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  1. #1

    Default High temp and oil pressure

    My oil pressure had been at about 17psi (per the dash gauge) and lately it seems to pop down to 3 to 5psi abruptly at idle and the check guages light illuminates. I drive to the next light and it may or may not drop that low again. The temprature is consistently 165 degrees even at 95 degree temps outside. The engine runs smooth no ticking or knocking. Can I assume that since the temprature is not climbing, there is no audible signs of a problem, and the pressure gauge does not remain consistently low at idle that the issue is most likely in the guage, wiring, or sensor OR could this actually be a low oil pressure issue.
    Danny
    Saint Petersburg FL
    1999 SUBURBAN LT C1500
    1985 MAZDA RX-7 BLOWTHROUGH TURBO
    1987 BMW 325IS
    1994 Infinti Q45
    1997 Nissan Maxima GLE


  2. #2
    Jr. Engineer
    Join Date
    Feb 2007
    Location
    Edmonton, Alberta, Canada
    Posts
    298

    Default

    here come the stupid questions.

    Whats your oil level like?

    what weight oil?

    how many miles on the motor?

    etc please

    1993 K1500 Suburban 350TBI, 378,486KMS on frame, 49,000KMS on Drivetrain. Lots of mods, built for haulin trailers and haulin @$$ :)

    2000 K2500 Yukon XL 6.0L Vortec 252000KMS custom CAI, and exhaust...but not done yet.

    "If you are dumb enough to do something you don't know how to do, and can't do it safely then WHEN you get hurt its your own fault...BONEHEAD"

  3. #3

    Default

    oil level is fine

    5w 30

    136k miles

    if the only way to be sure is by hooking up a mechanical gauge i will do so... just thought someone might say that if i were actually sitting at that low pressure it would have shown via the temp or sound... but if that cant be used to confirm then i will do the mechanical gauge test tomorrow.
    Last edited by i_build; 06-27-2009 at 10:46 PM.
    Danny
    Saint Petersburg FL
    1999 SUBURBAN LT C1500
    1985 MAZDA RX-7 BLOWTHROUGH TURBO
    1987 BMW 325IS
    1994 Infinti Q45
    1997 Nissan Maxima GLE


  4. #4
    Jr. Engineer
    Join Date
    Feb 2007
    Location
    Edmonton, Alberta, Canada
    Posts
    298

    Default

    how long since last oil change? and have you actually dropped your oil pan ever?

    check for metal filings and such.

    I had a similar problem in my burb and I ended up having to rebuild the motor ( not to say you will have to ) but the main bearings and rings were so worn that once the motor got up to N.O.T it couldn't hold pressure... you could try a heavier oil if your motor will allow for it..

    1993 K1500 Suburban 350TBI, 378,486KMS on frame, 49,000KMS on Drivetrain. Lots of mods, built for haulin trailers and haulin @$$ :)

    2000 K2500 Yukon XL 6.0L Vortec 252000KMS custom CAI, and exhaust...but not done yet.

    "If you are dumb enough to do something you don't know how to do, and can't do it safely then WHEN you get hurt its your own fault...BONEHEAD"

  5. #5

    Default

    So your temps never climbed? Did it seize on you?

    I put about 2000 miles on it since the change.

    I have not dropped the oil pan.
    Last edited by i_build; 06-27-2009 at 10:51 PM.
    Danny
    Saint Petersburg FL
    1999 SUBURBAN LT C1500
    1985 MAZDA RX-7 BLOWTHROUGH TURBO
    1987 BMW 325IS
    1994 Infinti Q45
    1997 Nissan Maxima GLE


  6. #6
    Jr. Engineer
    Join Date
    Feb 2007
    Location
    Edmonton, Alberta, Canada
    Posts
    298

    Default

    didn't seize, and the temp stayed bout the same

    1993 K1500 Suburban 350TBI, 378,486KMS on frame, 49,000KMS on Drivetrain. Lots of mods, built for haulin trailers and haulin @$$ :)

    2000 K2500 Yukon XL 6.0L Vortec 252000KMS custom CAI, and exhaust...but not done yet.

    "If you are dumb enough to do something you don't know how to do, and can't do it safely then WHEN you get hurt its your own fault...BONEHEAD"

  7. #7

    Default

    I would believe your assumptions are correct. Remove the sending unit and install a pressure gauge. This is the only way to know for sure what your real oil pressure is doing. You can borrow one from Auto Zone for free.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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