If u canged your oil filter and oil and this did not solve your problem there is a check ball in the oil filter housing the may be stuck because of worn spring or gunk build up
PS to previous comment: i HAVE SEEN ONE OIL PUMP (IN A CHRYSLER CAR) DO THIS EXACT SAME THING I found the problem after tearing down entire engine: the pump driveshaft was actually spinning inside the pump gear.It actually was tight enough so it could not be finger turned but when shaft was secured in a vise, gear could be turned with little force using pliers.(first and only one I ever saw like that in thirty yrs...but it shows you...it can happen!
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first you will have to say what the oil pressure is cold, idle and 2000 rpms and then hot idle and 2000 rpms before a decision to advise about a rebuild can be made
there are many reasons oil pressure can drop and not all require a rebuild
I am going to take a stab at this....as I think you may have a head gasket that has blown out. The head gasket will cause a lil white smoke, and make idling extremely rough. Sometimes water will fill up in the top of the cylinder in the compression chamber when this leak, even minor occurs. That would explain some of the compression issues. Obviously with no compression it will not run properly or even fire if there is water vapor pentrating into chamber mixing with fuel giving you that white smoke/steam.
These are somewhat time consuming to change, but not difficult. The backfiring is caused by the computer trying to compensate for the firing issue. The computer when you change the head gasket is easy to fix. After repairng gasket, try to start the car a few times but not allowing it to run as it will just continue backfiring. Turn key off, let the vehicle set about 30 minutes or so, then go back and the vehicle should run properly again.
What you describe is signs of a failing oil pump. As the pump gets more and more out of spec the more it will act this way. If the pressure is dropping to the point of knocking plan to install and oil pump in the motor before too long.
You definitely need to put a mechanical gauge on there and check for ACTUAL oil pressure. It is possible that the passageway to the sending unit may be plugged with gunk. If oil pressure is not correct or if in doubt, do not drive it 'till you know for sure what's going on in there. No noises tells me that it is likely not serious but an engine is just too expensive to gamble!!!
Oil pressure might actually be a bit high for idle. High or low oil pressure in an older engine tends to be indicative of some serious issues. Oil pressure that is too high tends to be a clue that you have serious carbon build up. That aside, have you tried running a higher octane fuel, or perhaps adding an octane booster to your normal grade? Pinging can become knocking in a badly worn engine. One recommendation: At your next oil change try substituting a quart of marvel mystery oil or lucas engine oil treatment in place of one quart of your normal oil. Both have some pretty good track records for helping to free up sticking valves and break up carbon in older engines. I'm an old timer myself, and I personally swear by Marvel for older engines. There is no "rebuild in a can" but Marvel comes close. Give those a shot, let me know what happens.
Oil pressure might actually be a bit high for idle. High or low oil
pressure in an older engine tends to be indicative of some serious
issues. Oil pressure that is too high tends to be a clue that you have
serious carbon build up. That aside, have you tried running a higher
octane fuel, or perhaps adding an octane booster to your normal grade?
Pinging can become knocking in a badly worn engine. One recommendation:
At your next oil change try substituting a quart of marvel mystery oil
or lucas engine oil treatment in place of one quart of your normal oil.
Both have some pretty good track records for helping to free up
sticking valves and break up carbon in older engines. I'm an old timer
myself, and I personally swear by Marvel for older engines. There is no
"rebuild in a can" but Marvel comes close. Give those a shot, let me
know what happens.
Have a shop verify the pressure is really low, it could just be the sending unit is defective for the oil press guage, but get it checked, if it really low you could burn out the bearing in your engine, a very costly repair.
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