What controls oil pressure in a 3.9L 1994 Dokata? After having the oil changed
the oil filter cartridge was balloned out. I've been having problems with low
or zero oil pressure. At first the delership said it was sludge build-up. Now
I'm not too sure. It has 120K miles on the engine. I've put a new oil sending
unit on with a mechanical gauge teed into the unit. Going down the freeway @ 55
mph, I noticed the gauge read 0 psi,and the light came on shortly.Having no
place to pull over,I continued home (about 20 miles). No knocking, or rod
knock,but I am concerned that this could happen again. Oil level OK. What's
Pressure is controlled by a relief spring in the
oil pump. High pressure pumps have a stiffer spring.
Worn out bearings, seals, and oil pumps can also
cause low pressure.
If the filter was balooned out, that means the
pump is capable of producing a good amount of pressure.
But it's getting stuck in the filter. Most likely
whoever is changing your oil is using the
cheapest/worst filter available. Probably a Fram.
Switch to a quality filter: Purolater, Wix, Napa Gold.
If your gauge is reading 0psi, but the engine is
running fine, you probably have a bad pressure sensor.
Get a real gauge (like Autometer) and see what your
pressure actually is.
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