Results 1 to 18 of 18

Oil pressure!

This is a discussion on Oil pressure! within the General Help forums, part of the LSx Technical Help Section category; I have a 99 t/a and i think my pump fixing to go down. In the mornings my o/p is ...

  1. #1
    Awesome member Bad Co.'s Avatar
    Join Date
    Aug 2009
    Location
    Texas
    Age
    34
    Posts
    56

    Green
    1994 Z28

    Oil pressure!

    I have a 99 t/a and i think my pump fixing to go down. In the mornings my o/p is about 40 lbs. Then when it warms up it will run about 20lbs when i stop @ a light. Last night is went a hair below 20 and when i was driving about 1700 rpms it wouldnt go over 20lbs. Can someone fill me in on whats going on? Is this normal? Am i fixing to be putting a oil pump in? By the way I dont know is this matters but i do have quite a few bolt ons, heads, etc.

  2. #2
    Member c5z28's Avatar
    Join Date
    Apr 2008
    Location
    Bay Area
    Posts
    8,120

    On your ass flashing
    my highbeams

    The earlier oil gauges are more accurate than the later ones. Mine usually reads just under 40psi at idle how many miles do you have on it? I'm no expert but you could take off a valve cover and see if it is getting oil up there.

  3. #3
    Awesome member Bad Co.'s Avatar
    Join Date
    Aug 2009
    Location
    Texas
    Age
    34
    Posts
    56

    Green
    1994 Z28

    just turned 90k

  4. #4
    Moderator Cutlass's Avatar
    Join Date
    Apr 2008
    Location
    Madison, WI
    Posts
    6,998

    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    it might be a pump but could also be a bad gauge or worn bearings

  5. #5
    Member
    Join Date
    Aug 2005
    Location
    Tulsa,OK
    Age
    37
    Posts
    914

    Quick Silver
    2002 Z06

    Are you low on oil? What kind of oil filter are you using and how long since the last oil change?

    As long as its around 20 and increases when you are above idle, I would not worry right now.

    I don't know the specifics but technically speaking the engine needs a relatively small amount of oil pressure per 1000 rpm. Someone who knows that figure might chime in but at 20psi while idling your fine.

    I'd keep watching it like you obviously do out of normal driving and not worry about it.


    Slow Passenger Window - Want Passenger Express Down - Tired of Replacing DayTime Running Light Bulbs

    Camaro Owners Click Here
    Firebird Owners Click Here

    Need instructions to replace your F-Body window motor?
    www.AutoTrix.net

  6. #6
    Moderator Cutlass's Avatar
    Join Date
    Apr 2008
    Location
    Madison, WI
    Posts
    6,998

    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    generally 10 psi per 1000 rpm is safe

  7. #7
    What Would Earl Do? Vexzer's Avatar
    Join Date
    Apr 2007
    Location
    Kirby, TX
    Posts
    230

    Fire
    2002 SS

    Quote Originally Posted by Bad Co. View Post
    ...i do have quite a few bolt ons...
    Time to bolt on an oil pump. [Just kidding.]

    Change your oil before doing anything. Use the right stuff according to spec and temperatures.

    If you are really worried, t-tap at the stock sending unit and mount a mechanical gauge under the hood for monitoring purposes
    [a man with 2 watches never knows what time it is].

  8. #8
    Awesome member Bad Co.'s Avatar
    Join Date
    Aug 2009
    Location
    Texas
    Age
    34
    Posts
    56

    Green
    1994 Z28

    I think i might be ready for a oil change. I only run mobil 1 5-30 with a ac delco filter. But i also think im going to change the sending unit cause i caught wind by a trusted ls1 mech in my home town saying that some of the early ls1 cars have faulty sending units behind the manifold.

  9. #9
    What Would Earl Do? Vexzer's Avatar
    Join Date
    Apr 2007
    Location
    Kirby, TX
    Posts
    230

    Fire
    2002 SS

    Quote Originally Posted by Bad Co. View Post
    ac delco filter
    Inside word is that the WIX filters at O'Reilly's are best as far as common retail products go, & Fram & some other advertized names are poor.

  10. #10
    Member JRENIGAR's Avatar
    Join Date
    Oct 2009
    Location
    arkansas
    Posts
    371

    red
    99 camaro

    OP, I had the same problem with mine with 140k on the clock. I was getting around 18-20psi at idle when warm and around 30psi at 2000rpm and above. I was running 5w30. I Just changed the oil and went with 10w30 and now it has 50psi when cold and 35ish when warm. BTW Chiltons manual says 6psi at idle is fine. 20psi at 1000rpm and 30psi at 4000rpm is sufficient. Seems kinda low to me but thats what the book says. Try the 10w30 oil change first and let us know.

  11. #11
    Retired NOT tired SteveC's Avatar
    Join Date
    Jul 2005
    Location
    Poway, Ca
    Posts
    1,126

    SOM
    2001 Z28 (Sara)

    An obscure point, it maybe a bad electrical sending unit.

    SteveC

  12. #12
    Member JRENIGAR's Avatar
    Join Date
    Oct 2009
    Location
    arkansas
    Posts
    371

    red
    99 camaro

    ^^^ this is true.

  13. #13
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    Try swapping out senders and see if there is a discrepancy in pressure readings. And make sure you are not leaking any oil as some senders tend to crack and leak over time.

  14. #14
    Awesome member Bad Co.'s Avatar
    Join Date
    Aug 2009
    Location
    Texas
    Age
    34
    Posts
    56

    Green
    1994 Z28

    Im changing the s/u this weekend. My car has NEVER leaked a drop of oil or burned any. The runs like a cheetah with hitops. Thats what i dont understand. shes my dd that why im so freaked out. But hopefully this weekend i will find out. Fresh oil change and new s/u. I will post the results asap. thanks for all your help.

  15. #15
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    Keep us posted.

  16. #16
    Awesome member Bad Co.'s Avatar
    Join Date
    Aug 2009
    Location
    Texas
    Age
    34
    Posts
    56

    Green
    1994 Z28

    ok gentlemen, it turned out to be ONLY a sending unit. Everything went very well. Untill yesterday. my frikin blinkers stopped blinking. I checked every single lightbuld, and peanut light. All was good. Fuse was good. Just when i was gone give upi made a phone call to a very trusted f-body guru. ls1.com user name "venomous". we nailed the problem out quickly. it ended up being a frikin blinker relay. 2.99 part. I hope that this thread helps somebody. And thanks guys for all your input.

  17. #17
    Smiles for 9.5 Years cammed goat's Avatar
    Join Date
    Jan 2009
    Location
    Paterson/Ridgewood, NJ
    Posts
    11,474

    Phantom Black Metallic
    2004 GTO M6

    Glad to hear ya fixed your ride.

  18. #18
    Member
    Join Date
    Sep 2005
    Location
    Charleston, SC
    Age
    37
    Posts
    111
    20 seems low to me, never got that far on either ls1 I've had. I think the worst was like 35, and that was because I was sitting for a few hours on a strip cruising
    2001 transam ws7 * black/black * modded up. * sold
    1993 3000gt vr4 * silver/tan * modded/boosted/awd * sold

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help: oil pressure
    By Z28boy2000 in forum General Help
    Replies: 16
    Last Post: 07-14-2009, 08:32 AM
  2. Help: Oil pressure goes down!??
    By 98T/A.SNAKEATER_ in forum General Help
    Replies: 15
    Last Post: 11-02-2008, 07:08 AM
  3. Replies: 3
    Last Post: 04-01-2006, 04:59 PM
  4. Looking for gauges! nitrous pressure, fuel pressure!
    By texasss in forum Parts Wanted / Trade
    Replies: 2
    Last Post: 10-29-2005, 10:05 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •