I completely rebuilt the engine on my 1998 toyota camry. I drove it for 11 months with no problem. then the oil light came on. The oil level was fine . I checked the oil pressure with a manuel oil pressure guage and got 5-8 psi. I checked the oil pump and relief valve . I replaced the oil pump and had the same problem.I took off the valve cover and I do have oil on the top end of the motor. When I started the car the oil went up on the windshield of the car. I blew air through the pressure side of the block where oil pump, pumps the oil through and checked witha manuel oil guage and got 30 psi. Do you have any ideas on what I should be looking for to fix this problem ?
It sounds like your oil pressure sending unit may be plugged by whatever took your pressure down to 5-8 psi the first time. this is extremely low pressure as i am sure you know but at 30 psi your light should go off i would replace the sending unit if your oil pressure is holding 30
SOURCE: low oil pressure
Just guessing, but it sounds like you are loosing pressure from the bearings.....If you had the crankshaft journals cut, or if they were slightly out of round to begin with, this can happen. Cutting removes material...the journals on most modern engines are too thin to do this (same weight saving idea that gave us rotors that you need to throw away) After cutting, they go egg shaped. Not cutting and starting with out of round condition will essentially give you the same problem but may take a bit longer to fail.
Of course, check all clearances and sealing points, but I believe that's where you will find the problem.
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