Went for a run, looked down needle is in the red for oil pressure....oh ****! Still moves when you rev it but stays in the red! Check oil..full, no lifter clatter. Drive it home(if its foked, it already is), on the way sounds like it has bottom end clunk, like spun bearing, makes it home. Now the tricky part, next morning fire it up cold, has 45-50 pounds of oil pressure, brake it, rev, no bottom end noise. huh? Let it idle for 5-10 min to warm up, oil pressure goes back red. Drive it, still have clunk sound. but can't tell if it is engine produced or drive train? Brake, rev, no clunk???????????? I'm guessing oil pressure sending unit? whatcha think?
ps also noticed the needle was reading about 10lbs lower than it used to before this happened???????

 

I had that happen to me in my old 300zx once. It scared the hell out of me. I would rev it up and the oil pressure would come barely out of the red so I was like wtf??? it runs fine... I checked and the sending unit just came a little loose.

 

i'll check her thanks!

 

Well im about 110% sure you spun a bearing. If its clunking or knocking then you know it has little to no oil pressure. Time to rebuilt it. Sorry to be the bearer of bad news

 

Id say replace the sending unit and see what happens.

 

bearer, but why does it have 40 -50#'s when I start it up???

 

Dont think the sending unit is the issue, but start ruling things out.

 

oil pump...

 

Change the oil and check for metal in it. That will tell you if you have serious problems. If it's got a lot of small metal pieces in it, you have a spun bearing.

 

well ran it tonight, it definetly has the death rattle. Well it was pushing fifteen pounds of boost for a while, guess I can't bitch too much. Even thought it was forged, I guess **** happens with boost. Anybody got an extra 406 sitting around......do you take paypal? hahaha.