Muf

Can anyone help me please with a very small problem I have with the oil pressure gauge?
The gauge reads fine until the '4' mark. When the pressure increases beyond, the hand flies off the gauge and crashes into the upper stop. When the pressure decreases, it returns back to 4 and less.

Does anybody have an idea what can be wrong? I suspect the gauge. I have removed it to see what is inside and found that it is very difficult to disassembe further on.
The only thing that I found that could be wrong is some sort of reel with a wire rolled on it. I am not sure whether it is a ressistor or coil or what but at one end the wire was messed up a little while the rest of it was perfectly regular.
Would anybody know what is that part and whether this wire crossings and irregularity can be the source of my problem? Can I substitute it with some stock part?

Thanks very much.

porsche_911_s

You might want to hook up a meter to the wires with the gauge out of the equation. If you get a spike even when the gauge is out, it would be something in the wiring or the sending unit.

CrossT

I had the same thing going on and traced the issue to the wiring connector at the sender. I re-wired the connector and cleaned the ends and the problem went away.

mine is an 86

todd

DGaunt

I'd bet on the sender. It is in a fgar more hostile enviroment and has more heat and stress on the moving parts. good l uck.

Ellsworth Wente

I had the same problem a few years back. bad sender or flaky connecter at the sender - when the circuit goes open the guage needle goes full scale. since you're getting some readings up to a certain point, it's likely a bad spot on the rheostat inside the sender unit. it's kind of a bear to get out, you need a large crows foot wrench (I think it was 24mm & I had to order one from snap-on)