downshifting is probably the vehicle speed sensor,, i had one go out in
a 93 taurus.. go to auto zone and get them to give you a free check
engine light test(i know the check engine light does not come on and it
is not gonna for the error, but the trouble code is still in the
computer.. i cant remember what the numbers are but go there and have
them do it and put in a new veh. speed sensor and your problems will
probably go away.. on my car after a change out of the VSS it still did
now what to shift and i found out that it was the wires in the line that
broke(not the whole wire), just the copper inside of the wire, the
plastic/rubber around the copper was hiding the break..... i changed the
motor mounts about one month before and must have stretched the wires at
I have a similar problem, on a 93 Taurus, but unfortunately for me, the AZ's
around here only have OBDII checkers, and the 1993 Taurus is too old. :/
Anyone else have any other suggestions? I've tried NAPA, O'Reilly, AutoZone,
Advance Autoparts, and several independant shops.
And, for the VSS, how hard is it to replace and where is it, and whats it
Thank you for the replies, the speed senor was something I was thinking of
but dismissed since my speedo still works fine.
About a six weeks ago I had to lower the engine/trans to replace the
stabilizer bar, perhaps I partially damaged a wire.
you probably did mess up the wires like i did... this is how i would
check the wires... i got the wife's sewing stuff out and got some pins
and shove one in to the wire about a foot or so from where you think
there is damage..( in the case of this with possible damage all the way
up the wire i would take the electrical connection off and use a meter
and check for continuity from the inside of the plug to the extended
part of the wire( shove the pin into the wire and measure there)... did
you have an open circuit??? if so then get some wire from a hardware
store and a pack of butt connetors and replace the damaged wire.......
check on both sides(should have two wires)....
hope you can do it yourself as i had mine brought to the dealership as i
hurt my back and couldnot work on it at the time and it cost me about
$400 for them to change out the VSS and then when they could not get it
to work they found the problem and fixed the wires....
hope this helps.
Well I earn a living designing electronic instrumentation and mechanical
design, so I realy see no problem testing or replacing the sensor.
But still. I don't see why the speedometer is working.
It did happen to give erratic speeds sometimes in the last 2-3 years without
the trans failing.
Well this should be easyer than replacing a transmission. I don"t have a
garrage...or 2K to spare.
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