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Old 09-22-2006, 12:32 AM   #1
nickouellettesvt
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Speedometer jumping

I noticed today that my speedo is jumping wildly from like 40mph-65mph, then when I get to 90mph its drops to 80 then back to 90. Whats up with that? is it an ECU, or the wiring in the speed sensor in the tranny?


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Old 09-22-2006, 09:24 PM   #2
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Let's say you're doing 60 and the speedo drops to 40. Will it stay at 40 for some period of time (even if it's only a few seconds), or does it just drop and instantly return. Where I'm headed with this is I would suspect wiring/connections problem if the problem corrects instantly, some sort of component failure if the problem lasts for a period of time.
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Old 09-22-2006, 09:42 PM   #3
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Sounds like the Vehicle Speed Sensor (VSS). Check the forums for this...

(been there, done that)
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Old 09-23-2006, 01:32 AM   #4
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yea its an intstant jump...so the vss is the sensor that connects in to the tranny...?
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Old 09-23-2006, 03:33 AM   #5
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It's mounted on the top of the bellhousing, drivers side. It's almost impossible to see.

Having the speed sensor go out seems to affect the ECU as well.
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Old 06-07-2013, 10:00 PM   #6
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Got the same problem, replaced the sensor, didn't solve the problem

I don't know what to think.
Did Ford dealership sell me a bad sensor?
Or Is it bad wiring?
Or Is it my forward drive side wheel speed sensor that is going crazy?

Tomorrow I should be back with a scan of the ''Check engine'' code.

Thanks for the help. Driving to work is getting very sketchy...

Here's my story:

It all begins when my forward driver side brake seized. I removed my caliper for two days, lost a lot of brake fluid. Re-installed the caliper, fulled my reservoir, installed new brake pads. Compressed the piston, fluid spilled out of the reservoir. Cleaned as much as I could with what I had left of brake cleaner. Then re-installed the wheel, was trying to go to fast so I forgot to torque the nuts... Went for a test ride, heard crackling sound, drove with that sound for a minute before I realized what was going on. Torque the wheel properly, then I drove 45min to my parents' house, brake is still a little sticky after a hard braking... but no big deal. Rinsed the area around the brake fluid reservoir (with water- yeah, stoopid, I know). On my way back home, got the jumping speedometer, especially at low speeds (30mph +/- 10mph). Cleaned the connector and plug, didn't work. Replaced the plug, didn't work. And here I am. (Believe me or not, I really tried to keep the story short)
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Old 06-08-2013, 11:36 AM   #7
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Had the exact same problem, and replacing the speed sensor completely sorted it, i would check that first.
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Old 06-08-2013, 11:42 AM   #8
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Quote:
Originally Posted by TheSheerOg View Post
Had the exact same problem, and replacing the speed sensor completely sorted it, i would check that first.
Which sensor? VSS or wheel speed sensor?

Because I've already replaced the VSS. (the one connected to the transmission)
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Old 06-08-2013, 11:43 AM   #9
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Ah woops VSS, sorry Nerlyx i was replying to OP, didnt realise how old this thread was !
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Old 06-08-2013, 12:09 PM   #10
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Quote:
Originally Posted by TheSheerOg View Post
Ah woops VSS, sorry Nerlyx i was replying to OP, didnt realise how old this thread was !
Hehe no worries, good to know that it replacing VSS solved the problem for one more of you... it reinforces my idea that I received a bad sensor from ford.
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