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1996 Chevy Blazer oil pressure drops

Tiny
TJH2368
  • MEMBER
  • 1996 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 77,000 MILES
My 96 blazer has an oil pressuer of 40 psi when it is first started and cold but as the engine heats up the oil pressure drops the hotter it gets the lower the pressure gets until it is in the red when I give it gas it goes up the back down when I let off the gas I just put new head gaskets on it a new crank, oil pump and oil pressure sendind unit and it still does it why no it does not rap at all if I dont fix it will I have a problem later
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Wednesday, February 6th, 2008 AT 4:53 PM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
There is too much clearance somewhere in the engine, possible cam bearings, does the engine rap at all hot or cold? If not dont worry about it.
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Wednesday, February 6th, 2008 AT 4:59 PM
Tiny
TJH2368
  • MEMBER
  • 2 POSTS
No it does not rap at all but if I dont get it fixed will I have a bigger problem later
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Wednesday, February 6th, 2008 AT 5:08 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
I have worked for gm for 10 years. That engine needs as little as 3psi oil pressure when hot. Remember your oil pressure sending unit is at the very end of the oil pressure line. I would leave it alone. Its my opinion and is what I would do, unless you want to completely overhaul the engine again.
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Wednesday, February 6th, 2008 AT 5:12 PM

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