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Re: Oil Sender pegged when ignition is on. Please Help!
You disconnected the lead at the sender and gauge returns to zero, indicating there is no short anywhere. If there was teflon tape on threads, the gauge would read very low or zero, so that's OK. I would try another sender. Even though you just replaced it, I've seen em bad out of the box. Not often, but it happens. The sender should read between 240 ohms (zero oil pressure / zero reading on gauge) and 33 ohms (80 PSI, I think it is, on the gauge), which is same value for a temp gauge sender (may be able to connect oil sender wire to temp sender on warm engine and read mid-scale on gauge, if gauge is good) . If the sender is giving you these values with the lead disconnected and using an ohmmeter thru it to ground, then it's the gauge. If values are off, it's the sender.
I just went and purchased a mechanical oil sender to make sure we had pressure, and it worked perfect.
The ground system completes the circuit. If you touch a wire that is grounded to the sender, the gage should "peg" (if the wire from the sender to the gage is still connected) more
At the gage, disconnect the sender wire. What is the resistance from the wire to the case of the gage? [links]
The oil pressure circuit is just a simple variable resistor (the sender) a single piece of wire, from the back to the front, a gage and a power source. more
This is a common sign of a failing oil pressure sensor. This is a small unit in the engine block that reads oil pressure inside the motor and relays this information to the vehicle’s computer as well as the oil pressure gauge. When this is not working it may cause the gauge to display intermittently incorrect readings, sometimes saying 0 pressure and sometimes max (in this case 80 psi) or sometimes it fluctuates erratically. When the engine not running it is normal for it to read 0 since the oil pressure is created by the engine running. To have this corrected, I would recommend having a certified professional from YourMechanic diagnose the odd oil gauge behavior and assist with repair.
My car has 140000 miles.
My car has an automatic transmission. here
Once I turn my truck on my oil gage automatically shoots straight up to 80 psi. If I turn turn the key forward without starting the vehicle it stays at 0 but once the truck is on it goes straight up to 80 and doesn't move while driving. more
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If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. here
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Just spoke with my mechanic, his first thought is that it is the oil pressure switch (cost cdn$100/US$65, plus 1/2 hour labour for re & re) but might be sticky gauge ( few 100 $, plus couple hours labour). My mechanic has a good reputation so I do not feel that he is leading me astray. however I have only had the car for a month and a half and would like to be armed with as much knowledge as possible when I bring the car in to the shop next Wednesday. Do these sound like fair assessment of the problem? Because the needle does move, I am inclined to believe that the switch is the likely problem. Is there anything else that it may be that I should be aware of?
Regarding the pressure dropping after warm up, no it does not drop after the car has reached operating temp. Needle stays pegged over 5 bar. here
Does the pressure drop after the engine warms up? It is normal for the oil pressure to be pegged at idle when the engine is cold. As the oil thins during warm up, the idle pressure will drop to the 1.5 - 3 bar range. more