No oil pressure!! Thoughts?

So here's the backstory. Just rebuilt '09 r56 after a timing chain failure. Ran great for several weeks. About a week ago while driving on the highway, coolant light comes on first yellow, then red. Obvious overheating. Pull off after about 2 miles (I know, red means stop now but my wife and son were in the car and I'm not putting them on the shoulder of the interstate).

Tow home, fix lower rad hose and refill..... Low oil pressure at idle only so I pulled the oil pan, scraped a bunch of little plastic bits off the sump. Ran the oil through a finer wire screen to check for metal bits thinking a bearing may have spun and blocked a port or two and found nothing. Bolted it back up and no I have zero oil pressure period.....FML

Dropped pan AGAIN, pulled pump this time and disassembled. Everything looks kosher. Bolt everything back together. Still ZERO oil pressure.

Not the sensor, I can see no oil reaching the top of the motor with the valve cover off and hand cranking or cranking with the starter and coils pulled.

Anyone have some ideas besides tossing the motor? How did it go from no pressure at idle to no pressure period???

 

two things come to mind:

1- there is some sort of check valve in the oil filter housing. check it out.

2- when i had a similar issue with my N18 engine though, my friend suggested i remove the valve cover and pour the oil all over the place. and it worked.

just like when you handle the sump pump at your house,you cannot fill the bucket with water and expect the pump to start sucking. you need to sort of get the air out of the pump so it can create "vacuum" to pull the fluids.

where in NJ are you at?

 

I'm in Sparta but moving to Mendham this week so I have like 2-3 days to figure this crap out.

And I tried what you suggested with oiling the valves to no avail. Still no G.D. pressure.

 

Any luck with your quest?

 

I decided to replace the oil filter and reprogram the ECU. That took care of the code.

 

how did you reprogram the ECU? I have an 07S that keeps flashing low oil pressure but I’ve changed everything the Vanos, Vanos solenoid, non return valve, oil pressure sensor, pulled the pump out and cleaned it out and still keeps flashing. I have a new oem filter I’m waiting to put in but wanted to check the valve in the oil filter housing.

 

i usually use winkfp and ncs to program and code these modules. If the light keeps coming, you need to use a pressure gauge to make sure it's not a mechanical issue.