R34 Oil Pressure Low

[Ericjayrol]

Hey

Lately my oil pressure gauge has been getting pretty low from time to time and other times it will be normal and fine, sometimes it even drops down so low and then goes back to normal during a 1 hour trip.

I have a photo of the pressure gauge at its lowest which was only 2 days ago, and since it hasn't had the issue but it does come and go and im not sure if I should be worried or not, any opinions or suggestions would be helpful.

[The Bogan]

Mate, my uneducated assumption would conclude that is not a good thing, oil level, condition, filter ?

Stay off boost till you find out what is wrong as you may destroy your motor.

[Ericjayrol]

The oil level is fine and the filter is almost new, having been serviced only 500km ago

Its a non turbo, so don't have to worry about boost

[snozzle]

common problem for the fuel pressure sender/switch to play up, replace that and you should find that your reading will return to what it should be.

its located near the oil filter

ive circled the oil pressure sender in red in the pic below

if that fails then it looks like ur oil pump is quite worn..

[Ericjayrol]

Thanks snozzle, I'll have my mechanic take a look at that and see if thats the problem.

[Galois]

the stock oil and temp sensors are notoriously inaccurate too so don't freak out, all might be fine. well worth finding the problem tho

[POWR34]

Hey

Lately my oil pressure gauge has been getting pretty low from time to time and other times it will be normal and fine, sometimes it even drops down so low and then goes back to normal during a 1 hour trip.

I have a photo of the pressure gauge at its lowest which was only 2 days ago, and since it hasn't had the issue but it does come and go and im not sure if I should be worried or not, any opinions or suggestions would be helpful.

Have you checked your oil lately..??

not milky..???

[POWR34]

standard gauges are very unreliable.... dont always trust them..!!

[Ericjayrol]

I checked the oil and it was at perfect level and not milky at all, looks exactly like straight out of the bottle, still has that nice golden transparency.

[Moodles2]

At idle revs when the oil is completely up to temp, 1kg/cm is about right for oil pressure.

[realor]

for what it's worth my car sits around that level at idle - dunno if that's good or bad but it goes up when accelerating

[Wacky Dee]

I have this exact same problem with my R34 GTT ... I reckon its a faulty sender unit. I asked Nissan how much for a new one and from memory it was close to $200 yikes

but it's been bugging me for so long now I might just try get one from the wreckers just to see if its the actual sender unit (provided I don't get another lemon from the wreckers)

How hard is it to remove/replace one of these sender units through the engine bay ? would be a real pain in the bum hey ? the whole thing that you circled in red has to be unscrewed yes ? would oil leak out when you unscrew it?

[Wacky Dee]

speaking of which .. can the original sender unit be cleaned to make it read correctly or is it gonesky once it starts playing up?

[ausreptiles]

What did te issue end up being? My 34 gtt runs the same when idle. Is it normal?

[Hanaldo]

My aftermarket gauge reads just above 20psi at idle. Which is about 1-1.5kg/cm^2. So yes, I'd say that's about normal.

[Galois]

^There you go OP.

Still worth replacing your sender though IMO.

Edited June 14, 2011 by Galois

[joker's r34]

Hey

my r34 GT has the same thing, when its cold it sits about 5 ish and when its warm and just idle it will sit around 1 ish but will go up when you start to drive ??

freaked me out as well when i first seen it , so is this anything to worry about ? thanks guyz

[Run-It-Hard]

That's normal. The hotter the engine is, the more oil will thin out resulting in less oil pressure. So on a cold start oil pressure will be very high. On operating temp it'll probably be around a quater of what the pressure is on cold start.