Jump to content
SAU Community

Oil Pressure Low (rb25)

SkyHi_33

By SkyHi_33,
in Engines & Forced Induction

 Share

Recommended Posts

SkyHi_33 Mentor

SkyHi_33

Posted
Posted

Hi guys,

Just recently bought a s1 r33 gtst, when i got it the standard oil gauge was reading 2-3 kg oil on idle, just after a drive tonight the car started trying to stall after the engine is revved up past 2k, it goes down normal but continues to almost stalling than bumps up to idle.

I found that a vacuum line was leaking on the manifold and did a quick insualtion tape job on it just to get home (close by). On the way home the oil pressure was reading around 1 kg when cruising at 60 with the leak still there.

Any ideas? Would a vacuum leak cause low oil pressure readings?

What should the oil pressure be at idle, 60km cruising, full power?

The engine runs all smooth while driving, turbo spools normal (didn't wanna boost coz of oil press reading), no noises etc...

The car is automatic (sadly) if that makes any difference?

heeeeelllpppp

Heres a pic of the leaking vac line:

vacline.jpg

Link to comment
https://www.sau.com.au/forums/topic/243785-oil-pressure-low-rb25/
Share on other sites
SkyHi_33 Mentor

SkyHi_33

Posted
  • Author
Posted

just to add,

when revved up to around 3-4,000 rpm the oil gauge reads just over 4 kg per cm sq..

i have been informed that these factory units are quite unreliable, but is there any other way of knowing apart from buying a decent aftermarket one n hooking it up?

SkyHi_33 Mentor

SkyHi_33

Posted
  • Author
Posted (edited)

stalling issue sorted, it was the bov, the adjustment was way off and the piston inside stayed open. fixed the vac line too.

engine seems to run fine, no smoke, oil still honey colored and plenty of, however I've been playing around with the oil pressure sensor n gauge but got no results.

when on cold start the oil pressure bumps up to around 5 kg per cm sq. however when warmed up and driving it still reads about 1, on boost it goes up to 2-3 and stays like that up to redline. normal? or needs attention?

Edited by tx3_90
adamsrotor Enthusiast

adamsrotor

Posted
Posted

i would say its normal mate, ive seen a few of these read very low when they get to operating temp. mine used to fluxuate up and down all the time, very unreliable. if you wanted to be certain then get your hands on a known good test gauge, pull out the o/p switch and screw the line in and jus feed line through your window go for a drive and watch the gauge, only way to be sure, cheers.

Bliksem Veteran

Bliksem

Posted
Posted

The oil pressure reading will vary slightly depending what grade your using. 2-3kg sounds normal to me though at idle. If your worried fit another oil pressure guage. When your oil pressure warning light comes on you know your starting to run dangerously low

SkyHi_33 Mentor

SkyHi_33

Posted
  • Author
Posted

Great stuff guys!

Thanks a lot, I've been looking around the place for a decent oil press gauge but haven't decided on anything. Should be next thing after full service n dyno tune.

cheers!

  • 1 year later...
tridentt150v Grand Master

tridentt150v

Posted
Posted

two years ago......................stand back stand back>>>thread revival, bring me the defibrillator!!

Std gauges will do all sorts of weird stuff. Mine stopped working for over a fortnight and then started again and hasn't missed a beat since. If you want an aftermarket gauge, just about any electronic gauge will work OK these days.

  • 3 weeks later...
rabs_33gtst Collaborator

rabs_33gtst

Posted
Posted

Yeah i have the exact same issue with mine....car runs fine, idols at about 700-800rpm. When i put the car into drive and take off (driving out of the garage) it feels very very .....laggy....like it is dragging ass just to get moving, then for example when it gets to 2000rpm and i back off to stop and turn out of the drive way it either dies or drops to about 200rpm then back up to idle rpm. Oil pressure is at about 2-3kg (had dropped below 1kg yesterday for some reason??) Have adjusted the BOV with no results, Cleaned AAC valve and tweaked the idol from 500/600 to 800rpm (from DIY on here) with no result and cleaned throttle body with no result. Looks like the gasket around the plenum is leaking so im going to change that too to ensure there is no vacum leak (i have tried to check every vacum line etc in the engine bay) in this area aswell. Would just like to know what other problems i might be overlooking in an attempt to fix the prob myself before taking it to a mechanic lol........

Cheers

MBS206 Grand Master

MBS206

Posted
Posted
Yeah i have the exact same issue with mine....car runs fine, idols at about 700-800rpm. When i put the car into drive and take off (driving out of the garage) it feels very very .....laggy....like it is dragging ass just to get moving, then for example when it gets to 2000rpm and i back off to stop and turn out of the drive way it either dies or drops to about 200rpm then back up to idle rpm. Oil pressure is at about 2-3kg (had dropped below 1kg yesterday for some reason??) Have adjusted the BOV with no results, Cleaned AAC valve and tweaked the idol from 500/600 to 800rpm (from DIY on here) with no result and cleaned throttle body with no result. Looks like the gasket around the plenum is leaking so im going to change that too to ensure there is no vacum leak (i have tried to check every vacum line etc in the engine bay) in this area aswell. Would just like to know what other problems i might be overlooking in an attempt to fix the prob myself before taking it to a mechanic lol........

Cheers

The air flow meter normally causes said problem...

Might be easier to do a search on this issue... :D Covered extravagently...

rabs_33gtst Collaborator

rabs_33gtst

Posted
Posted

Yeah i know cause i have tried to read as many as i can to gauge what is happening lol...changed A/F meter with no result (although their is no way of telling exactly wether or not the one i replaced it with is any good either :(...wondering if it could be oil pump (for low oil pressure), plenum still (changing it today), fuel pump screwed or needing a better earth (my economy has gone to shit), the a/c compressor is worn(?), TPS gone (?), ACC gone(?), ECU (playing up?) Power steering pump gone (?) A/T starting to go (not holding rev's in drive ?)......

I know their are topic for several issuses and i know i sound like a noob, but would just like to know anything else that could have an effect so i can make a list and check them off cheapest to most expensive lol

I have gone over all the electrical plugs and give them a hit with contact cleaner, checked all hose and piping connections, checked intercooler piping to turbo and their is no oil inside, opened the radiator cap and started the car to see if their is any bubbling (head gasket check). Changed the vacume line setup for BOV and Boost T with no result, serviced the car etc...

rabs_33gtst Collaborator

rabs_33gtst

Posted
Posted

Did the diagnostic check in the transmission and found out that my tps and shift solenoid b are goners....not sure if that explains the low oil pressure, but if i have shorted them out by screwing around with my stereo, something else could be rooted too...put on a 3rd AFM (which i know def works) and i didnt notice any difference with the oil pressure guage....

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • PranK
      How to attach wing for moulding into the body

      By PranK · Posted

      Thank you!
    • Matvei27
      WTB noltec r32 front upper (camber) arms

      By Matvei27 · Posted

      Bump 
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      The cam I am actually putting in (a few posts up) is actually smaller than my current one. At least duration/overlap wise. All the chop stuff I hear just sounds like an engine running badly, because it is. I then envision driving it around in 1st gear and being massively sad about it bucking to the beat of said chop. There is an idle video of someone with a similar cam floating around the internet, but mine is a custom cam (so is his) so it'll never be the same, plus the fact exhausts are entirely different. What I want to do is put some bullet mufflers/race mufflers in to replace a couple sections straight pipes that currently replace the two extra cats that I don't need. But this is even further down the line!
    • MBS206
      Shoota's R33 GT-R RB30/26

      By MBS206 · Posted

      I can tell you now, when the bracket that the little hydraulic ram attaches to snaps, with a subframe, and V8 from an AMG C63 on it, it sounds like someone letting shotgun off right beside you. It leaves your ears ringing, and a huge thankfulness that you never ever put a body part under something heavy that's only supported by a hydraulic lift...
    • Neostead2000
      Water leaking into the rear trunk

      By Neostead2000 · Posted

      Still not a guarantee fix. I used a high quality butyl-mastiq (the black goo that's not really silicone nor polyurethane, same stuff they use from the factory that just spreads out like melty cheese), and I still get lots of water on both sides of the trunk when raining or washing the car. I also suspect the factory spoiler rubber gasket might not be sealing well, so I'm thinking of adding a thin layer of grey silicone around the bolt holes on both sides and see if that's where it also leaks from. The biggest issue is that these cars don't come with a drain hole on each side like other coupes and hatchbacks.
×
×
  • Create New...