My 1983 Suburban (6.2 diesel) has always had steady 40 psi oil pressure.
Lately however the pressure is all over the place, varying between 10 and
80 psi. I changed the oil and filter (it was about time anyway) but no
change. I always keep the oil level topped off, and since I have an oil
leak (that predates the pressure problem) that I haven´t gotten around to
fixing, I check my oil level daily.
What things might cause oil pressure to start varying like this, and what
can be done to correct it?
Oil pump pressure relief valve or trash in the pan......
Either way u gotta drop the pan to fix it.
Are u sure the gauge is working correctly and is
not screwing with your head, obtain a mechanical
gauge and double check if in doubt.
The first thing that you should do is change the
oil pressure sending unit. GM oil pressure sending
units have always been notorious for doing this
kind of thing after a while. I've replaced literally
100's of them for this type of complaint. Start here,
and if that doesn't fix it, you will have to dig a little
deeper. If you don't want to spend money on
a sender that may still be ok, then you will need
to get a mechanical gauge and check the oil
pressure with that. But I'd guess that the
unit is faulty.
I'd agree with the gauge. Usually an oil pump either works or it dont. Not
typically sparatic. Gauges however will go sparatic. I mechanical line
type gauge will not lie to you. If it leaks you will see oil so they are
pretty trustworthy. Also very inexpensive. I think I seen them at Wal-Mart
the other day for 6 bucks. Cheap and easy way to diagnos your problem.
Good Luck. LKN4SNO
=================Warren Post wrote:
What things might cause oil pressure to start varying like this, and
what can be done to correct it?
==========================Shiden Kai wrote in.....
The first thing that you should do is change the oil pressure sending
I'd agree with the gauge. Usually an oil pump either works or it dont.
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