Hi and thanks for using 2CarPros.
It is unlikely that the pump just failed. However, pressure cannot be check without the engine running. Was the oil light staying on?
Now keep in mind, the noise may not even be the engine. It could be one of the belt driven accessories. Open the hood and make sure the serpentine belt is not frayed or excessive loose. I attached a picture of the routing. If it is tight, remove it and check all belt driven accessories for excessive play or bearing noise.
Next, about a year ago, a customer came in with the same type vehicle that had a knock. It sounded like the engine was done. After diagnosing it, I found the harmonic balancer was bad. There is a rubber molded mount between the base that is bolted to the crankshaft and the outer portion of the balancer. I replace it and the noise was gone.
If you remove the belt, start the engine for a couple seconds to see if the noise is gone. That will tell us a lot.
Let me know what you find or if you have other questions. Also, have a helper start the engine while you confirm the noise is coming from the engine.
Take care,
Joe
Image (Click to make bigger)
SPONSORED LINKS
Monday, December 3rd, 2018 AT 8:29 PM