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Oil pressure

Tiny
JIMMYZ326
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 79,000 MILES
Changed oil in 3.1 litre with correct oil I now have a tap or slight knock only after engine gets hot about 15 minutes, checked pressure and has very little at idle and slight more as engine revs, put a 15w40 weight in I thought as the oil gets hot the pump wont push it, the knock now just takes a little longer to kick in. I dont think there is any berring damage because it purrs purfect when cold. Do you think its the pump and how difficult to replace. Thanks for any help, ps were not driving the car to prevent any further damage, thanks jim
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Saturday, July 14th, 2012 AT 11:34 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What is the exact oil pressure?
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Saturday, July 14th, 2012 AT 11:42 PM
Tiny
JIMMYZ326
  • MEMBER
  • 3 POSTS
Im not sure the garage on the corner said it had next to none at an idle and a little when you rev the motor, I understood it as pretty bad, they want 900 to replace the pump but dont have it at this time trying to get a 2nd opinion what do you think thanks jim
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Sunday, July 15th, 2012 AT 1:22 AM
Tiny
RASMATAZ
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  • 75,992 POSTS
You gonna have to drop the oil pan and investigate, if its non existing at idle normal reading should be atleast 8-12 psi-the oil pump probably has failed or pressure relief valve is stuck open
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+1
Sunday, July 15th, 2012 AT 1:34 AM
Tiny
JIMMYZ326
  • MEMBER
  • 3 POSTS
Thanks so much for your help sounds like what im being told, thanks jim
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Sunday, July 15th, 2012 AT 2:11 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You're welcome
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Sunday, July 15th, 2012 AT 2:38 AM

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