No Oil Pressure ??????

The other nite my oil light turned on. After 5 mins of driving it turns off, and car seaemed back to norml, can still vtec etc... This happened for 2 days everytime from cold start.

But it had me a little worried. I thought it might just be the oil sensor stuffing up and changed it, but everytime i do a cold start the oil light comes on still. So i got an oil pressure gauge and put that into where the sensor goes, and getting a reading of Zero pressure on idle.

I know chances that oil pump has died is fairly slim, but any idea of what else it can be? What else can i do to check? I got pretty annoyed and ripped the whole engine out last nite, and will be changing the oil pump, is there any where else i should check? like for blockages or something?

Any help appreciated.

Have you got a large oil cooler? I notice that my pressure is crap on cold start cos its trying to push thru my oil cooler. Check the hoses on the oil cooler.

Also check earthing on the oil pump

If you've got an electric oil pressure guage and you can still vtec etc etc, it sounds like its a shitty wire in the loom somewhere.

I'm assuming you tapped into the wire near the ecu?? If you have you might wanna crack out the multimeter and test the oil pressure wire close to the plug on the block to make sure theres no breakage in the wire.

Good luck bro.

there's a earth on the oil pump? where is that?

And no i didn't tap into any wire. I'm doin an actual pressure test straight from the block.

Is there another outlet that you can check the pressure from?? maybe that oil passage is fully/partially blocked and when you've got cold oil it might not be able to get through.

Many things need an answer first:
y/m/m?
Mileage?
Original motor/no rebuilds?
Original oil pump?
any other mods?

Yeah i really got no idea. Was hoping some expert could shed some light on things. But i'm pretty sure there should be some sort of pressure right there even on idle.

y/m/m? - 01 ITR motor
Mileage? - 140 000ish km
Original motor/no rebuilds? - No rebuilds
Original oil pump? - Orginal
any other mods? - No internal mods.

Check the oil pump and bearings for clearance tolerances. Are there any external mods? What weight oil are you using? What is the weather like down there? I'm in the U.S. sorry!!

Yes that will be my first check as soon as i get home from work. As for external mods - I/H/E, solid mounts, lower final drive, lower temp thermo - switch and stat. Weather here is average, not super hot or super cold atm. Nothing but Geniune Honda Oil.

duy mate get a air blower and blow into your oil pressure switch to clean it out of any blockages. then retest it with the oil pressure gauge, see how that goes!

ivan is grant a trust worth mechanic? lol. If my mechanic too busy to check it out, i might just bring my whole engine down to you guys.