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Got a weird one
#1
Question 
I have noticed that not only does my speedometer not read accurately (replaced sensor at transmission- no joy)
It also reads differently based on ambient temperature.  Colder= less accurate.  Warmer= more accurate 
Neither is correct.. but when it is hotter outside.. it is closer to my actual speed….    ((Shrug))

Weird- hhuh?
My body is a temple- Ancient and crumbling,  
probably cursed 


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#2
The speedometer on my 1998 Safari usually shows a speed that is 15 mi faster than what we're actually going.  I finally adjusted to this discrepancy to my actual speed.    It still startles me when I look down and my speedometers clocking us at 100 miles an hour   Huh
  I DON'T GO CRAZY
Tongue      I AM CRAZY          
   I JUST GO NORMAL FROM TIME TO TIME
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#3
Bizarro World ?

TJB
85mph might be a bit extreme in that old Safari ..
stay tuned 
popeye


 Weirdo Overlord : FMS Fleet Ops , Awards , Badges ,  aka Tamerlane the Impaler Mod.
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#4
Mine is a proportional discrepancy..
at lower speeds it reads almost correctly.. but as I go faster, the difference is more noticeable..
Almost like a percentage of error.. and also the percentage is affected by ambient temp
My body is a temple- Ancient and crumbling,  
probably cursed 


Dog Bender with 4.2 Stinkin' Badges 
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#5
My 1989 Ford E350 Class C has the proportional increase issue. Temperature would affect mechanical components such as clock springs.

Didn't know about it until California was resurfacing CA-127 South from the Nevada line with a 55 mph limit in the construction zone, usually 65 mph. I was doing 55 mph, according to my speedometer, but the warning sign was flashing my speed as 58 mph, I was the only vehicle on the road at that time.

I turned my phone's GPS on and used a GPS speedometer app to check the differences at 25, 35, and 45, at 25 it was minimal, increasing as the indicated speed went up.

I don't drive over 55 anyway.
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#6
You dont have any strong magnets in vincinity of speedo do you?

One x country journey west to east, in Louisiana, I-10, maybe I-12, late at night, my speedo needle started bouncing from a steady 65mph, at one point ranging from 45 to 80mph.

I was like "great, my speedo cable is about to snap"

Fiona awoke from her perch on reverse facing seat armrests, and started barking whining, tail wagging, like a person was sitting in my back seat.

15 miles later the speedo needle and Fiona were calm, steady.
3 more cross country trips since, maybe 5, and it has not reoccurred.

No idea other than a bizarre magnetic anomaly.
[-] The following 1 user says Thank You to sternwake for this post:
  • GypsyDogs (06-03-2023)
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#7
No Stern, no magnets of any significance nearby

My discrepancy is a bit more than that, Wayne

At 60 deg.. (These are all ish) 20=25 30=45 40=60.
At 80 deg .. 20=22 30=35 40=50

I am having to rely on a speedo app
My body is a temple- Ancient and crumbling,  
probably cursed 


Dog Bender with 4.2 Stinkin' Badges 
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#8
Does anyone actually obey the speed limits these days ?
No proof available uptah camp.
If you're not passing everything in sight , probably OK.
stay tuned 
popeye


 Weirdo Overlord : FMS Fleet Ops , Awards , Badges ,  aka Tamerlane the Impaler Mod.
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#9
I hate tickets…
My body is a temple- Ancient and crumbling,  
probably cursed 


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#10
I remember disconnecting the cable and cleaning up everything on several different vehicles. Most of the time it repaired the problem. Once I had to change a gear at the transmission.
Compared to parenting, Cat herding is less complicated
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