I think my expedition may about to die

[MaxSoszko]

My expo might be about to die there is a real bad knocking coming from the engine and the oil pressure gauge is jumping around everywhere will go to low then to normal then back again

 

[toms89]

Thats not good! Did anything preceed this or did it happen out of the blue? From your desciption my first guess would be rod knock, maybe a spun bearing?

I would check to make sure you dont have a spark plug ready to eject itself..... but usually that is accompanied by the sound of an exhaust leak and doesnt seem to fit your description.

Where are you located? I will have a spare 5.4 engine soon.

 

[KWT2000]

sounds like you have spun a bearing.... drop the oil and cut open the oil filter for signs of metal

 

[walnuts4x4]

yeah what they said... loud knocking is never good.... but I would start with what KWT said to give you a starting point...

 

[tmajikman]

yeah what they said... loud knocking is never good.... but I would start with what KWT said to give you a starting point...

This.^

 

[MaxSoszko]

ok thanks for the info

and toms89 im in Illinois and i think if this engine goes either i will get something diesel for work or i would drop a supercharged mustang motor in the expedition

 

[jacks3am]

4.6 stroker!

 

[walnuts4x4]

easiest would be a lightining motor swap....

 

[panda24619]

or a 5.4 stroker. had to find, but not to many people have them. but i want to do a lightning swap now that i see so many doing it and its easy to do with the right tools.

 

[Thermo]

Max, it is possible you have a bad valve seal and that is causing you to burn oil (may not see the blue cloud coming out the rear of the truck complements of the cats) mixed with a stuck lifter. I have fought this very problem with my truck and found the bad seal along with a lifter that did not want to maintain the proper tension on the lifter. New valve seals and a new lifter fixed things with no negative effects. Granted, as soon as I noticed the oil pressure bobble, I happened to be near a parts store and immediately checked the oil level and found it really low. IN my case, the lifter noise had been there for a little bit, but the oil seal issue popped up almost overnight.