Ever since I got the car, there has been an oil light at startup. It remains on for about 10 seconds, unless I rev the car (reving to about 3k makes it go off almost instantly). (SR20DET)
Followed with the light, I do get timing chain rattle, so it doesn't sound like a bad sender.
If the car has only sat for a very short while (less than a few minutes) the oil light doesn't come on at start. If it has sat for 15min or less the oil light goes off much sooner.
I have replaced the tensioner with the newer designreplaced the oil pickup gasketreplaced the oil pan with a greddynotched the pickup a-la s14 pickup
Ran at least a few different engine flushes, detergents, and oil weights to no avail.
I originally figured that $1000 or/so for a new long-block was no big deal, and would drive the motor until it blew since it probably was messed up already. However it has been since febuary of daily driving it with no issues arrising.
No bits of bearings in the oil pan, no metal shavings, no abnormal cam wear
Here is where it gets slightly strange, when replace the oil strainer gasket I noticed that the oil pump orrifice looked dry, along with the strainer tube itself. As if its not sucking up any oil.
However oil is definitley circulating, as it gets dirty and there is oil pressure after I rev the engine a bit.
So my only thoughts at this point are - somehow the oil pump is sucking oil from somewhere other than the pickup?
Or possibly there is a restricted passage right around the oil pressure sender and the timing chain tensioner (as they are right near each other).
The only things I haven't checked obviously are the pump itself and the relief valve. However the removal of the subframe/lower pan makes me rather just swap the motor out for a known good one than go through the bother.