What should the oil pressure be when idling?
When idling, the oil pressure will be lower, typically 40-50psi once warmed up, so it won’t be capped, but as soon as you dab the throttle, expect it to go to 70psi and stay there.
What should the pressure be on an oil pump?
Put another way, your oil pump should be capable of providing pressure well in excess of 70psi once above idle speed (hot or cold) and the big valve simply cuts in to limit how high that pressure can get. It should have no bearing on anything if pressure is below the cut-in level (no pun intended).
Why is my oil pressure so low at the same time?
The gauge too is consistent with it reading very low at the same time – not quite on zero, but not far off. Subsequently, the person who rebuilt the engine, swapped over the oil pressure relief valve suspecting it was sticking for another, albeit this was a used unit that was known to be working previously fine.
How can I check the oil pressure in my JAG?
All of the electronics used to measure oil pressure in the Jag engines are potentially suspect. Fit a mechanical (Bourdon) gauge known to be accurate. As Marek says, make sure the engine has the correct amount of oil in it. I would drain the iil and refill the car with the correct amount.
What should my oil pressure be at idle?
That sounds a bit too low – mine reads 40psi when in D an at 2000 rpm, dropping to around 15psi when at idle and hot. Warning light doesn’t come on other than before I start the car. As your gauge and warning light are both telling you you have low pressure, you need to do some investigation – don’t ignore it.
The gauge too is consistent with it reading very low at the same time – not quite on zero, but not far off. Subsequently, the person who rebuilt the engine, swapped over the oil pressure relief valve suspecting it was sticking for another, albeit this was a used unit that was known to be working previously fine.
Put another way, your oil pump should be capable of providing pressure well in excess of 70psi once above idle speed (hot or cold) and the big valve simply cuts in to limit how high that pressure can get. It should have no bearing on anything if pressure is below the cut-in level (no pun intended).
All of the electronics used to measure oil pressure in the Jag engines are potentially suspect. Fit a mechanical (Bourdon) gauge known to be accurate. As Marek says, make sure the engine has the correct amount of oil in it. I would drain the iil and refill the car with the correct amount.