oil pressure

[GTIR1000]

went out in the r the other day to petrol station started it up oil pressure went up to six down to four then once warm when idling at 2 then all of a sudden it stred to drop to 1 when idiling didnt think much of it took it for spin round town gave it some a few times holding boost fine no smoke nothing then it stayed the same back to normal 2. then today just took her for a run got pretty warm and agin at idiling pressure stared to drop to one even a bit below at idling. yet i took her out between the first time of it doing it and today and she was fine what could this be

 

[Fast Guy]

What pressure do you get above 3200rpm?

 

[Az]

Exactly the same as mine.

On advise here I did a oil and filter change (needed one anyway) but it still does it now, when she's warmed up.

When driving mines fine around 3-4, just when in traffic or stopped it drops below 2, sometimes 1.

I checked my oil dipstick and it full waaaaaaaay right up. Well above the full line. Not sure whether this would have anything to do with it though.

 

[Fast Guy]

Below 3200 the manual says at least 0.98bar (14psi) so 1 or 2 bar is fine, start worrying if you still have that above 3200rpm where it should be something like 3.5-4.5bar.

 

[mattygti-r]

i use silkolene oil and an uprated filter,

mine starts up on 6 goes to 4 then 2 never 1 thou

 

[geetee]

Should I worry that when cold mine is just over 8.

When fully warm and cruising at 70 - 80 mph is just under 8.

At Idle is about 5 - 6.

Using Castrol RS 10W - 60.

Probably the gauge me thinks.

Cheers
GeeTee 8)

 

[mattygti-r]

8 :shock:

 

[geetee]

tell me about it.... anything over 4K rpm.... just under 8.

I'm sure the gauge is lying, but oddly it makes me feel happy that I have so much oil pressure when everything else is going wrong around me :lol:


GeeTee

 

[Az]

Below 3200 the manual says at least 0.98bar (14psi) so 1 or 2 bar is fine, start worrying if you still have that above 3200rpm where it should be something like 3.5-4.5bar.

Ahh right thanks for the info

geetee 8) my girlfriend has just had a new headgasket in her 306XSi and the oil pressure is ALWAYS maxxed out :shock: :lol: Seems to run ok though :?

 

[turblio]

Most of Our sender units and gauges are 14 years old and they all seem to
play up mine reads 8 bar on start up sometimes runs at 5 on the motcrway sometimes at 3.75 mostly 2 at idle but the best way is to get a mechanical one plumbed in
Frank

 

[Anonymous]

had the same problem,change the sender and im sure it will be fine.......................Gaz

 

[geetee]

I don't care so much to be honest - I know what it reads now in various conditions, so I'll be able to see any drastic rise or fall which is the important thing.

Cheers
GeeTee 8)

 

[LOU ROB]

The sender units on the gtir and the 300zx are crap :x I've had to change my sender unit 3 times in 2 years.
Like Fastguy said, if the pressure is crap over 3200 revs then its compression test time :lol:

 

[GTIR1000]

i went to work in the r this morning and every thing was fine the pressure was going up with revs and was dropping to 2 at idle then at the next set of lights it dropped to below one and was not risining above two two and a half even at quite high revs but then i got to work put the turbo timer on sat in my car two secs the pressure was below one then all of a sudden shot up to just above two again at idle what is going on

 

[Fast Guy]

Like Fastguy said, if the pressure is crap over 3200 revs then its compression test time :lol:

Compression test for low oil pressure? :shock: I'd be changing the sender first, checking with a mechanical pressure gauge second, worrying 3rd (Actually that's a lie, I've just ignored it for the last 11 months )

 

[LOU ROB]

the problem gtir1000 has would be more than likely to be the pressure sender unit ( the same symptoms happened to me twice ).
They can be pricey though, £65 from nissan :shock:

 

[LOU ROB]

Compression test for low oil pressure? :shock: I'd be changing the sender first, checking with a mechanical pressure gauge second, worrying 3rd (Actually that's a lie, I've just ignored it for the last 11 months )

From my experience, i've had low oil pressure through 2 badly broken pistons.
The worst one I had was when I bottomed the car out on a back road, smacked the sump which bent the oil pick-up pipe, which caused the main bearings to die

 

[Fast Guy]

Gotcha, I'd still be tempted to check it first with a mechanical gauge to confirm low pressure or not.
If your main bearings go, you'll hear it and know you have low oil pressure

 

[GTIR1000]

i just cant understand why it is ok sometimes and not others i have been told it could be the cold weather thanks for the help i will be doing an oil change at weekend the comp test see what i find cheers again

 

[Fast Guy]

i just cant understand why it is ok sometimes and not others

Like a few of us said, it's most likely the oil pressure sender unit playing up.