That's true. I agree the pressure gauge must be somewhat inaccurate when reading zero because the oil pressure tester showed 18 psi, which should give a readout of 1.25 bar on the dash gauge. Maybe the senders aren't designed to measure much below that value, so it just drops to zero. Just speculation though. Both pressure senders I have tried (original one and new replacements) show the same thing. The old sender is flaky though. The needle bobs about intermittently.If there is no engine noise when showing zero oil pressure you would have to think just a faulty reading?
If the pressure was really zero it would be game over pretty quickly.
I don't think the lubrication system on these cars has a pressure relief valve. It's built into the dry sump oil filter I believe. Oil filter was replaced with recent oil change.Sticky pressure relief valve? I imagine oil filter has been changed, some have built in relief too for when very clogged. Good luck!
Did you have the symptoms before the oil and filter change? (apologies if you have already posted this information) If not, then faulty filter?I don't think the lubrication system on these cars has a pressure relief valve. It's built into the dry sump oil filter I believe. Oil filter was replaced with recent oil change.
Did you have the symptoms before the oil and filter change? (apologies if you have already posted this information) If not, then faulty filter?
Just re-read your first post and you've had issues for a while. It still sounds like something stuck/blocked to me. You don't go from having oil pressure to not having oil pressure and then back again if the pump is knackered
That's true. I agree the pressure gauge must be somewhat inaccurate when reading zero because the oil pressure tester showed 18 psi, which should give a readout of 1.25 bar on the dash gauge. Maybe the senders aren't designed to measure much below that value, so it just drops to zero.
A VERY cheap and cheerful design, it's almost as if they designed in failure! As ifThe meter is measuring the resistance of the sender, the oil pressure moves a wiper across a variable resistance board. The sender earths through the engine block and so the gauge is measuring the resistance between the earth and the contact on the gauge.
Possible causes if you are seeing variation with electrical load is the engine earth strap, wire to the gauge, or a bad earth from the gauge to the body (if this is shared with the heater fan then this sounds likely).
If the gauge ticks (jumps from one reading to another) then the wiper in the sender is sticking and needs replacing.
Pretty grim eh?A VERY cheap and cheerful design, it's almost as if they designed in failure! As if
To be fair the above design pressure sender is/was standard across the industry and found in millions of cars.