Crazy Oil Pressure

[defari]

so i did an oil change a few weeks ago - car has been running as normal - no problems..

then noticed today my oil pressure dropped to 0 (greddy oil pres. gauge) whilst the stock gauge still showed between 2-3... pulled over just to be sure it there wasnt oil spilling out - no leaks - disconnected the sensor/plug for the gauge - plugged it back in - turned the car on - still showing no pressure - stock gauge still shows normal pressure 2-3 - drove it down the road - felt normal - tried a little boost - 7psi no problems - 10psi no problems..

Got home - let it sit for a bit - just went down turned it on - still showing no pressure on the greddy gauge but still shows pressure on the stock gauge - unplugged the sensor / wiring - clipped it back in - now its showing maximum pressure on the greddy gauge 10kg/cm2 but still normal on the stock gauge.. No leaks, drives fine but now i can hear a slight hissing noise / leaking noise above the injectors / below the TB about midway down the engine on the drivers side. Never heard this before. I got a bit of cloth and covered the underside of the throttle body to see if it was leaking - wasnt that, the gasket was replaced a few thousand km ago so it shouldnt be that.

... Would this be more of an electrical / sensor problem? Or further problems given the hissing noise?

The only other work i did was a fuel filter but i hardly think that would effect oil pressure. The filter isnt leaking - direct replacement for what i had in there. Not sure if that has caused the hissing noise

Edited August 10, 2011 by defari

[PM-R33]

Where's the greddy gauge pressure sender mounted? As in where have you got it taking it's reading from?

[rad100]

as if you even continued to drive it with no oil pressure on the gauge...

but yeh if its in you oil cooler if you have one you could have a blockage?

do you have oil cooler? and as above where is the sensor?

[defari]

It's mounted o the sandwich plate underneath the relocated oil filter. Cooler sits on the front.

Seems to be the electrics I think. It flashes the warnin light intermittedly then goes back to normal pressure.

[tridentt150v]

It flashes the warnin light intermittedly then goes back to normal pressure.

The Greddy gauge? or standard dash?

[defari]

Greddy gauge. Stock still reads as normal. I think there might be a bad wire because the needle blips and goes crazy every now and then

[tridentt150v]

I had greddy's and they are a bugger for phantom loose connections. I ended up selling them on for some stepper motor ones.

[defari]

well ive un clipped everything and re zip tied the wires so they arent being crushed or near anything hot (was kind of being pinched beside the oil filter and the chassis) straightened it all out - hasn't shat itself all day so fingers crossed its just the wiring.