Question about 1995 Toyota 4Runner

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Oil pressure Recently bought a 93 4X4 4Runner and the oil pressure is normal on cold start. When the engine warms up the pressure drops significantly below normal operation range. Does anyone have an idea or solution for this?

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My 93 6cyl 4wd has 230,000 miles. The Oil pressure will remain between the two middle lines on the gauge AT SPEED but may be lower when very hot and idling. It has been like this for at least 50,000 miles.

WBob

Posted on Oct 01, 2008

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Usually the cam bearings or main bearings are worn

Posted on Sep 22, 2008

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96 chevy cheynne 5.7 vortechas about 40to50 pounds oil pressure when first sart in morning and when it gets to temp. it drops to 20to25pnds and at a stop it goes to 0 and gauge light comes on until i give...


Well it could be the sending unit for the gauge.
But odds are the oil pump or engine bearings are worn out.
As the engine warms up, the metal spaces expand and the oil gets thinner. The oil pressure drops some under normal conditions, but not more than 10 or 15psi. Normal idle pressure with the engine warmed up is probably 25psi.
You could check oil pressure with a mechanical gauge to make sure its not the sending unit.
Once the oil pressure starts staying below 20psi for long periods you'll start hearing noises.

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When the engine and oil are cold it will show a high pressure because of the viscosity of the oil. When it warms up the oil is thinner. If it doesn't drop below 20-25 psi at warm idle I wouldn't worry about it as that is normal.

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It plunges down to zero at times then reads eratic


Your oil becomes too fluid as the engine gets warmer. When the engine rotates slower at stops, the oil pump won't make pressure. At speeds, more oil is pumped and the pressure rises.
Have you recently changed your oil? Or maybe is too old. The real problem would be if you read zero at normal cruising revolutions.

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