+1 on that. Could be the simplest fix.

 

Is the pressure just falling to zero at idle, and fine under throttle? If so: https://dodgeforum.com/forum/1st-gen...-pressure.html


Are you slowly loosing more pressure as the engine warms up?

 

Has 10w-30 in it. We just put this motor in (junk yard motor). We let it run for a while after we got it in everything was good. The 2nd day after it ran a while the oil pressure dropped and started knocking. If you let it sit and cool down and restart it, everything is good till it warms up. We took the oil pump off my old motor and put it on the junk yard motor before we put it in. There were some metal shavings down in the pan. Wondering maybe if a piece messed the pump up or something.

 

Typically metal shavings in the oil pan is NO BUENO!

I would drop the pan and take a look and see if you can't find the cause and cut the filter in half to see what is inside there. I'd also take the valve covers off to make sure there's nothing wrong.

My gut feeling is you will find your problem when you remove the valve covers though...

 

My original motor "died" from the piston having a piece broke off and the wall being scared. That is probably where the pieces came from. I was thinking the oil pump is what is causing my problem now, some say main bearings.

 

A dying/dead oil pump definitely will cause you to lose all pressure and knock pretty rough. It's just such a PITA if you replace and then get up and running and realize the pump wasn't the issue.

 

Thanks everyone. We decided we are going to replace the motor since it is still under warranty.