Rsingh7

comes on during startup and stays on..
I never had this problem before,

Checked the oil, its all the way full, changed it about 100 miles ago.


As far as the bar being past 5..I don't know why this is happening..also why does my engine oil light come on!?

Any suggestions?

Scot66

I'm having the exact same problem (92' 100CS)

Rsingh7

since it shoots up to 5 bar after starting..and I think overheating caused the sender to burn or something..anyone know the location of them?

A6Gary

Your pressure at idle should be 1.0 - 2.5 bar (at the oil pressure sensor in upper oil pan).

Decolliber

... that oil pressure sender needs to be replaced. When sender is bad the pressure indicator just pegs itself at 5.
Another alternative is a bad gauge. The way to check for the latter is to hook up a potentiometer (variable resistance) to the electrical input contacts at the gauge; then add battery power to the circuit and you should be able to generate different oil pressure indications by varying the reistance in the potentiometer. I bought one at Radio Shack for a few dollars. In my 911 I was able to generate oil presure from zero to 5 bar just by turning the dial on the potentiometer, so I knew the sender was bad. Getting the sender out is another matter. If it has been in there for years you may need to use a breaker bar! Spray around it with some corrosion dissolver for few days before attacking it.
A much more remote possibility is that gauge and sender are OK, but you have a broken wire to the sender. You can check for that by removing electrical leads at the sender, inserting potentiometer in its place, and varying resistance. If you cannot generate different oil pressure indications by this method (and you have verified that the gauge is good), then you have a broken wire.