No oil temp reading - 1979 930

[e p slick]

No oil temp reading - 1979 930
Anyone know resistance#s or checking procedure for oil temp sender on 1979 930? Thanks - EPS

[Early_S_Man]

Do you have a VDO part number?

[Early_S_Man]

It looks like you will have to remove the sender to find the VDO pn, and to test it ...

Here are a couple of pages excerpted from a VDO catalog [you can rotate and save the first page in Irfanview] downloaded from their site:

[Walt Fricke]

I assume you mean that when you turn the key on, the needle doesn't move? And when you start and run the car the needle still sits where it was no matter what RPMs are involved?

Before measuring or removing much of anything, there are some things you can check pretty easily.

First, see what happens when you take the wire off of the sensor on the engine. With the key on, this should cause the gauge to peg.

If it pegs, time for a new sensor. I think this unlikely given how the sensors are made and what wears inside, but I suppose somehow it could.

If it doesn't, either the gauge is not getting 12V power, or the wire from the engine to the gauge is shorted to ground.

To check the wire, pull the gauge out of the dash and pull the sensor wire off of it with the key on. If it now pegs, the wire has a short in it. How you deal with that one, however, is up to you. Uugh.

If not, you need to check with your trusty VOM to see if the positive terminal on the gauge is getting power. If it is, the gauge has some kind of internal problem. Send it to an instrument shop for repair.

If no power, jumper power to the gauge and see if it works that way. If it does, follow the power wire to see where there is a break or a blown or bad fuse.

Walt Fricke