Oil pressure stuck at 4, not pegged at 5 (searched)

[djcdmv]

Ever since I got the car last summer, the druck press gauge has been stuck at 4 as soon as the key turns in the ignition. I found a few threads, so I checked all the connections. Funny thing is, when I disconnect the wires from the sender, the needle pegs at 5 (like most say happens when it is a wire/ connection problem). When I reconnect, it drops down to 4, and doesn't go down until car is off. Any ideas? Thanks in advance.

[James Brown]

sounds like the sender is bad, ground the wire and see what happens.

[Kidasters]

Disconnect the wire to the sending unit. Using alligator clips - attach the positive lead to the sending unit. Attach the black lead to ground. Set the voltmeter on OHMS - you are looking for a resistance reading. Start the car. If the resistance changes with RPM - it's the gauge. If resistance doesn't change, it's the sending unit.

Unplugged - resistance is infinite, which is why the gauge pegs at 5.

[hyperkinesis]

where is the location of the oil press sender??? Im a rookie with a new toy....
Im reading a lot so I want to make it works like new

[Germanator]

check this posting, everything you wanted to know and pictures:

Question On Oil Pressure Sender

[hyperkinesis]

what is the ideal oil press on 900rpm cold car and press about 2,500rpm in 4 or 5 gear??

[schumicat]

rule of thumb with oil at operating temp is 1 bar per 1000 rpm. when cold it could be 3-5 at idle, depending on how cold it is and how thick oil is.

Originally Posted by hyperkinesis

what is the ideal oil press on 900rpm cold car and press about 2,500rpm in 4 or 5 gear??

[maliaschwenk]

Disconnect the wire to the sending unit.