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Question

91 chevy 1500 4X4 350 auto   major oil leak that apears to be coming from the intake manifold in the rear, when checking things out I noticed the oil pressure is reading higher than normal 35psi when it is usually running 15 or lower when hot, i know the truck had a rod bearing starting to knock but why the increase in oil pressure shoulnt it be getting lower???

Submitted: 60 days and 23 hours ago.
Category: Chevy
Value: $15
Status: CLOSED
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Optional Information

Year : 1991
Make : Chevrolet

Posted by Joe Barfield 60 days and 21 hours ago.

Answer

Hello, You may just have a oil sending unit leaking its right behind the intake.....easy to change just screws in like a spark plug......however you will need the scoket for oil sending units.......Thanks Joey......Thats why your oil pressure goes up & down

60 days and 15 hours ago.

Reply

already checked that, the oil presure is fairly stable about 35 psi under load and only droping to 20 -25 psi at Idle. Normally at idle in gear it drops as low as 5-10 psi and the slight knock could be heard???

Posted by Joe Barfield 60 days and 14 hours ago.

Info Request

Well, I guess you know the engine needs to be rebuilt......91 & knocking.......Joey

60 days and 14 hours ago.

Reply

yes but any reason for the sudden increase in oil pressure???

Accepted Answer

The sending unit must be faulty........or the valve in oil pump could have been stuck,however unlikely......Joey

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Expert: Joe Barfield
Pos. Feedback: 97.6 %
Accepts: 
Answered: 9/23/2009

Master High-Tech

36yrs.in Auto Industry, Aamco Trans.Master..

59 days and 13 hours ago.

Reply

Relist: Other Not happy with the responce so I reworded the question??? in another form no responce needed

Posted by Joe Barfield 58 days and 19 hours ago.

Info Request

ok

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