1.8T AWT Engine Oil pressure - Stop engine

[KPA]

Here we go again, i know that there's alot of these threads around on the internet, But i feel like i did alot of the stuff People did to fix it /-:

The engine sounds alot like a DIESEL, even tho it's a 1.8T gasoline engine.

It hasen't lost power at all, it just sounds like a diesel, and the Oil pressure turns out waaaay too low.

Oil pressure test : 0,2 Bar at 900 RPM
Oil pressure test : 1,5 Bar at 2500 RPM

It should be waaaay higher ( as i remember 2,0 bar at 900 RPM and 3,5 at 2500 RPM ) correct me if i'm wrong, can't exactly remember the DATA.

The following parts have been changed ( the most Common parts mentioned on other threads ) :

-Oil filter
-Oil 5w-40
-Oil pump
-Oil Pan
-PVR ( Pancake valve )
-PVR hoses cleaned ( Seems like it's alittle rusty? )
-Oil pressure switch ( the one at the oil filter )

The car has got Oil chance 4 times since the last 1,5 months ( Cause of different additives, trying to fix the problem )

Following additives has been used :
-Würth Oil additiv
-CRC Motor flush
-Würth gasoline additiv
-Valve cleaner additiv

Some guy told me that It could be the Oil pipes inside & outside the engine. He told me They could be rusty caused by engine NOT bring run for a long time (Just to mention, the car was standing still 1 year before i bought it)

It's hard for me to belive that the problem is the mentioned above, seems so unrealistic?


The engine fault codes are :

16712 - Knock sensor 1 - bench 1
16395 - Intake camshaft position - bench 1
17733 - Something with ignition ?
17735 - The same as above with different bench
16717 - Knock sensor 2 - Bench 2

They were all deleted after diagnosis.

The Oil sump has been cleaned 2 times now, seems fine tho.

Any clues at this point ? I'm running out of hope for this engine to run correctly again )-:

[StriktlyAudi333]

How sure are you that it's oil pressure? How intermittent is the sound? Always knocking or just at different throttle positions? I've have 6 audis come into my shop and on the first one, we (embarrassingly) misdiagnosed all of those issues with the same pressure readings with the VCDS. After having this car for a while, it ended up being the timing belt tensioner. The hydraulic pin failed and it was causing the tension roller arm to tap back and forth against the actual tensioner. It was just difficult to hear out the sound location because it gets redirected with the plastic cover over the top of it.
-just my experience
Other than that, I really doubt there would be ANY rust inside of the oil galleys unless it was sitting with the hood open and the oil cap off lol.

Good luck. Post back when you find the culprit

[KPA]

Excuse my mistakes, They are not named PVR But PRV :-)

[StriktlyAudi333]

Also try using 0w-30. That's all I use and it works awesome for me with DOHC motors.
Castrol Edge 0w-30 full synthetic European performance

[KPA]

It comes with the message " Stop engine - Oil pressure " on the board computer.

The Sound is quite Loud

- - - Updated - - -

Sound alittle like a boat engine ?
To be more precise

[StriktlyAudi333]

It's something with the timing. Make sure that's good, obviously. But it also could be the tensioner. The tensioner is ran off of oil pressure and that's another possible sound culprit. Do you have access to the car right now?

[KPA]

I'm atm using 5w-40 i also tried with 5w-30 ? /-:

[KPA]

I have no access to the car right now, But i Will later, what would you like me to check tho ?

[StriktlyAudi333]

You might just have a bad chain tensioner under the valve cover. Take a long screwdriver and use it as a stethoscope and try to pin point the noise by putting one end on the valve cover and the other to your ear. I don't know if you work on these cars or your knowledge of them, so I don't mean to step on your toes but the tensioner is under the valve cover in the back directly under the rounded off top part the is vertically facing. Check there with the screw driver

[StriktlyAudi333]

Soon enough one of the other guys like OldGuy or Diagnosticator will reply and drop knowledge diarrhea and fix your car with their super powers

[KPA]

I'd try to listen later today, Will post reply of my thoughts. But i still think it's very Strange with the display error " Oil pressure - stop engine" + the low Oil pressure with Oil pressure tester ?

To be more specific with the car, i just figured out that the Knocking sensors showed up again, and Yesterday As i did Motor flush clean. At start up afterwards the engine sounded perfect ! I had it letting run for 15 min ( CRC MOTOR FLUSH needs to be circulated around) i went outside to smoke a cig, so Happy that it finally sounded as it should. 1-2 minutes later, it sounded like hell came back to the engine )-: it made me think alot. Right as i drop In this liquid ( thin consistense ) it sounded so perfect, what the hell can this be ?

I'm so Confused.

Sorry for not mentioning it earlier

[KPA]

Other than that, I really doubt there would be ANY rust inside of the oil galleys unless it was sitting with the hood open and the oil cap off lol.

Good luck. Post back when you find the culprit

I took the pipe off all the Way from the PRV to the engine. It looks alot like rust to be honest. Could be old dry Oil, But looks alot like rust to me. 😧

[StriktlyAudi333]

I'm still not convinced of the engine so rusty it clogs ports. Try this for me..
Drain a half quart-ish of oil, and replace with a full quart of synthetic ATF. I cleaning an entire oil pan and cylinder head identically to what another mechanic did next to me. (It was an experiment to see) obviously we had unknowns of the "before" but we worked on those 2 cars a lot (returning customers for a few years and had a very small mileage difference) so we kinda had an idea of how similar they'd be. But I stand by that and do it almost every oil change. I'll let the car idle for about 20 minutes with the ATF mixed in, and then I drain it, replace the filter, and put new oil in the ATF does an incredible job of breaking down sludge and all the build up. It even cleaned the pick up screen

I'm a heavy equipment and diesel mechanic for Cat inside the CRC, and we use that shit like soap and water

[KPA]

I'm still not convinced of the engine so rusty it clogs ports. Try this for me..
Drain a half quart-ish of oil, and replace with a full quart of synthetic ATF. I cleaning an entire oil pan and cylinder head identically to what another mechanic did next to me. (It was an experiment to see) obviously we had unknowns of the "before" but we worked on those 2 cars a lot (returning customers for a few years and had a very small mileage difference) so we kinda had an idea of how similar they'd be. But I stand by that and do it almost every oil change. I'll let the car idle for about 20 minutes with the ATF mixed in, and then I drain it, replace the filter, and put new oil in the ATF does an incredible job of breaking down sludge and all the build up. It even cleaned the pick up screen

I'm a heavy equipment and diesel mechanic for Cat inside the CRC, and we use that shit like soap and water

Shouldn't CRC motor flush do the same ?
I just still don't get the Oil pressure problem )-:

Also, i do not Think it's the tensioner, or yes, it's the tensioner making the devils noise. But the tensioner need Oil to be tightened up, and now as there's no Oil pressure / enough delivery to the tensioner, it doesn't tighten up as it should ( which could be the sound )

Correct me if i'm wrong :-)

Also thank you very much for your time and effort In helping me out here, appreciated alot ! 😊

[StriktlyAudi333]

Shouldn't CRC motor flush do the same ?
I just still don't get the Oil pressure problem )-:

Also, i do not Think it's the tensioner, or yes, it's the tensioner making the devils noise. But the tensioner need Oil to be tightened up, and now as there's no Oil pressure / enough delivery to the tensioner, it doesn't tighten up as it should ( which could be the sound )

Correct me if i'm wrong :-)

Also thank you very much for your time and effort In helping me out here, appreciated alot !

From the filter housing, oil is directed back into the block through a 5mm galley into the cylinder head where the camshaft journals, lifters, camshaft adjuster are fed. I think if it's clogged, it'd be in that area. I'm gunna think a little more

[StriktlyAudi333]

Oh,
And yes you're right with all of what you said and I was just trying to verify that it really is a pressure issue by locating the sound. And you are welcome it's no problem at all. I'm in the middle of rebuilding mine so I've got most of it opened up but I'm glad I could help

[KPA]

Oh,
And yes you're right with all of what you said and I was just trying to verify that it really is a pressure issue by locating the sound. And you are welcome it's no problem at all. I'm in the middle of rebuilding mine so I've got most of it opened up but I'm glad I could help

I'm gonna wait to see if some brainyak is gonna show up and fix my problem with simple words, this seems like a nightmare. Maybe it's just the waiting on simple answer i need :-) if you get any clue about it, keep me updated !

Is there a filter of some sort inside the engine, that could me stuffed out with dirt ? Do you know that 😊

[StriktlyAudi333]

No however there are machine made 90 degree turns the oil has to pass through so if there's ANYTHING jammed inside those, that'll disrupt the flow.
However I just though of something...
If the flow is being restricted, that would increase oil pressure, not decrease it. What are you VAG COM results again?

[KPA]

No however there are machine made 90 degree turns the oil has to pass through so if there's ANYTHING jammed inside those, that'll disrupt the flow.
However I just though of something...
If the flow is being restricted, that would increase oil pressure, not decrease it. What are you VAG COM results again?

- Knock sensor 1 - bench 1
16395 - Intake camshaft position - bench 1
17733 - Something with ignition ?
17735 - The same as above with different bench
16717 - Knock sensor 2 - Bench 2

[StriktlyAudi333]

It's gunna come down to doing a complete block flush I don't think it's rust but it may be sludge build up in the galleys

[KPA]

Anybody Having a clue ??

[AudiVAG]

Hi, did you find out that what was the reason for low oil pressure in your AWT engine?? I found this topic trying to find help with my AWT with similar low oil pressure problems..