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Which One Of These Is The Oil Pressure Sender ?

Munkyb0y

By Munkyb0y,
in Engines & Forced Induction

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Munkyb0y Grand Master

Munkyb0y

Posted
Posted (edited)

DSC05526.jpg

the big yellow one?

my standard oil pressure gauge was showing low readings yesterday morning (1 at idle - 2 when driving)

then after being parked for 30 mins, the gauge showed normal readings (2 at idle - 4 when driving)

than again a few hours later the readings were low again.

i suspect (hope) it's the standard sensor playing up.

EDIT:

i cleaned the plug terminals with contact cleaner. they were clean anyway.

the gauge is now showing kinda normal readings, just a tad low on cold start. it use to creep up to 5-6 on the stock gauge, now it goes just over 4.

at about 3000rpm, warm, its just under 4. this is a bit lower than it used to be. idle is a touch under 2, as before.

my question is, is there something that would actually cause low oil pressure (1 at idle - 2 when driving), and then recover from this?

or is this almost certainly a gauge/sender fault?

i plan on getting an aftermarket gauge, but sandwich plate etc, it's gonna take a while. i'm guessing you have to drop the oil in order to do this. no way around it?

Edited by Munkyb0y
Munkyb0y Grand Master

Munkyb0y

Posted
  • Author
Posted

i cleaned the plug terminals with contact cleaner. they were clean anyway.

the gauge is now showing kinda normal readings, just a tad low on cold start. it use to creep up to 5-6 on the stock gauge, now it goes just over 4.

at about 3000rpm, warm, its just under 4. this is a bit lower than it used to be. idle is a touch under 2, as before.

my question is, is there something that would actually cause low oil pressure (1 at idle - 2 when driving), and then recover from this?

or is this almost certainly a gauge/sender fault?

i plan on getting an aftermarket gauge, but sandwich plate etc, it's gonna take a while. i'm guessing you have to drop the oil in order to do this. no way around it?

PM-R33 Grand Master

PM-R33

Posted
Posted (edited)

Hmm interesting, i used to get similar things with really low oil pressure. It would only do it now and then, like once a week. I would be sitting at a traffic light or something and then suddenly my oil pressure would go down to like zero and id be like ;) but there were no signs of any problems so i never thought much of it. Hmmm might check my sender aswell.

Where is the actual sender located? Im looking at that pic and have no idea where that is??? (Below the intake runners??)

Edited by PM-R33
blind_elk Grand Master

blind_elk

Posted
Posted
my question is, is there something that would actually cause low oil pressure (1 at idle - 2 when driving), and then recover from this?
How much oil is in the sump? How old is the oil? What grade is the oil?
Munkyb0y Grand Master

Munkyb0y

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How much oil is in the sump? How old is the oil? What grade is the oil?

less than 1000kms old. 7.5w30 genuine nissan semi-synth. dipstick shows full. car has never used oil between changes.

sav man Grand Master

sav man

Posted
Posted

the stock sensors are renowned for being crap (in the GT-R anyway), mine goes to 0 sometimes (freaked me out the first time). But all i do now is flick the engine off and on, and the gauge works again. I'm gunna get a quality aftermarket gauge, as i don't trust mine as far as i can kick it.

sxc33 Rising Star

sxc33

Posted
Posted

I am in the same boat. One second it sits normal, then it drops to 0. Scared me to death eh.

How difficult is it to get to that oil pressure sender unit in the pic? I can picture it, but i have hands bigger than dinner plates, so it's super hard for me to even get my hands around the oil filter.

TurboX Mentor

TurboX

Posted
Posted

Yeah well you could all be like me..... thought yeah its just the sender , they are all crap and a common problem.

BUT, on rebuilding the motor from continuing driving when the screws had come out of the back of the oil pump and impossible to see,

it was REALLY the oil pressure being almost non existent that caused the big ends to start knocking and burning!

I certainly would not wish that on anyone so hope thats not your problem!

Maybe you should do what my son suggested and fit a proper mechanical Oil Pressure gauge and avoid the end disaster. :dry:

PM-R33 Grand Master

PM-R33

Posted
Posted

Can u just replace the sender or something? Its just i allready have 2 gauges in my car in a pillar, and would rather not get another gauge (oil pressure) to just chuck somewhere on the dash. If its just the sender, would a new sender fix the problem instead of getting an aftermarker oil pressure gauge?

Munkyb0y Grand Master

Munkyb0y

Posted
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Posted

you can change the sender, but you'll need a nissan or nissan compliant sender. otherwise the values it's sending wont be correct for the gauge.

just like you cant hook up an aftermarket gauge to the standard sender and expect it to work correctly.

i'm not too sure, but have read that the nissan sender costs quite a bit. defi gauge price range :D

Munkyb0y Grand Master

Munkyb0y

Posted
  • Author
Posted
my question is, is there something that would actually cause low oil pressure (1 at idle - 2 when driving), and then recover from this?

or is this almost certainly a gauge/sender fault?

i plan on getting an aftermarket gauge, but sandwich plate etc, it's gonna take a while. i'm guessing you have to drop the oil in order to do this. no way around it?

????? :)

RB30-POWER Mentor

RB30-POWER

Posted
Posted

i have a mint sender if anyone wants to make an offer on it.

it might be the sender, it might also be the dash guage.

at the end of the day unless you put a mechanical guage on it, you will not really know the pressures for sure.

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