99 Park Ave Oil problem? Lifter Banging?(Video Included)

[speedzonwheels]

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?

Thanks
Conrad

Heres a video of it

[Machina]

99 pk ave. Had knock at a stop sign, hurried up and rolled oil pressure over had 23lbs/single digits killed motor had towed to mechs, thought I lost rod bearing because I had the exact same sound on a 92 before it puked a rod.

Mech checked things out said a couple lifters collapsed,replaced all of them plus some other issues with upper manifold leak that I was having. didnt stop the clatter, and oil pressure still very unstable and flucuating radically. Puzzled he tears it back down thinkin he got some bad lifters, nothing, everything fine. I suggested we go for the oil pump seeing it had 200k. Replaced pump, pressure relief spring and for good measure went for the rod and mains, they were bad. Drove car 15 miles, Oil pressure came up but still radical and after engine heated up to normal operating temperture and went to idle it almost stalled due to lack of pressure. Turns out a journal or rod is egg shaped and bottom end is knocking. I asked if he plasta guaged the new bearing, assured me he did.Think he missed alot and misdiagnosed the problem. What stayed constant througout all the repairs was that radical oil pressure which is something I never had before with these motors, probably in your case being only 70k something less severe like a plugged pickup screen from oil chg neglect or pressure relief spring, maybe pump also. Good luck, lots of smart people here im sure someone will hit on it.

Machina

[82Stang]

Originally Posted by speedzonwheels

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?

Thanks
Conrad

Heres a video of it

First remove the oil pan and check that pickup tube. If it was not maintained oil changewise then the sludge might have gummed up the pickup. Our 99 is pretty durable. I'm not a fan of engine flushes, they tend to wash down the bearings. Rather just check and verify the oil pump and pickup then drop the oil for new 10w-30 and recheck. If it was that bad in there, I'd run it for 15-30 mins and drop the oil again. Oil changes are cheaper than engine rebuilds. And also change the oil filter each time, it matters. Good luck.