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Low Oil Pressure

Kruges

By Kruges,
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Kruges Explorer

Kruges

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the oil pressure gauge in my 1994 r33 gtst droped to below one yesterday, no warning light came on however. the gauge now varies in oil pressure depending (from what i can gather) on revs. for exaple when i first noticed the oil pressure i was at a set of traffic lights and i only drove it far enough to pull over, as i drove off oil pressure picked up tp about 2/3 and droped again once i took my foot off to about 1 and jus above 0 when i pulled over. in 4th doin about 90kms/h the gauge will read 4ish and then put it in 5th or take my foot off and it slowly drops. oil level is fine as this was the first thing i checked. im going to check the sender unit this weekend and i dont plan on driving the car until this is sorted. please if you have any ideas or know of any common problems with oil pressure with the r33 let me know any help would be much apreciated.

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Amec Experienced

Amec

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the oil pressure gauge in my 1994 r33 gtst droped to below one yesterday, no warning light came on however. the gauge now varies in oil pressure depending (from what i can gather) on revs. for exaple when i first noticed the oil pressure i was at a set of traffic lights and i only drove it far enough to pull over, as i drove off oil pressure picked up tp about 2/3 and droped again once i took my foot off to about 1 and jus above 0 when i pulled over. in 4th doin about 90kms/h the gauge will read 4ish and then put it in 5th or take my foot off and it slowly drops. oil level is fine as this was the first thing i checked. im going to check the sender unit this weekend and i dont plan on driving the car until this is sorted. please if you have any ideas or know of any common problems with oil pressure with the r33 let me know any help would be much apreciated.

its normal for oil pressure to rise with the revs.

what oil pressure is it running at idle?

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msnismo Grand Master

msnismo

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^^^^^ +1

Yep don't rely on standard... well known for faulty readings....

for example... my standard one does not exceed 4 no matter what the conditions... when its hot, at idle it reads slightly off 0!

My blitz mechanical one reads between 6 and 6.5 bar on cold start (idling) .... once warm and driven for a while (ie oil is hot as) idle is 1.5 bar..... I can see the gauge move for everything... ie when the pressure relief valve opens...

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Kruges Explorer

Kruges

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its normal for oil pressure to rise with the revs.

what oil pressure is it running at idle?

it sit very close to zero once its warm at idle. i plan to keep it off the road this week until i sevice it the weekend and check the oil pressure with another gauge. that should narrow it down.

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Kruges Explorer

Kruges

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sorry for taking so long to reply, have been out of internet access. went and bought a mechanical gauge just to use to try and help work out where the problem was. according to the gauge i have perfect oil pressure and increases perfectly with revs. and on that note im currently in the process of purchasing a good quality aftermarket gauge. thanks heaps for your help.

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Amec Experienced

Amec

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Makes sense why mine is eratic. Jumps up and down. Might try another dash cluster I have.

Cheers Guys

the problem can also be caused by the oil pressure sender that screws into the motor, not just the dash.

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Kruges Explorer

Kruges

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my sender unit was below the oil filter and to the left a bit. theres a rubber boot covering the plug from it and it just unscrewes out of the block (i managed to get a spanner onto it when i was undoing it, fairly sure it was a 17mm). does anyone know if you can purchase aftermarket sender units? from what ive heard from people who replaced them with the standard one again. find that they play up again anyway.

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