I am losing oil pressure when coming to a stop

1986 CHEVROLET MONTE CARLO
Avatar
BHAYES77
  • MEMBER
  • 7 POSTS
i have a 1986 monte carlo ss with a 305 we have rebuilt the engine new cam all new bearings (main,rob,and cam)all new gaskets new piston rings etc. before and after the rebuild now it loses oil pressure after it warms up when you first start it up it holds about 40lbs when it warms up it drops to 10-25lbs going down the road it holds 25-30+lbs when you come to a stop it drops to 0 what is wrong we have even changed the part the oil filter screws to
Nov 27, 2011 at 1:54 AM
Advertisement
Avatar
MHPAUTOS
  • CERTIFIED EXPERT
  • 31,937 POSTS
Did you fit a new oil pump?
Nov 27, 2011 at 2:09 AM
Avatar
MHPAUTOS
  • CERTIFIED EXPERT
  • 31,937 POSTS
Also did you check the oil clearances?
Nov 27, 2011 at 2:12 AM
Advertisement
Avatar
BHAYES77
  • MEMBER
  • 7 POSTS
yes it has a new oil pump and when we rebuilt the engine we did everything to factory specs we used plastgauge and set everything
Nov 27, 2011 at 2:14 AM
Avatar
MHPAUTOS
  • CERTIFIED EXPERT
  • 31,937 POSTS
check for a faulty oil pressure relief valve, i would start here.
Nov 27, 2011 at 2:16 AM
Avatar
BHAYES77
  • MEMBER
  • 7 POSTS
is that under the oil filter
Nov 27, 2011 at 2:20 AM
Avatar
MHPAUTOS
  • CERTIFIED EXPERT
  • 31,937 POSTS
To early to check on Mitchel 1 but it should be in the oil pump.
oil pick up not sucking air? not cracked in the pick up pipe?
Nov 27, 2011 at 2:37 AM