Oil Pressure Problem....? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

nino_brown · 19th July 2008, 06:37 PM

Hey,

When i start the car the oil light comes on, usually it would go out after a few seconds, but it seems to stay on for a bit longer now, and doesnt go off till i start driving for about 20-30 seconds.

During the time when the light is on, i get no oil pressure readings from the nissan dash gauge OR my own gauge which is wired to a sandwich plate between the block and filter.

Its as if I have no oil pressure until I acutally move the car. If i leave it at idle after start up the light just stays on and no pressure readings at all.

Also, once the readings come back (on both gauges) they appear fine. Car drives normally and no funny noises...as yet

Its an RB25DET btw,

Could it be the oil pump on the way out?
Its odd for both gauges to be doing the same when there are independant of each other. Also ive just changed the oil and filter this morning, and its still doing it (Silkolene Pro S as always).

Any ideas guys?

Ian C · 20th July 2008, 09:32 AM

1. Your secondary oil pressure monitor, is it electronic or mechanical?
2. What about the other two gauges on the dash, do they behave normally in this first 20-30 seconds?
3. What RPM does your car idle at?

Ian

nino_brown · 20th July 2008, 12:36 PM

Ian,

The other gauge is mechanical, all the other gauges on the dash work fine. Car idles around 1100ish on cold start.

Appears it may be a sticky pressure relief valve in the oil pump, doupt its anything electrical

Ian C · 20th July 2008, 01:55 PM

is the relief valve 'sprung open' or 'sprung closed'?

nino_brown · 20th July 2008, 02:22 PM

Not sure to be honest, but its been suggest that is the problem.

I assume it would be closed, then after a few seconds of driving it opens and allows pressure to build(?)

19th July 2008, 06:37 PM	#1 (permalink)
nino_brown GTR Register Member Join Date: Mar 2006 Location: Glasgow Posts: 87	Oil Pressure Problem....? Hey, When i start the car the oil light comes on, usually it would go out after a few seconds, but it seems to stay on for a bit longer now, and doesnt go off till i start driving for about 20-30 seconds. During the time when the light is on, i get no oil pressure readings from the nissan dash gauge OR my own gauge which is wired to a sandwich plate between the block and filter. Its as if I have no oil pressure until I acutally move the car. If i leave it at idle after start up the light just stays on and no pressure readings at all. Also, once the readings come back (on both gauges) they appear fine. Car drives normally and no funny noises...as yet Its an RB25DET btw, Could it be the oil pump on the way out? Its odd for both gauges to be doing the same when there are independant of each other. Also ive just changed the oil and filter this morning, and its still doing it (Silkolene Pro S as always). Any ideas guys? __________________ *"It's better to burn out than to fade away."* Dentist Mapped

20th July 2008, 09:32 AM	#2 (permalink)
Ian C GTROC Member Join Date: Jun 2003 Location: Buckingham Posts: 1,152	1. Your secondary oil pressure monitor, is it electronic or mechanical? 2. What about the other two gauges on the dash, do they behave normally in this first 20-30 seconds? 3. What RPM does your car idle at? Ian __________________ Winter rebuild complete - Click here to see the 2008 look

20th July 2008, 12:36 PM	#3 (permalink)
nino_brown GTR Register Member Join Date: Mar 2006 Location: Glasgow Posts: 87	Ian, The other gauge is mechanical, all the other gauges on the dash work fine. Car idles around 1100ish on cold start. Appears it may be a sticky pressure relief valve in the oil pump, doupt its anything electrical __________________ *"It's better to burn out than to fade away."* Dentist Mapped

20th July 2008, 01:55 PM	#4 (permalink)
Ian C GTROC Member Join Date: Jun 2003 Location: Buckingham Posts: 1,152	is the relief valve 'sprung open' or 'sprung closed'? __________________ Winter rebuild complete - Click here to see the 2008 look

20th July 2008, 02:22 PM	#5 (permalink)
nino_brown GTR Register Member Join Date: Mar 2006 Location: Glasgow Posts: 87	Not sure to be honest, but its been suggest that is the problem. I assume it would be closed, then after a few seconds of driving it opens and allows pressure to build(?) __________________ *"It's better to burn out than to fade away."* Dentist Mapped

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