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Is this normal oil pressure?

Discussion in '1st Gen 4Runners (1984-1989)' started by Saul, Jun 23, 2023.

  1. Jun 23, 2023 at 1:58 PM
    #1
    Saul

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    Saul [OP] New Member

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    2AF4B65F-8C55-4BA7-95F0-C45034B3E21B.jpg I don’t know if this normal oil pressure. It goes down when idle but when running it goes up.
     
    Saul, Jun 23, 2023
    #1
  2. Jun 24, 2023 at 12:03 PM
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    PhantomTweak

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    PhantomTweak New Member

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    Patrick
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    None. Bone Stock. EXCEPT: Brushguard, tow hitch, both welded to the frame. It's good to have friends and a fully equipped garage!
    On these trucks, once the engine is good and hot, the oil pressure should be aboout 4-6 PSI when idling, and about the center of the gauge, I believe around 50 PSI, when the RPMs are up, say around 2500 RPM or so. I might be wrong on the higher PSI, but I'm pretty sure I'm close.

    The gauge on the instrument cluster is notoriously inaccurate in these things. It might get down to almost zero when good and hot, and at idle, but then go up around the middle of it's throw when the RPMs are up higher.

    All this is out of the 3rd gen FSM I have. I can dig up the appropriate page and post it if you want...
    Pat☺
     
    PhantomTweak, Jun 24, 2023
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    Saul[OP] likes this.
  3. Jun 24, 2023 at 1:13 PM
    #3
    BearBio

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    BearBio New Member

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    It's between the "OK" lines but I'd watch it! My pre-Taco truck ran about there. Is your engine kinda old? Mileage?
     
    BearBio, Jun 24, 2023
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  4. Jun 25, 2023 at 8:59 AM
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    trlhiker

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    trlhiker Lazy Bum

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    If this the 3.slow then yes it is normal. Mine has been like that for 30 years. Low at idle, normal driving.
     
    trlhiker, Jun 25, 2023
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  5. Jul 7, 2023 at 10:30 AM
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    Saul

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    Saul [OP] New Member

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    That would be cool if you would get that information for me. I think I messed up.I got a 1985 4runner and I it was sitting for a while, and on a gas tank that’s been sitting for years. I was thinking I was going to do the right thing by putting fuel treatment and now it roughs idle.
     
    Saul, Jul 7, 2023
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  6. Jul 7, 2023 at 10:32 AM
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    Saul

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    Saul [OP] New Member

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    Yeah. Around 250
     
    Saul, Jul 7, 2023
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  7. Jul 7, 2023 at 10:50 AM
    #7
    DirtyHairy

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    DirtyHairy Card-holding Member

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    Slightly off topic but my 78 FJ40 suddenly lost all oil pressure a couple years back. Turned out a wire popped out of its clip. My butt puckered when I saw no oil pressure.
     
    DirtyHairy, Jul 7, 2023
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