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Oil Pressure at 60lbs+

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KENT, Jul 9, 2001.

  1. KENT

    KENT 1/2 ton status

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    While driving home for lunch to day my oil preasure was pegged! 60lbs +. This is much higher that normal (40-50lbs). I also noticed a whiring - grinding noise coming from the engine compartment.

    Should I freak out? What could be causing this?

    This really bites, because I just got this suspenssion and axel swap done. Now this!

    Kent

    1989 K5
     
  2. newyorkin

    newyorkin 1 ton status

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    Dang, I'm jealous. I'm running near/at zero when in gear full warm up/full stop.

    Sounds like something wierd for the pump to do. Maybe theres some kind of clog just before/after the filter? try changing the filter and the oil and see if it gets better.
    350's have an oil filter by-pass path. If the filter's mucked up and clogged, might be forcing oil through the bypass (I vaguely remember something about 10psi in the by-pass; maybe it adds 10 psi to the norm if it is used?), creating your high pressure and harder working pump.
    That's just what I'd think, though. I've never seen this happen or heard of it actually happening. Otherwise, I'm out of ideas...

    Ratch
    <A target="_blank" HREF=http://k5.8m.com>http://k5.8m.com</A>
    **K5 - What more is there to life?**
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Freak out.
    First off the oil pressure gage is after the oil filter. the 10 psi drop that wasion the other post is due to the filter killing some pressure. The pump would be working the same or less not harder if going through the bypass.
    The fear here with the noise and the extra pressure is that you spun a bearing in the lower end. When a bearing spins it blocks off the oil passage to that bearing and will increase your oil presure. This could be bad. There is no other reason for a sudden increase in oil pressure. Pull the dipstick and look for water in the oil (chocolate foam) and get the oil in a bright light while on your finger and look for metal flakes in the oil. You got metal or the brown foam you got problems for sure.
    Also before freaking out real bad see if the noise is from alternator or anything belt driven. I have had something go wrong and then you get that "what's that noise syndrome" and noises that have been there you sudenly worry are something else. Check the wire for the sender and make sure it's connected.

    It's not my damn planet monkey boy!
    <A target="_blank" HREF=http://communities.msn.com/OffroadK5s>http://communities.msn.com/OffroadK5s</A>

    Grim-Reaper
     
  4. Chaotic

    Chaotic Newbie

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    My Pressure did the same thing....

    I went on a long road trip and by the time I was on my way back home my pressure shot up and pegged at 60... so I did all the things that Grim- mentioned and everything seemd ok... changed everything and still it pegs.. If I'm at low idle its sits at 30 as soon as I give it a little gas BOOM.. pressure goes ski high.... but this has been doing it for about 4 months and I have not had any engine problems...

    Could it be the gage?

    85 Jimmy, 4 " Sup lift, 37" SSR's & they don't rub, Dana 44, 14bf
     
  5. riz

    riz 3/4 ton status

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    <font color=purple> My Impala does the same thing but after about 20 mins of driving it comes down some. It runs like a top too.

    L8r,
    . Riz . <A target="_blank" HREF=http://www.geocities.com/rizmonkey>http://www.geocities.com/rizmonkey</A>
     
  6. KENT

    KENT 1/2 ton status

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    Oil looks fine. A little dirty. No signs of any metal or water in the oil. I went ahead and changed the oil and filter. took it for a test drive. Runs fine except the noise is still there. It sounds like the heater blower is running, but it's not.

    You might be right about the noise. I might be just getting paranoid, but even paranoids have engine problems!

    Kent

    1989 K5
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

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    30lbs at idle is good, most stock engines run at aboot 20lbs. at idle... And 60 lbs while driving is excellent also. All oil pressure gages should move when you vehicle starts to move. The engine rpm's increase and the oil pump speed and pressure increases which in turn increase your oil pressure... This is normal, and if your vehicle is not doing this, then you may have a robelm with something(gauge, pump, etc..)

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
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  8. newyorkin

    newyorkin 1 ton status

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    BTW, are you running the stock electric guage, or a hydraulic/mechanical one (plastic hose running from engine up to back of guage)?
    If it's a stock electric, I'd recommend putting a mechanical guage on it to determine if what you're seeing is really what's happening. The stock electric oil guages can be kind of inaccurate after some age.
    Walmart has $10 oil pressure guages that'll do fine temporarily.
    And like Grim said, check out your belt driven accessories for that noise...

    Ratch
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  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Not sure how likely it may be, but maybe the pressure sender failed?? I know that the ones I have seen that I know are bad, make a rattling noise when I shake them. Nothing I could hear when it was running, but the gauge did act funny, which is what yours is doing. Senders are relatively expensive for just a test, unless you can get to a wrecking yard and they'll give you a used one. Really long shot that the problem is the sender, but hey, if it IS your problem, you'll be real happy its not more serious.

    Dorian
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    No anti-theft measures on your truck? No pity when its stolen
     
  10. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Dude...blower fan always runs even in off. Just runs on low. Turn the key to run but don't start the truck and you will see what I mean.

    It's not my damn planet monkey boy!
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    Grim-Reaper
     
  11. KENT

    KENT 1/2 ton status

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    Thanks Grim. That must be what it is. Since I changed the oil everything has been cool. Keeping my fingers crossed.

    Just put this thing back together, and now I am kind of over sensitive to noises and odd behavoir.

    Kent

    1989 K5 33X12.5 with 2.5" lift 12 bolt with aubur posi running 3.73 gears.
     
  12. KENT

    KENT 1/2 ton status

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    Thanks Grim. That must be what it is. Since I changed the oil everything has been cool. Keeping my fingers crossed.

    Just put this thing back together, and now I am kind of over sensitive to noises and odd behavoir.

    Kent

    1989 K5 33X12.5 with 2.5" lift 12 bolt with aubur posi running 3.73 gears.
     

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