Question about 1998 Mercury Sable

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96 Taurus Speedo and Trans malf replaced the VSS

My Vehicle started acting funny as i was on the freeway, it wouldnt shift into a higher gear and kicked out of gear a couple of times, the speedo droped to 0 jumping to 10 now and again then back to 0. I replaced the VSS with one i got from ford (exact match) and vehicle still wont register speedo and shifts randomly into next gear. I removed the Sensor and checked the driven gear to see if it was still intact and it was. the gauges are analog not digital and its a AX4N tranny.I dont understand whats going on could it be a bad sensor i got from the dealer? Please Help

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Could be one of three things 1) could be a bad sensor 2) could be a wiring concern 3) could be a computer concern

Posted on Mar 01, 2009

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RJones1125
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SOURCE: Car's Speedo wont work and tranny malf

inspect the throttle valve control rod. there could be a small part that has worn out, usually made of plastic and the size of a dime. if this part is missing out worn out it will make the trans shift at the wrong time. it happened to my lincoln once and i thought the trans was going out.

Posted on Feb 24, 2009

6ya6ya
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Posted on Jan 02, 2017

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1 Answer

1992 Subaru legacy wagon will not shift up from first gear. it is an AT.


run the fault but all you describe is operated from the VSS sensor ( vehicle speed sensor)
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a real DTC code.
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the means VSS is dead, vehical speed sensor (miles per hour)
so , that begs the question is the speedometer dead or odometer
dead or acting funny IN ANY WAY?
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Auto or stick, ill pretend, AUTO.
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quote FSM:
Accords and Preludes use an external sensor mounted on top of the power steering speed sensor in the engine compartment. The power steering speed sensor is gear-driven and controls the steering boost in relation to the speed of the vehicle. An electric pulser unit is mounted on top of this unit and is coupled to it by a small shaft. The motion from the lower unit is transferred to the upper unit; the resultant electrical signal is sent to the appropriate control units.

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on newer cars 1996 (on avg) the sensor is on the tail shaft. and in speedo.
on very new cars there are 3 VSS.... (dont ask)

on my 96 car, the tranny VSS can fail and then FALL back to the
SPEEDO head. and tranny still shifts but is funky,
the FSM covers all this, i recommend getting one, to understand
how it all works.

your car has and electronic speedometer
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the PCM then sets the speedo dial, and uses this info to run TCM
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your orange wire signal is dead or flaky.

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The trans filter has nothing to do with shifting,
you surely are knowlegeable enough to know that

If you were out of money, you would be riding a bicycle
& eating at a soup kitchen

Take it to a trans repair shop

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1 Answer

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2 Answers

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93 and up are shifted by the computer. If the VSS is bad, it does not know you are moving. The speedo is on the driver side of the tail houseing to the trans.

If you do replace it and nothing happens, you will need to diagnos the signal to the computer or the computer itself. However it is more likely that it is the speedo itself.

Hope this helps.

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1 Answer

96 Ford Taurus Speedometer Drops to Zero


have the fault codes read
the speedo gets its signal from the VSS ( vehicle speed sensor) and that sensor also reports to the transmission control module
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Mar 19, 2017 | 1996 Ford Taurus

1 Answer

Car's Speedo wont work and tranny malf


inspect the throttle valve control rod. there could be a small part that has worn out, usually made of plastic and the size of a dime. if this part is missing out worn out it will make the trans shift at the wrong time. it happened to my lincoln once and i thought the trans was going out.

Feb 24, 2009 | 1996 Ford Taurus

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