Oil pressure

[mkIII213]

For a reason I am unsure of, my car has very low oil pressure once the engine is warm. After a cold start the pressure is normal, but once it warms up, it drops down to the lowest notch on the oil pressure gauge and just rises a little bit once I reach the 3k rpm mark.

What would be causing this?

[IJ.]

Worn out engine.
(it would pay to confirm it actually has low oil pressure with a mechanical gauge)

[mkIII213]

Worn out engine.
(it would pay to confirm it actually has low oil pressure with a mechanical gauge)


So you are saying the engine is crap? I will probably do that oil pressure check asap.

[IJ.]

Nah not crap just tired ;)

[mkIII213]

Nah not crap just tired ;)

Alright, I get what you mean. So what could I do to fix it? Is it just needing to be rebuilt?

[IJ.]

Check it with a mechanical gauge first then decide on a course of action.

[mkIII213]

Check it with a mechanical gauge first then decide on a course of action.


Will do, I appreciate the prompt replies!

[IJ.]

No probs just sitting around killing time ;)
(too early here to go out and do more tuning)

[brs86supra]

not trying to hijack the thread, but what would make the oil pressure sky rocket all the way to the top of the guage? heres a vid of what im talking about.
http://i247.photobucket.com/albums/gg159/disturbdgt/supra%20and%20supra%20meet/th_030.jpg (http://s247.photobucket.com/albums/gg159/disturbdgt/supra%20and%20supra%20meet/?action=view&current=030.flv)

[IJ.]

Seized relief valve or over shimmed Oil Pump

[HommerSimpson]

sending unit shorted out... wire going to sending unit is grounded out.....Or presure relief valve stuck...

[brs86supra]

well i know that the pump isnt shimmed, but not sure on the reliefe valve. could it be doing this with too thin of an oil or something or maybe clogged filter. iirc i think i put 5w-20 full synthetic in there last oil change (which i believe was a bad mistake)

[brs86supra]

ok gotta quick question, could the fact that i am using the gte oiler cooler and filter bracket on the ge motor cause this, seeing that there is a releif valve in the gte filter braket and one in the oil pump also, or no

[jdub]

5W-20 is a bit thin, but it won't make your pressure shoot up like that. Sounds like the oil pump relief valve is stuck. The relief valve in the filter head should not cause this...a common mod is to eliminate the stock filter head and go to a full flow cooler circuit.

[brs86supra]

so if it is the relief valve, how would i know which one it is?

[Rennat]

whats up with your battery gauge though? dont drive the car much or what?

[brs86supra]

im not sure, i think the battery may not be strong enough for the car or something, but the voltage does go up once driving the car around, up to 12. so could this high oil pressure hurt my motor

[Rennat]

doesnt too high a oil pressure 'wash' the bearings? i just remember that from my DSM days when people would say 90-100psi on a cold start up was bad...

but more importantly, its finding the cause of it, i would double the check the wiring to the sender, along with the grounds on the battery just in case.

[brs86supra]

well the wiring to the sensor is good, cause if i unlpulg the wiring from the sensor it will not read anything. and the battery grounds are all good. so where would i go from there. b/c the gte oil filter bracket adn teh oil pump both have relief valves. so what should i try to do first. could two relief valves be a bad thing

[jdub]

High oil pressure does not "wash the bearings"...you do need to find the cause. My bet is the oil pump relief valve (like I said).

[Rennat]

i didnt think so, everything i learned on the DSM forums has been shattered here, so anything i remember from there i take lightly.

just go pull the GTE filter head off and see if the problem is fixed.
but i see why it would have to be the oil pump one first, as thats the first bleed off for pressure...

[Zumtizzle]

that pressure sensor wire must be grounding out somewhere. ;)

Does it shoot off when the motor is off?

[CyFi6]

With the key on and the engine off, does the oil pressure gauge read any pressure?