Please identify these sensors for me...

[HFR_Racer]

I'm experiencing low oil pressure readings from my druck guage and I need to resolve this issue.

I assume that sensor #1 in the photo is the low oil pressure lamp sensor. Is that correct?

I believe that sensor #2 is the oil pressure sending unit. How do I remove the plastic connector without breaking it? Simply pull straight up?

I assume that sensor #3 is the oil temp sensor? Is this correct?



My oil pressure sits at 1.5 bar on my druck guage at all rpm levels. I plan to check with a mechanical guage tomorrow. Should I assume that my oil pressure sending unit is bad or just clean the contact to the sensor? I see that this is a common issue, but I wanted to identify the sensors before I begin digging further.

[James Brown]

#2

[Flat6pac]

Pull the connector straight out for the oil pressure and then inside the connectorsqueeze the connector connection to slightly deform it, replace. That will be good contact.
#1 is oil temp sender
#2 is oil pressure
#3 is engine temp for the Lambda system

Bruce

[scarceller]

Unplug connector from #2 and then ground the wire the gauge should peg. Also, you really want to be 100% certain you don't have low pressure for some reason. I would not drive the car till you are sure.

[HFR_Racer]

I disconnected the wire and the guage shows max pressure. I grounded the wire and the guage shows zero.

I cleaned the contact at the switch with contact cleaner (it was pretty dirty). I'll also slightly crimp the connector because it does have a very loose fit. I also checked the wiring harness contacts behind the druck guage and it looks like new (no cleaning needed).

I'm checking the wiring diagram now to see if there is any other connection locations I should clean.

I plan to install a mechanical guage if I can't get a good reading from my druck guage.

Thanks for everyones input...

[scarceller]

Originally Posted by HFR_Racer

I disconnected the wire and the guage shows max pressure. I grounded the wire and the guage shows zero.

That's correct behavior sorry I had it backwards.

[HFR_Racer]

I spent this evening removing my oil pressure sensor. I found it challenging, but you can remove the A/C compressor bracket with the engine in the car. I chose to remove the AC compressor bracket and the oil line due to the limited access.

I'll install a mechanical guage tomorrow and I'm hopeful that my actual oil pressure is ok and that it is the sending unit that is bad.

If I shake my suspect sending unit slightly I hear and rattle inside. Any ideas if this means it bad or not?

[HFR_Racer]

This evening I installed a mechanical oil gauge and all is well.....

35 psi at 1k rpm (cold)
55 psi at 2k rpm (cold).

I didn't trust the low budget fitting that I fabricated to hold my mechanical guage so I didn't run it long enough to get it hot.

My druck guage tested good..

The oil pressure sending unit rattles a bit and I assume therefore it is bad.

Does anyone have a testing method to prove the guage is wrong? If the sensor works based on resistance can't I simply hook the sensor up to a regulated circuit and pressurize it with my air compressor? Then I could check for resistance levels at various input pressures (using compressed air). Does anyone know the approximate resistance levels I should be looking for? Maybe I should simply just look to see if the resistance changes to prove the pressure sensor is bad?

This sounds logical to me.. Anyone else tried it??

[Eagledriver]

You are correct that the sender just varies the resistance based on pressure. It is almost certainly bad since the guage tests good. If you want to check the sender with an ohm meter you should see essentially no resistance with no pressure and progressively higher resistance with pressure. You could just re instal and check the resistance to ground when the engine is running or not running. I suspect you'll see a constant resistance based on what your guage is doing.

-Andy