vinyl_tien

My car is a 89 S4 manual, it usually show 3 bar when over 3000rpm(even 4000 rpm show 3 bar), and 1.5 bar when idle.

I had replace a new oil sender one half year ago, but thing don't change.

Today I had change two springs in oil sender, it did not change when I first start my car same 3 bar when over 3000rpm, and 1.5 bar when idle.

But one thing happen after I restart it , I press full throttle, than the needle stick in 5 bar and never back to 0 bar when power on.

Right now, when power on, the oil pressure needle only show 5 bar, no any number.

So where should check first? I really need you guys input.
Many thanks!
Tien

Leon Speed

I think that's a sign of a loose connection at the sender or the connections are reversed (although I seem to remeber the connector is keyed so it only fits one way). Anyway, check if the connections on the oil sender are clean and tight.

vinyl_tien

Hi Aryan
I will check that tomorrow. But I believe the connect should be one way only. Because first start is normal, second time with full throttle make trouble.
Many thanks!

cfc928gt

Sounds like you need a new oil pressure sender.

Speedtoys

Would a gauge always atw 5+ on the dash, key on or off, also be a sender issue?

jpitman2

pegged at 5 sounds like a jammed gauge, or cross wired at the sender.
jp 83 Euro S AT 54k

vinyl_tien

Hi
When Key off, speedo no power then the needle will drop to 0 bar, When key on will right up to 5 bar

jpitman2

That sounds like crossed or shorted wires at the sender, or between it and the gauge...
jp

T_MaX

Go back to your last task (or two) and see if you have some connection problems or a bad sender. As for the other oil problems, you may want to verify gauge readings with a mechanical gauge to see what your oil pressures are at different temperatures and RPM.

vinyl_tien

Thanks every one, problem solve, a broken cable on oil pressure sender
Many thanks!