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Oil pressure goes down!??

This is a discussion on Oil pressure goes down!?? within the General Help forums, part of the LSx Technical Help Section category; When i put the gas to the floor and giddy up my oil pressure gauge drops to almost and somtimes ...

  1. #1
    Junior Member 98T/A.SNAKEATER_'s Avatar
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    1998 pontiac Trans Am

    Exclamation Oil pressure goes down!??

    When i put the gas to the floor and giddy up my oil pressure gauge drops to almost and somtimes zero but when i drive normal its just fine. My oil level is right and the car only has 70,000 miles. Wut could this be
    Last edited by 98T/A.SNAKEATER_; 10-28-2008 at 07:44 PM.

  2. #2
    Junior Member TranzAm98's Avatar
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    Considering you know vehicles, hopefully you have checked your oil lately and made sure it's the right level! I could also be old oil, when was the last time it was changed! I'm thinking you have low/old oil or a very dirty oil filter. If all of that checks out fine then I wouldn't be worried about it, hell it could maybe an bad factory oil gauge!!

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    Junior Member 98T/A.SNAKEATER_'s Avatar
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    or a bad oil sending unit perhaps??

  4. #4
    Junior Member TranzAm98's Avatar
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    Does your oil pressure light come on when you turn on the car or when your getting into it!? I mean there are just so many thing that can happen like worn main bearings, worn rod bearings, oil pump failure, oil pump screen clogged. Just so many things! Unfortunately, if the oil pressure gauge is showing low oil pressure and/or even lower oil pressure after the engine warms up or the light starts flickering when the engine warms up... when that happens you probably DO have an oil pressure problem. When babbit bearings start to wear out the gap between the bearing and the crankshaft increases and the oil leaks out too quickly for the pump to be able to maintain oil pressure. When that happens, the ONLY option is to rebuild or replace the engine.

    But if it's a faulty oil sending unit it could cause the oil pressure light to come on steady or it might cause the oil pressure light to not come on at all, even when the engine is not running. Also the sending unit could make you oil gauge show no oil pressure or really high pressure!

  5. #5
    Junior Member 98T/A.SNAKEATER_'s Avatar
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    its weird man the oil light only comes on when i get on it and the pressure drops then when i let off the light goes off and the pressure goes back up.

  6. #6
    Junior Member TranzAm98's Avatar
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    It is possibly the drain back holes in the engine and they are partially plugged up. Once it pumps all the oil up into the engine, and it doesn't drain back quick enough, the pump has none or little to pump, so the pressure will drop off. When an engine gets sludged up, this is what happens.

    The best thing to do is install a shop gauge into the oil pressure sensor plug/hole and find out if the motor has oil pressure problems or if it's electrical problems.

  7. #7
    Member slpdablueZ28's Avatar
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    2002 Camaro Z28

    just happened too me. had an oil leak.

  8. #8
    Slow'er'Ass Mr. Luos's Avatar
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    Does this happen in 3rd and 4th gears?


    Fill to 6 quarts instead of 5.5 next time and report back.
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

  9. #9
    Junior Member 98T/A.SNAKEATER_'s Avatar
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    hmm... i wonder how i would find out where the oil pressure sensor hole/plug is

  10. #10
    OOHHH YEAH! jray0305usa's Avatar
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    what oil are u running? strait weight or multi-viscosity? dino (conventional) or synthetic? checkin your oil hot or cold?

  11. #11
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by 98T/A.SNAKEATER_ View Post
    hmm... i wonder how i would find out where the oil pressure sensor hole/plug is
    It is behind the intake on the driver side of the motor.

  12. #12
    Party Time, Excellent... Kingc8r's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    It is behind the intake on the driver side of the motor.
    And usually breaks when you take the intake off

  13. #13
    Member thisisthewayilive's Avatar
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    Quote Originally Posted by Kingc8r View Post
    And usually breaks when you take the intake off
    you're not jokin. i knew it was there and still broke it. $60 mistake i won't make again.

  14. #14
    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Kingc8r View Post
    And usually breaks when you take the intake off
    Not when it comes out...when it goes back in.

    I have no idea how I haven't had to replace mine yet.

  15. #15
    Mine did that when it was down 2 quarts....ops . Put some oil in the thing!

  16. #16
    Member side2000's Avatar
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    a buddy a mine had exact same problem and his oil pickup fell off his pickup tube. i suggest runnin a mechanical gauge to see what's really goin on...and not drivin it till ya do. if yer mech gauge says the same thing ya need to start tearin into that thing.

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