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low oil pressure

pauljmcnulty

pauljmcnulty

Active member
Copied from another thread, advice please! [:)]

Hi all
I am a new user to this forum and im in much need of some help ... my porsche 944 is ill :-(

I have low oil pressure - i have changed the sender gauge and the oil light is still on. The car runs fine when idoling cold the oil gauge reads 1bar - then when idoling hot the guage reads 3bar.

Can anyone shed any light on what it could be?!!

Cheers
Click to expand...
 
Read this: [link=http://www.clarks-garage.com/shop-manual/lube-03.htm]http://www.clarks-garage.com/shop-manual/lube-03.htm[/link]
 
Sounds a bit odd 3bar when warm is fine, it sounds like a sender problem. Did it start to happen after you changed the sender or before?
 
Sounds like pressure relief valve failure on a series one oil pump. You can fit the later series two (September 1985 >) part to rectfy it for good. A good diagnostic step would be to increase the tickover speed very slightly, if the oil pressure jumps up by a couple of atmospheres then Id be certain. Simon
 
At cold idle oil pressure is high - 4 - 5 bar. When warm at idle 3 - 3.5bar is fine and under power 4 - 5 bar. Does this sound like what you're getting?
 
One bar on cold tickover but higher pressure when its ticking over warm indicates that the PRV is opening under (too low a) pressure.
 
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