This car I picked up for free. It is in really good shape But I was told it had a knock so I towed it home. 1990 TownCar 302cid
So I removed the oil pressure sensor and put in a gauge in it's place. Then cranked it up. (Still has old oil in it ~1.5 years old, sat for a long time)
The pressure gauge was bouncing quite a bit (cheap gauge). But it went to between 20-35 psi when cold and at idle. Went to 25-35 when revved. I revved the engine up quite a bit trying to hear the knock. I could not hear it with just my ears. Didn't have any body to rev for me so I could listen with hose or stick.
So I let it warm up...
Now the oil pressure is between 4-8 psi at idle. Still no knock.
I rev it and pressure goes to 10 psi. Then I can hear a knock but only when I rev it pretty high does the knock sound off and only do I hear it as I let off the throttle then no knock as RPM's come down then it knocks some more when it reaches idle for a split second then no knock again at idle.
Basically it does not knock as RPM's go up or down just in between.
The knock sounds to me like it is from the bottom end. Sounds "loose" if you know what I mean. Deep thunk, clank, thunk then smooths out and no noise.
So I drain the oil. It is very thin but is not burnt. It has a Fram filter on it. My plans are to try and add 20W 50 oil and either a wix or motocraft filter.
Do you think this will "revive" it? I know some harm has come from the knock but since it doesn't knock when cold I am hoping the damage is minimal.
Also do you think the oil pump may be the cause of this issue as well?
I will change the oil and post an update.
Please give me your input and experiences and even suggestions as to what I can do.
Otherwise it is time to do a GT40p swap. LOL.
One more thing. This is the info I got from the guy who gave it to me:
New air suspension system installed Erwin Miller shop. Most engine work has been done by Miller. Front suspension has been rebuilt.
New timing chain, gaskets etc, new radiator, but Miller did not put on new pump which caused overheating problem and engine oil pump crash
Car has about 120,00mi
Car top is new 2006, done in Cinci $900
New tires 2008
I think the exhaust is new
Have replaced door electric window motors several times but they are a constant problem, issue with those years of Lincoln
Radio does not work well, wipers Ok, door locks Ok, trunk Ok, hood latch is problem have had it adjusted several times have to really push down to get it latched
Have had the steering gear box rebuilt in Cinci but is is leaking again. Power steering pump original.
Brakes should be new
Air conditioning has been converted to new Freon stuff. Worked well in Myrtle Beach
Has been sitting since spring 2008
Used to be my dads car. I have probably put $6000 in maintenance/repairs since owning it. Really a nice riding car. If I had a garage, I would have keep it going but, no time or place. Hope you can drive it.