Can you post a video showing the mechanical gauge you installed during startup?

We can take videos of our engines during startup for comparison reference.

_________________
http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

I have a link for a video of the cold start and oil gauge. This is a cold start and psi is at 75psi

https://youtu.be/BvkjBTHkD64

The engine sounds good and the oil pressure seems good.
As you can see, not having a oil pressure switch is not a reason for the engine to shut off.
Not sure what was causing it to shut off while driving, but it wasn’t the oil pressure switch.

_________________
U.S. Army Retired

I scanned the check engine light and got back PO299 turbo/supercharger underboost. Would this be causing this issue? Also how do you check the vacuum lines to insure everything is operational

I’m at the point of giving up on this. I checked all the vacuum hoses and connections the connection on the engine side of the air box was loose and I pushed it back in. The cel for the boost went off. I started the engine and had 75psi for oil pressure after about a min it dropped to 50psi and after 3 mins down to 25psi.

Not sure if it has anything to do with this but now the power steering is having issues and acts like the pump is going bad( no issues prior to the turbo problem). Possibly a serpentine belt issue

ok before you lose your cool , lets remove oil filter and cut it open and check if any metal particles in it ?

I cut the oil filter open. I could not find a sliver of a metal anywhere. I used a strong magnet to go over the entire thing. I have used rotella t6 and k&n filter Since I have owned it (60,000 miles). Is it possible I did something wrong with the turbo install? It was pretty straight forward...

good , no metal in oil filter , engine NOT making noise ,but oil pressure light is on again , so you did try new pressure sending unit ?? at this point you stated that oil pressure is dropping down to 20 psi at idle after 3 min . 20psi is ok if engine is HOT and if it was running longer then 3 min, so , can you get it little hotter and run it longer then 3min and let us know what is the oil pressure at engine full operating pressure and if any noise from this engine as you revving up to 2000 rpm and back down to idle . also what turbo did you install new or reman ? again get that engine to full operating temp and you will get better idea what is going on.

I don't have my DRBIII with me otherwise I would watch the oil pressure at hot.

Anyone else with an oil pressure gauge can confirm the reading at hot idle?

OP what oil are you running?

_________________
http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

New Garrett turbo installed. Brand new oil and filter were installed. Below are the oil pressure readings cold engine 28 degrees:

Start up-75psi
1 minutes-75psi
2 minutes-75psi
3 minutes-50psi
4 minutes-50psi
5 minutes-45psi
6 minutes-40psi
7 minutes-40psi
8 minutes-35psi
9 minutes-35psi
10 minutes-30psi
11 minutes-25psi
12 minutes-25psi
13 minutes-25psi
14 minutes-25psi
15 minutes-25psi

AT 15 minutes I brought the engine up to 2,000rpm. Not strange noises. oil pressure went to 50psi and then back to 25 psi at idle.

I am getting a humming noise from the turbo vacuum modulator

My 2 cents on excessive pressure drop after warm up:
50 psi drop seems excessive! 1/3 to 1/2 of 'cold' is more in range. You are 2/3rd's..
Sometimes it's the little things that are missed;
Incorrect oil.
Oil level too high, and is whipped up into a froth.. takes a few minutes to cause lower pressure.
You have some crap in the sump, that is getting pulled up and covering the intake screen. Shutting the engine off allows the crap to settle, and next start up is good until it's sucked up again.. But this engine really doesn't have anything 'available' to chew up and drop into the sump.. (ie; timing components, chain guides, plastic coated timing gears etc)

Stuck/worn/weak bypass valve. I haven't had the opportunity to 'explore' this engine this deep yet.., I assume the bypass flow is what goes to the cooler.. And I don't know if the bypass is part of the pump, filter head, or somewhere in between.
I see you have 'responsive' pressure, when you rev it. That's a good sign.
IIRC, I thought I saw once in FSM that VM wants 25 psi minimum hot idle pressure?

_________________
2006 KJ CRD, bought 9/11/14, 70,500 miles. Circulating Rotella T6 5w-40
11-3-14 oem stat installed
11-5-14 gen II FH installed.
Sasquatch elbow kit, samcos, GDE eco FT. 11-26-14
80,500 miles, engine is disassembled, awaiting parts 3/18
Budget?? Sure! 'Everything I have'.
New "Pet" name for My Jeep; 'Soul Sucker'

Most engines have an oil pressure relief on the discharge side of the oil pump that relieves pressure on the system and dumps it back into the crankcase.
If it sticks open or partly open, it could cause a low oil pressure condition.
According to the FSM, the oil pressure relief valve is inside the oil pump.

These are the recommended solutions from the FSM for low oil pressure:

No. 10 -- Excessive bearing clearance requires bearing and / or rotating parts to be renewed.

Oil diagram for this engine:

_________________
Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve

Thanks for the schematic WW. Corrects my assumption!
Full flow through the cooler, down to the filter, and up to feed the system.
Bypass simply dumps internally to sump?

_________________
2006 KJ CRD, bought 9/11/14, 70,500 miles. Circulating Rotella T6 5w-40
11-3-14 oem stat installed
11-5-14 gen II FH installed.
Sasquatch elbow kit, samcos, GDE eco FT. 11-26-14
80,500 miles, engine is disassembled, awaiting parts 3/18
Budget?? Sure! 'Everything I have'.
New "Pet" name for My Jeep; 'Soul Sucker'

lacrosseman 2010. your oil pressure is good for now 25 idle and 75 high idle (after 15 min) at this time i would install t fitting and install new sending unit and hook up your mechanical gauge at same time and strapped it to wiper blade and go for road test , uphill and get it up to temp , and let us know what do you see on that oil pressure gauge and is oil light still on at idle after road test ? dont blow it up just drive normally

You should replace both vacuum solenoids.

_________________
U.S. Army Retired

Low oil pressure light is controlled by ECU, if the sensor is reading correct per the mechanical gauge then the ECU has turned the light on then its fair to say the ECU thinks the oil pressure has hit the low threshold.

We really need him to read the oil pressure data from the ECU and compare to the mechanical gauge.

_________________
http://www.Colorado4Wheel.com
"Its not about what you can DO with your Jeep, its about where you can GO with your Jeep."
Knowledgeable - But Caustic

What kind of tool is required for that?
TorquePro does not display oil pressure.

I always believed that the oil pressure sensor was nothing more than a switch. Once pressure is achieved, switch closes and light turns off.

_________________
U.S. Army Retired

I will get a new sending unit tomorrow. Is there a way to check the oil pressure through the ecu? I have a wireless obd scanner...

well i think that DRBlll tool or similar tool can read oil pressure data ,just like mentioned earlier , but i do trust mechanical gauges , and strapping them to mirrors or viper blades and going for road test will tell me what is going on with road bearings so no special tool needed just mechanical oil pressure gauge and you have one so if oil pressure stays in the specs after road test , then you are lucky and you have a electrical problem , again if you come back from road test with 20 psi idle engine HOT and no noise from bottom end , you are dealing with electrical issue .

Wow..... this morning I went and got a new sending unit and a t connector. Installed the t connector and the pressure sending unit and a manual gauge. Started the Jeep and the oil pressure light went off almost immediately. Pressure was good on the Manuel gauge. I decided to take it for a drive and had zero issues. Jeep ran like it use to.

I don’t know if it was just a coinciendence that the sensor went bad at the same time the turbo but it seems odd. I’m going to keep the manual gauge on just to keep an eye on the oil pressure.