why do TD speed sensors blow

[QKsilverF1]

My speed sensor breaks like once a year. anyone have any ideas as to why? the car has a quaife and a solid bobble strut so that might have something to do with it.

[cybermrc]

How are they broken?

I've got a solid bobble strut and I've never broken the same one I've had in my car for years.

[QKsilverF1]

the sensor just craps out, my speedo will bounce all over the place, then i replace it with a new one and its fine

[minimopar]

You might want to make sure the pins on the connector are making good contact and the plug isn't soaked in oil. They don't last long because they are just a glass-enclosed mechanical switch, but they should last longer than a year.

[turbovanman]

What brand are you using?

Is the case or sensor housing cracked at all?

[QKsilverF1]

im using a mopar sensor, last time i had the tranny out nothing was cracked. the oil pan gasket leaks a lil so it might be oil getting on it.

[turbovanman]

Weird, very weird. How the heck does the oil pan get the sensor covered, the sensor is higher up?

I would do what Russ suggests and check your wiring and connector!

[QKsilverF1]

where the oil pan meets the block is higher up than the sensor

[orion]

same as cybermrc

[Phreakish]

can be lots of things - I opened mine up and redid the internals on my 2 wire sensor. The wires broke off mine, so I resoldered them to the glass sensor inside, and cleaned up the 'flying magnet' in there too (was quite rusty, dirty, grimey, etc).

I suspect that if the speedo is jumping around, that the magnet might be turning on the shaft, I was able to turn mine fairly easily, so I glued the sucker in place real good with some superglue (model airplane type). Havn't had a problem yet...

[minimopar]

You can sometimes eek a few more miles out of one by bending the metal tab inside to bring the contacts closer to the magnet.

[GLHNSLHT2]

Why not just install the later 3 wire sensor??