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Hey yall, dealing with the classic "speedo isnt working on cluster" ive already sent mine away to be fixed and was told the cluster wasnt the problem so I figured I might as well change the speed sensor. I see alot of speed sensors online and threads on here where someone has bought the wrong 1984 sensor. A solid answer on what type and a picture would work great as they are expensive and id like one thats going to work on my '84. Thank you
Since all '84 were 3.07 or + rear axle the VSS is a 'center-connect' GM# 25007339 repl by 25007308 so any that you found that are thought to be a correct replacement for those numbers should be correct. There's no inexpensive option out there. You might try to find someone parting a car and purchase a used. You need to make sure that whatever you consider used has 40-45 on the connector side of the VSS. I believe it should be black.
A '91 - '93 A4 that has the 'perimeter connect' could also work but it's a very difficult find. It has to be for an A4, the 'perimeter connect' for an M6 I don't believe will work with the A4 extension housing but if yours is a 4 + 3, then I don't know because I've never tried one. That GM# 10456092 I've mentioned in the past is maybe the most difficult VSS to find.
I believe I have snapshots on a very old PC and if I can fire it up later, I'll try to post a couple.
Your current VSS, if original I believe should be black, 'center-connect' and have 40-45 on it.
*** You might want to rule out other possibilities before purchasing a VSS. A bad connector at the VSS? Could the drive gear retainer have failed? There're things to do before setting out for a VSS purchase. You didn't mention if the car is an A4 or maybe a 4+3. Which is it?
The VSS signal is weak, and also susceptible to electro magnetic interferance, so look at the wires and connectors first, and makes sure it's away from any ignition system and fuel injection system wiring, alternator, relays.
For extra credit, can also try a shielded twisted pair with the shielding grounded on one end if you're handy with wiring. About $2 per foot for 20awg or 18awg. New Deutsch DTM connector to replace the old GM stuff if you want to go ***** out, DTM-02 on one end and a DTM-03 on the other with the ground wire. https://www.aircraftspruce.com/catal...shieldwire.php
Hey yall, dealing with the classic "speedo isnt working on cluster" ive already sent mine away to be fixed and was told the cluster wasnt the problem so I figured I might as well change the speed sensor. I see alot of speed sensors online and threads on here where someone has bought the wrong 1984 sensor. A solid answer on what type and a picture would work great as they are expensive and id like one thats going to work on my '84. Thank you
my apologies, its an automatic, how could i check for these things you mentioned could be wrong? I got under the car real quick a couple days ago and checked it out and it was plugged in, not sure where else to go from there, new to VSS mechanics, anything helps!
Since all '84 were 3.07 or + rear axle the VSS is a 'center-connect' GM# 25007339 repl by 25007308 so any that you found that are thought to be a correct replacement for those numbers should be correct. There's no inexpensive option out there. You might try to find someone parting a car and purchase a used. You need to make sure that whatever you consider used has 40-45 on the connector side of the VSS. I believe it should be black.
A '91 - '93 A4 that has the 'perimeter connect' could also work but it's a very difficult find. It has to be for an A4, the 'perimeter connect' for an M6 I don't believe will work with the A4 extension housing but if yours is a 4 + 3, then I don't know because I've never tried one. That GM# 10456092 I've mentioned in the past is maybe the most difficult VSS to find.
I believe I have snapshots on a very old PC and if I can fire it up later, I'll try to post a couple.
Your current VSS, if original I believe should be black, 'center-connect' and have 40-45 on it.
*** You might want to rule out other possibilities before purchasing a VSS. A bad connector at the VSS? Could the drive gear retainer have failed? There're things to do before setting out for a VSS purchase. You didn't mention if the car is an A4 or maybe a 4+3. Which is it?
my apologies, its an automatic, how could i check for these things you mentioned could be wrong? I got under the car real quick a couple days ago and checked it out and it was plugged in, not sure where else to go from there, new to VSS mechanics, anything helps!
my apologies, its an automatic, how could i check for these things you mentioned could be wrong? I got under the car real quick a couple days ago and checked it out and it was plugged in, not sure where else to go from there, new to VSS mechanics, anything helps!
The loose or failed drive gear retainer requires a visual inspection that can be done through the VSS orifice in the extension housing. You need to be very careful when removing older VSS, they're easily broken while removing. With the VSS removed you could spin to check with a rotary device and expect an AC voltage output if working. No output suggests failed VSS. Often the failed retainer would have started out as very intermittent and erratic speedo operation. Did yours just fail one day all of a sudden or ......? You mentioned 'connected' but that doesn't validate the condition of the wires to the connector. Replacing the connector could be considered a reasonable next step maybe.
The loose or failed drive gear retainer requires a visual inspection that can be done through the VSS orifice in the extension housing. You need to be very careful when removing older VSS, they're easily broken while removing. With the VSS removed you could spin to check with a rotary device and expect an AC voltage output if working. No output suggests failed VSS. Often the failed retainer would have started out as very intermittent and erratic speedo operation. Did yours just fail one day all of a sudden or ......? You mentioned 'connected' but that doesn't validate the condition of the wires to the connector. Replacing the connector could be considered a reasonable next step maybe.
I bought the car used and the speedometer was not working, just now getting around to getting it fixed, i have sent the cluster in before for inspection and repair and was told the issue was something else
I bought the car used and the speedometer was not working, just now getting around to getting it fixed, i have sent the cluster in before for inspection and repair and was told the issue was something else
Start from scratch and confirm the information on yours. Should be black and be center connect w/40-45 visible near the connector. Do you have the FSM(Factory/Field Service Manual) for your car?
This is a pic of when i tested my VSS.
The vice grip pliers are lightly attached to keep it from flipping around when i pull the trigger on the drill. The meter is set for AC voltage.
1984 corvette speed sensor
