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Ls1 oil pressure drops when pressing the throttle

This is a discussion on Ls1 oil pressure drops when pressing the throttle within the Internal Engine forums, part of the LSx Technical Help Section category; Hi, I have a 98 ws6, no mods done that i have noticed recently has the oil pressure drop when ...

  1. #1
    Junior Member VtBandit's Avatar
    Join Date
    Aug 2008

    Which one?

    Ls1 oil pressure drops when pressing the throttle

    Hi, I have a 98 ws6, no mods done that i have noticed recently has the oil pressure drop when i accelerate after being warmed up. It does it while driving or sitting at idle. It used to increase when i throttled it, just started doing this about a month ago. Checked oil, it is full. Only other thing i noticed preceding this happening was a few months ago it started ticking slightly at startup. Like a sticky lifter in my old 305...Just slight and it goes away when warm. Other than that i noticed nothing different. Any thoughts on why this is occuring? Should i be concerned something is gonna go bad? Anything i can do to stave it off if it is a sign of bad to come?

    F Small
    Oh yeah, has good oil pressure otherwise, just drops slightly when throttling it slow or fast doesn't matter...
    Last edited by VtBandit; 11-06-2010 at 05:45 AM.

  2. #2
    Awaiting Activation
    Join Date
    Oct 2007

    1998 T.A.

    Typical sign of large bearing clearances. Initial drop because tolerances open up on acceleration then rises as oil pump speed increases with rpm....

  3. #3
    Junior Member
    Join Date
    Nov 2010
    west chester ohio

    Metallic Blue
    2002 trans am ws6

    i have seen pressure drop due to a split in the o-ring that goes between the oil pump and pick up tube

  4. #4
    The Demon Demon_Z28's Avatar
    Join Date
    Feb 2008

    Bright Rally Red
    2001 Camaro SS

    i notice I usually have to add half a court of oil when I see this happen. I will sometimes notice that my oil pressure will drop on acceleration because of lower oil levels. My Z28 did this as well as my SS does.

  5. #5
    Senior Member MrMasterCraft's Avatar
    Join Date
    Nov 2009

    2002 C5 - M6 - Blue
    2000 Z28 - A4 - Pewter

    My white one does this. When it's warm, at 2k RPMs cruisinig around 65mph on the highway, it'll sit at 40lbs maybe less. I can get off onto a main county road, and when on my initial deceleration, the pressure jumps up about 5-8lbs for a few seconds then goes back down. Oil is at the tip top of operating range as well Motor won't be ready till spring, don't wanna replace as of yet

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