project91

My 91 3vz 4x4 is having a weird problem..at idle..there is no oil light on on the dash..while driving it comes on and remains on but sorta dim and flickery, let my foot off the gas and it goes away..running Mobil1 10w40....whats the dealio?

iamsuperbleeder

bad sensor maybe?

have you ever replaced it?

check it for leaks too...

rowdy235

check oil level, check with mechanical gauge, if everything checks out there, replace sensor.

project91

No leaks...I hate a leaky engine and make sure I fix and prevent any....Where is the sender on the 3vz..I may just swap to a mechanical gauge and check the pressure manually..it seems odd because to me if I had a problem it would be the reverse of the way its happening..it should come on at idle, and go away at higher RPM's where the pump is turning faster...?

iamsuperbleeder

now why didn't I think of that...

theoretically yes, assuming the sensor AND the oil pump is still good...


as far as where that sensor is on that motor, that's outta my field... imma 22re guy, sry...

project91

Alriht I connected a manual gauge to it today and at idle..it shows 80 psi...rev it up it goes to around 100 psi..very high when compared to the Haynes manual specs...!

Squiddy

These pressure numbers are pretty much what people around here get for the 3.o at start up and initial idle. Goes to 100 with rev. Once settles, down around 25.
The wire coming off the pressure sender is prone to bend/break at the sensor end. For pics on all this, see my recent link:https://www.yotatech.com/forums/f116...ensors-153167/ , I am going to update with my own pics when done (soon)

abecedarian

seriously?
sounds like the pressure relief valve is sticking.
but even 80 is high at idle, so there may be something plugging a passage down near the pump.

just a 22re

was that checked at hot or cold?

abecedarian

an oil pressure chart I found lists 3vze normal oil pressure at 4000 rpm should be between 36-71 psi

sounds like a problem

MMA_Alex

I don't know what pressure the regulator valve kicks in @ on the 3vze, but I doubt its anywhere near 80psi...

Squiddy

Maybe I am about to explode, but, like some others:
About 100 at cold start up
a few minutes later 25 at stable idle/cruise
bumps up as high as to 75 during acceleration

MMA_Alex

Just checked the fsm

3vze: 93 fsm says 77 psi on the relief valve

• 4.3 psi @ idle
• 36-75 psi @3k rpms

22re: 85 & 93 fsm say 64 psi on the relief valve

• 4.3 psi @ idle
• 36-71 psi @3k rpms