So my father in law bought a 99 Park Avenue with 70K on it and its fully loaded. Great looker and ran perfect for the last week he owned it till he started up and it sounds like all his lifters are banging to me. I looked in the oil cap and couldn't see oil moving thru there on the valve springs, not sure what happened here as I know that these oil pumps I thought are bullet proof pretty much. He ran the car around all day doing errons and than a few hours of it being shut off, he started it to this and I changed the oil out after looking at his dipstick which was full. I seen nothing in the oil, but it was dark and the sticker said he has a 1,000 left on it. But the oil was older according to the change date. I also ran a cleaner in the car before dropping new oil into it with zero luck.
Also the digital oil sender/signal is jumping up and down. With the old oil in it, it was going down to 25-40. Seems better with newer oil, but noise has not reduced at all.
Please help..... I need to know if I should start by taking the oil pan off to look at pick up tube or if you think the pump is shot?
Heres a video of it