floortom Posted January 3, 2007 Share Posted January 3, 2007 no pressure in loyale....no history on car. there is a minor change when cold but goes to zero in ten mi......is it terminal? Link to comment Share on other sites More sharing options...
Prospeeder Posted January 3, 2007 Share Posted January 3, 2007 try a new pump before you destroy the engine. If its not nocking liek crazy and the lifters arnt screaming. If even the lifters arnt screaming your sender could be messed up Link to comment Share on other sites More sharing options...
Bill90Loyale Posted January 3, 2007 Share Posted January 3, 2007 What leads you to believe that the pressure sending switch (on the pump) is good? Link to comment Share on other sites More sharing options...
heartless Posted January 3, 2007 Share Posted January 3, 2007 first off - what grade of oil is in the engine?? 5w-30 will definitely give a MUCH lower reading than 10w-30 (personally, i dont recommend using the 5-30 in a Subie - learned this one the hard way) secondly, it is fairly common for the "guage" to read very low at normal idle on a warm engine. is the car drivable? if so, take it for a test drive and see what kind of reading you get at normal speeds. and keep in mind that the stock guages are not dead on acurate - they will give a general idea, but thats it Third - engine sounds? does it have the "tick of death"? other rattling/clacking type noises?? I would not say any car is "terminal" just because of a low oil pressure reading... Link to comment Share on other sites More sharing options...
Brumby Boy Posted January 3, 2007 Share Posted January 3, 2007 Have you used a mechanical guage off the ump or are you going with the one on the dash? Link to comment Share on other sites More sharing options...
GeneralDisorder Posted January 3, 2007 Share Posted January 3, 2007 Verfiy the reading with a mechanical guage. The stock senders are known to read low or not at all. I find that oil pressure problems are almost always the sender, or the pump/pump seals. GD Link to comment Share on other sites More sharing options...
bgd73 Posted January 3, 2007 Share Posted January 3, 2007 As GD said, verify guage if engine is quiet. If pressure is in the 40s cold and then drops, it is getting aired someplace. oil pump seals.. Verify the pump is true by hand spinning after taking it off.. at the pace my last 3 soobs went, that pump could be pulled from an ancient pile of soob parts for another project a 1000 years from now. All other seals don't matter except for the head gaskets to keep good pressure- and you will obviously know when those are bad. If engine is quiet, as gd said verify guage before anything, and the obviuous wet spot will have a drop dangling from the bottom side of opump area . I just reseated one, it was well worth it. buries at 85psi in the cold, and made wet spots at the top of the cam casings before they seeted to the new pressure. (defied gravity entirely). It even sounded like a turbo for awhile...I made a site to add to my old soob stuff. The trochoid pump is quite a power house for the little engine. They are nowhere near this disciplined now... http://93loyale.com/opump.html Link to comment Share on other sites More sharing options...
idosubaru Posted January 3, 2007 Share Posted January 3, 2007 owners manual, go through one for the vehicle you have, lots of good info in there. it will state that oil pressure reading around zero is normal. they typically read low..near zero. replacing sending unit, resealing oil pump and even replacing the oil pump will help some...but even after all that they typically read low after warming up and at idle. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted January 3, 2007 Share Posted January 3, 2007 owners manual, go through one for the vehicle you have, lots of good info in there. it will state that oil pressure reading around zero is normal. they typically read low..near zero. replacing sending unit, resealing oil pump and even replacing the oil pump will help some...but even after all that they typically read low after warming up and at idle. I've been able to get all of mine (including my 230,000 mile sedan) to read at least 20 psi hot idle with a new (OEM) sender, and new oil pump and/or seals. I have yet to encounter a properly sealed up engine that wouldn't register correctly. I think the reason they put that in the manual is that reading 0 at idle is alright as long as the guage comes up when you rev it - just means the seals are a little old, and the sender is probably leaky. GD Link to comment Share on other sites More sharing options...
idosubaru Posted January 3, 2007 Share Posted January 3, 2007 i've found it common to still read near zero even with new oil pumps and senders. my point is the original poster probably doesn't have anything to worry about, like the owners manual states assuming it goes up with RPM's. Link to comment Share on other sites More sharing options...
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