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Old 07-20-2016, 08:39 PM   #1
WhatsASubie
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Default Low oil pressure help! on a 2013 wrx

Long story short engine spun a rod bearing within the first year i got my 2013 wrx. After that, the subaru dealership replaced it under warranty(not exactly sure if they did the whole short block or something). I had an oil pressure gauge installed on the car (front galley, with a remote mounting thing for less vibration). It reads scary low. After the oil is up to operating temp, at idle the oil pressure would be 4-8psi according to the gauge (using 5w30, ~210F). I asked my friends with the same year car and they are seeing ~20psi at idle (they didn't spin a rod bearing).

There is no oil residue anywhere on the sensor or where the galley is so im confident there is no leaks. I checked all the wiring and even borrowed a friends gauge to check if its reading right, even replaced the sensor. What could cause my idle oil pressure to be so low? I also have killer b pickup, baffle, and pan.

When i rev it it would go back up, about 50-70 psi driving.

Could it be my oil pump? If so, should i upgrade to a 11mm or even the orbit one?

Thank you in advance, your help its greatly appreciated.
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Last edited by WhatsASubie; 07-20-2016 at 08:47 PM.
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Old 07-20-2016, 09:33 PM   #2
shakur45
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You check the oil pickup tube?
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Old 07-20-2016, 10:30 PM   #3
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First thing I'd do is replace the sender with a mechanical oil pressure gauge. They're dead accurate and affected by nothing. I'd duct tape it to the windshield so I can see it (this is obviously temporary). See if it matches your present gauge pressures.
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Old 07-20-2016, 10:46 PM   #4
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Default Low oil pressure help! on a 2013 wrx

Quote:
Originally Posted by shakur45 View Post
You check the oil pickup tube?
Killed my motor. It's real kids
*edit: scratch that. OP said he has a killa B - they're pretty solid. Still leaving pic though... Warning - graphic content.https://i.imgur.com/4woF9mH.jpg

Last edited by Subie_; 07-20-2016 at 10:53 PM.
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Old 07-20-2016, 11:27 PM   #5
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Quote:
Originally Posted by shakur45 View Post
You check the oil pickup tube?
Like i said i did the killer b upgrade already.. please read the whole thing.

Quote:
Originally Posted by Jack View Post
First thing I'd do is replace the sender with a mechanical oil pressure gauge. They're dead accurate and affected by nothing. I'd duct tape it to the windshield so I can see it (this is obviously temporary). See if it matches your present gauge pressures.
I will try this soon.. if the readings are still low what might be the issue?

Last edited by WhatsASubie; 07-21-2016 at 04:43 AM.
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Old 07-22-2016, 01:56 AM   #6
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Bump anyone know?
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Old 07-25-2016, 04:18 AM   #7
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so i swapped the gauge and sensors, still reads low. does that mean its the oil pump?
Should i get a 12mm pump or a 11mm? Some people say it could be that when the engine was rebuilt the tolerance from the dealer is different, I dont know what to believe. any input? Thanks again.

Last edited by WhatsASubie; 07-25-2016 at 04:11 PM.
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Old 07-28-2016, 12:08 AM   #8
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Quote:
Originally Posted by WhatsASubie View Post
so i swapped the gauge and sensors, still reads low. does that mean its the oil pump?
Should i get a 12mm pump or a 11mm? Some people say it could be that when the engine was rebuilt the tolerance from the dealer is different, I dont know what to believe. any input? Thanks again.

Missing an oil seal maybe? Like the pickup oring? Not really sure man... I'd check over in the built motor section.
As far as the pump is concerned, I've read the 12mm is unnecessary and can potentially result in cavitation, however this is likely an opinion.
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Old 07-28-2016, 04:33 PM   #9
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Quote:
Originally Posted by WhatsASubie View Post
After that, the subaru dealership replaced it under warranty(not exactly sure if they did the whole short block or something).
First thing to do is find a receipt showing what they did, you should have gotten a record. If they replaced the short block the tolerances should be factory spec. If they for some reason rebuilt it and used looser tolerances then maybe yes that would explain lower pressure but really....that makes it out of spec and should be brought up to the dealer.

FSM spec is 14psi or more at 600RPM

Last edited by darkstarmoto; 07-28-2016 at 05:20 PM. Reason: added FSM info
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Old 07-28-2016, 06:15 PM   #10
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12mm is a horrible idea, 11mm not good either on a stock block single AVCS. You'll just be bypassing & heating most of your oil...

I'd definately be making a trip to the dealer.
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Old 07-28-2016, 06:58 PM   #11
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Was the pump cleaned or replaced? Was the stock oil cooler replaced? If they rebuilt it did they clean the block correctly?

Are the killer b parts new? And who installed them?

I am going with the oring on the killer b pick up not installed if the above was done correctly.
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Old 07-28-2016, 07:03 PM   #12
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No oil cooler on +08 wrx, ej255
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Old 08-02-2016, 04:01 PM   #13
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The killer b parts were installed by me, and are new. I have the oil pressure issue before i did the killer b kit. I thought it might be the pickup tube so i went ahead and did the entire thing. When i removed the oil pan, the pick up tube seemed fine. I do remember putting the 2 oring on the pickup and the spacer they provided.

Last edited by WhatsASubie; 08-02-2016 at 05:43 PM.
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Old 08-15-2016, 05:39 PM   #14
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bump still suck
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Old 08-17-2016, 09:25 AM   #15
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Verify with a mechanical gauge. Do not drive the car!

Could be a bolt or few have loosened on the back of the oil pump, stuck bypass, etc...

Was the oil pump replaced when the engine was?
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Old 08-30-2016, 05:16 AM   #16
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Quote:
Originally Posted by KillerBMotorsport View Post
Verify with a mechanical gauge. Do not drive the car!

Could be a bolt or few have loosened on the back of the oil pump, stuck bypass, etc...

Was the oil pump replaced when the engine was?
Thanks for the reply i doubt they did.
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Old 08-30-2016, 10:03 PM   #17
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Changed he pump still have weird low idle pressure.

Last edited by WhatsASubie; 09-01-2016 at 06:14 PM.
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Old 09-01-2016, 06:14 PM   #18
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Bump any one have some insight?
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Old 09-01-2016, 08:54 PM   #19
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Oil pressure is related to pump output and 'leaks' in the engine. If the clearances in the bearings is too great...low oil pressure. Or if the pump isn't putting out sufficient pressure...low pressure.

Some debris could have damaged the internals on the refreshed engine.

Many ideas...unfortunately none are probably helpful.
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Old 09-01-2016, 09:44 PM   #20
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If you gone to the point where you have changed oil pump and no differences. Doesn't look good. What was oil pressure before you did the pickup? Is it possible that the o-ring isn't seating properly? I've done the killerb pickup on my car before and i know its almost idiot proof to get it wrong. But who knows? It's the only other thing you've done on your car that can cause this.

Or could it just mean you have large clearances. If this is the case, you can try thicker oil? But if you have bad bearings you could damage your motor further. Some might say rebuild time. Personally, I like to take my chances especially if your motor is running perfectly fine but thats up to you.

Might also be worth dropping oil into a clean pan and see how that looks? Or even take off your pan and see if there's any shavings.
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Old 09-02-2016, 07:46 AM   #21
WhatsASubie
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If my bearing were damaged/ bigger tolerance or if I somehow did the pickup wrong.. wouldn't I have low oil pressure across the board?( if not worse when driving) This is only happening at idle. Which is driving me nuts..
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Old 09-02-2016, 10:22 AM   #22
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I'm surprised there was no change after tightening down the pump back plate bolts. Seal from pump to block, seal at the pickup, between block halves, large clearances, large turbo restrictor, etc... there's only so many things it could be.

When did the change occur? Where is the location of the pressure sensor? Verified with mechanical gauge?
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Old 09-09-2016, 08:41 PM   #23
WhatsASubie
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Quote:
Originally Posted by KillerBMotorsport View Post
I'm surprised there was no change after tightening down the pump back plate bolts. Seal from pump to block, seal at the pickup, between block halves, large clearances, large turbo restrictor, etc... there's only so many things it could be.

When did the change occur? Where is the location of the pressure sensor? Verified with mechanical gauge?
Well i mean the motor was rebuild by the dealership due to rod bearing failure. Other than that theres no internal mods or turbo mods. A lot of people sat that the 2 seals to the pickup or the oil pump.. I replaced the pump with a brand new one and yes i replaced that o ring seal that goes in between the pump and the block.

Hell i spend today to take off the oil pan cause i couldnt think of anything else and since its so long ago.. doesnt hurt to double check if i have the seals in.. everything was tight as a whistle and both the seals were in there.



I even bought another gauge with a new sensor.. same thing.

I have yet to use a manual gauge tho..
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Old 09-11-2016, 04:48 PM   #24
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My fist thought was try a thicker oil. But you have new bearings and the problem is still there. I'd still try it. Maybe the in line banjo bolt filters are clogged. Do the 08+ have those? I know my 07 does. I through them out. I'd also be a the dealer saying what's up. Even if my warranty was up. I'd raise hell until they fixed it.

Last edited by ej2007; 09-11-2016 at 08:33 PM.
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Old 09-12-2016, 01:17 PM   #25
WhatsASubie
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i've done everything i could think of maybe when they rebuild the shortblock they had looser tolerances i dont know.. ive never heard of a banjo bolt fitler

Last edited by WhatsASubie; 09-12-2016 at 01:46 PM.
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