oil pressure help/questions..

[jason61c]

The first time I let my car get properly warm and let the oil temp get up it flashed low oil pressure a couple of times at tickover. Tonight when running in the garage, I gave the car a rev and the low oil pressure light came on again when the rev's dropped.

I switched the car off, then with the fuel pump turned off I turned the car over, oil pressure when straight back up. When the car was started again the oil pressure was fine at tickover and when revving.

I've a new oil pump/sump/oil cooler/oil cooler hoses on the engine so I take it that i've got a couple of little air locks that are slowly clearing themselves?

If I'm wrong what could be the issue? Or how can I speed up the above?

Its a kit car the engine is in(e36 m3 engine) and the oil pressure is monitored on a stack dash where I can view the actual pressure in PSI. Sensors etc are all functioning correctly.

[Busa_Rush]

Have you got the sensor on a flexible mount ? I had an oil pressure sender some years ago which didn't like being screwed into the engine in place of a gallery plug but worked fine on the end of 6" of -3 hose where the vibration was much lower. If you've done this you might need to loosen the sender to allow the air out before you get consistent readings.

[sparkybean]

Check your dash is telling the truth, get a pressure guage on the engine for a while just to check. Also,try checking all the electrical connections from the sensor to the dash, certain engine speeds/loads could give a false impression of low oil pressure.

[Steve_D]

What pressure do you have your dash warning alarm set at?
You say the light comes on but you could have the alarm set too high.

Steve

[jason61c]

Its a solid state sensor so vibration doesn't affect it(apparently)! I've tested it with a manual pressure tester and its spot on. I've set the light to come on at 6.7psi which is where the original one would have. Its been totally fine for the past 6 months, Its just started since it had its first road test

I'm guessing that because I fitted a new cooler and lines that there was an air pocket that's slowly bleeding itself out.

[tristancliffe]

Sadly, solid state sensors can still be damaged/killed by vibration and should be isolated from vibration as much as is sensible.