your problem and not a speedo
The cable operated ones will need to be lubed or the cable and housing replaced
Does it fluctuate at low speeds?
Does the cruise control surge at freeway speed when the speedo goes nuts?
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Tuned
Joined: Jun 2023
Posts: 318
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Depends on whether it has a cable or not
The electronic ones with a VSS usually need a new VSS for your problem and not a speedo
The cable operated ones will need to be lubed or the cable and housing replaced
Does it fluctuate at low speeds?
Does the cruise control surge at freeway speed when the speedo goes nuts?
The electronic ones with a VSS usually need a new VSS for your problem and not a speedo
The cable operated ones will need to be lubed or the cable and housing replaced
Does it fluctuate at low speeds?
Does the cruise control surge at freeway speed when the speedo goes nuts?
Could it *also* be cable operated?
It does not fluctuate at low speeds (so far as I can tell so far.)
The cruise control stays steady regardless of the speedo fluctuations. I specifically tested and noticed this. So when I'm cruising at 75, and the needle is dipping down to 60 and up to 80, the truck speed seems to remain steady.
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Tuned
Joined: Jun 2023
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I replaced the VSS (twice, since the problem didn't go away) with good replacements. No change. I've also removed the RABS module, not sure if that matters, but the speedo was worse with it in (and so was the transmission - whole other issue).
So does that mean it's down to the PSOM? Can you tell me the procedure from here?
So does that mean it's down to the PSOM? Can you tell me the procedure from here?
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Tuned
Joined: Jun 2023
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Sorry, I forget the forums are general. 96 F250. 5.8. E40D
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Tuned
Joined: Jun 2023
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About the tone ring, I know what these are in general but not where they are in the F250. Can you tell me? Also, I removed the RABS module to make the tranny shop shifting wildly (and to calm the speedometer, as it was worse before). Does that play into things at all?
I guess what I could really stand to know is, what system is this part of? Meaning, if I look for videos on how to replace the tone ring, am I looking for e40d videos? videos pertaining to the axle? The 5.8?
Lead Driver
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My late junk are manuals. I do know the PSOM is a known issue as the electronic bits die, similar to the PCM.
I would start with testing the fresh VSS. Then its wiring back to its end point (cluster or PCM?). These trucks are old, so everything craps out with age eventually.
Best to do is buy an EVTM for your model year and start testing stuff.
I would start with testing the fresh VSS. Then its wiring back to its end point (cluster or PCM?). These trucks are old, so everything craps out with age eventually.
Best to do is buy an EVTM for your model year and start testing stuff.
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Tuned
Joined: Jun 2023
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Okay, cool. I'll probably just skip worry about it in that case. But this is really good to know. I'll focus on the electronics stuff.
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Tuned
Joined: Jun 2023
Posts: 318
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My late junk are manuals. I do know the PSOM is a known issue as the electronic bits die, similar to the PCM.
I would start with testing the fresh VSS. Then its wiring back to its end point (cluster or PCM?). These trucks are old, so everything craps out with age eventually.
Best to do is buy an EVTM for your model year and start testing stuff.
I would start with testing the fresh VSS. Then its wiring back to its end point (cluster or PCM?). These trucks are old, so everything craps out with age eventually.
Best to do is buy an EVTM for your model year and start testing stuff.
I mean, maybe this isn't a big deal or anything to worry about. I just figured I'll replace or clean the easy things.
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