Low oil pressure at idle???
#1
New Member
Thread Starter
Low oil pressure at idle???
Just picked up a 2008 350z with the vq35hr and it seems to pull very hard and runs good. But this is scaring me.
My idle oil pressure once it warms up is at this :
Now I am pretty retarded but I would say that is at like what. 8psi?
The oil pressure seems fine when driving. About 45 at 2500 rpm. Gets up past 90 too. I haven't opened the car up but I would guess it would have no issues hitting the 120 or over. So it seems fine once driving. But the idle pressure just seems bad to me.
Also my actual rpms are idling around 500 or so. Turn air on it kicks up to about 700 and the oil pressure does go up a little. But not very much more than that.
The following is with the air on blast
Going to throw a new filter and change the oil tonight and I will report back. I pray I don't have any serious problems on my hands here.
My idle oil pressure once it warms up is at this :
Now I am pretty retarded but I would say that is at like what. 8psi?
The oil pressure seems fine when driving. About 45 at 2500 rpm. Gets up past 90 too. I haven't opened the car up but I would guess it would have no issues hitting the 120 or over. So it seems fine once driving. But the idle pressure just seems bad to me.
Also my actual rpms are idling around 500 or so. Turn air on it kicks up to about 700 and the oil pressure does go up a little. But not very much more than that.
The following is with the air on blast
Going to throw a new filter and change the oil tonight and I will report back. I pray I don't have any serious problems on my hands here.
Last edited by Xrabbix; 02-09-2016 at 09:42 AM.
#2
Registered User
iTrader: (15)
The pressure with a/c on is correct (15 psi), as the idle speed is also in the correct range. The 500 rpm idle speed is too low, and will cause the pressure to also be too low.
Mobil 1 0w40 with their M1-110 filter is a good combination and will help keep your pressure within range.
Mobil 1 0w40 with their M1-110 filter is a good combination and will help keep your pressure within range.
#4
New Member
Thread Starter
The pressure with a/c on is correct (15 psi), as the idle speed is also in the correct range. The 500 rpm idle speed is too low, and will cause the pressure to also be too low.
Mobil 1 0w40 with their M1-110 filter is a good combination and will help keep your pressure within range.
Mobil 1 0w40 with their M1-110 filter is a good combination and will help keep your pressure within range.
So I should have nissan increase my idle? Or can I do it myself?
#5
New Member
My DE was around that and I never had an issue.
#6
If you want to correctly verify the oil pressure you will need to measure it with an actual gauge. The built in gauge is not known for being accurate.
As a side note the HR can have issues with internal oil gaskets that will reduce oil pressure but I haven't heard of problems with 350Z just infinities.
You can reset the idle your self by doing an idle air relearn but it will probably take you a few tries to get it to work.
Last edited by rancor; 02-09-2016 at 10:35 AM.
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#16
New Member
Thread Starter
Doing the idle relearn sometime today. Will that correct my idle alone ? What actually causes it to lose the original idle ?
Thanks
#20
Registered User
Agreed, my oil pressure looked the same for awhile and my oil pressure light would actually come on at stop lights if my A/C wasn't on (and yes pressure was normal during any sort of acceleration or steady cruise), I did exactly what you did (and other things because my car was all sorts of goofed up), switched to heavier oil and the pressure will come back up but that fix is temporary. Sounds like those gaskets are partially blown just like mine were, I don't think it will cause any immediate problems, but unfortunately, you'll probably have to get those gaskets replaced at some point with the updated ones that are metal. Take it or leave it, just want to help.
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