Results 1 to 20 of 20

LS1 low oil pressure

This is a discussion on LS1 low oil pressure within the General Help forums, part of the LSx Technical Help Section category; I have a 383 LS1 in my 64 vette built by a local engine builder. It has about 200 miles ...

  1. #1
    Junior Member
    Join Date
    Jul 2006
    Location
    Kansas City
    Age
    60
    Posts
    6

    silver blue
    1964 corvette

    LS1 low oil pressure

    I have a 383 LS1 in my 64 vette built by a local engine builder. It has about 200 miles on it and has only about 25# oil Pres cold and very little at idle warm. The block was new and did not even have plugs in it when bought. I don't remember buying the "barbell Oil restrictor" and wonder if one was installed, would it still build pressure but drain off at idle? or could I have a suctionleak with my pickup tube? I used an SLP oil pump. I am open for any hints.
    Thanks,
    Steve

  2. #2
    Member cailey37's Avatar
    Join Date
    Mar 2006
    Location
    Mississippi
    Posts
    832

    Silver
    1998 Pontiac Trans Am

    You may want to check and make sure that your builder put the barbell restrictor on and not just a plug back there.....can't imagine that it would be a problem with the oil pump........I run a SLP on mine and I get around 60psi.....

  3. #3
    Junior Member
    Join Date
    Jul 2006
    Location
    Kansas City
    Age
    60
    Posts
    6

    silver blue
    1964 corvette

    Thanks, I am afraid that may be whats wrong. I reeeally hate to pull the trans but oh well.

  4. #4
    Junior Member
    Join Date
    Jul 2006
    Location
    Kansas City
    Age
    60
    Posts
    6

    silver blue
    1964 corvette

    Also what have you done to engine, sounds good!

  5. #5
    Member cailey37's Avatar
    Join Date
    Mar 2006
    Location
    Mississippi
    Posts
    832

    Silver
    1998 Pontiac Trans Am

    It sucks but it beats losing the motor.........good luck with it....

  6. #6
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    what do you mean by barbel restrictor? any info? i have one that is doing it when it warms up but is fine when it's cold i'm hoping it's not a bearing.

  7. #7
    Junior Member
    Join Date
    Apr 2007
    Location
    ATX
    Posts
    22

    RED
    98 T/A

    pinched o ring

  8. #8
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    where was the o ring? mine is idling around 40 45 with the stock gauge and when it warms up the pressure drops to 20 then 10 then 0. and if you rev it the gauge wont move. i'm thinking it is the sending unit. gonna pull it and hook up a manual gauge.

  9. #9
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,468

    98 Formula
    06 duramax

    Like was said above.
    I've read where a pinched o-ring on the pickup tube will do this. The pressure will be ok for a little bit then drop dramatically when the o-ring fails. Either way I wouldn't risk the motor and find out what it is before running it anymore.

  10. #10
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    and if the o ring was on the pickup you had to pull the engine correct?

  11. #11
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    put the manual gauge on it today and idled fine until it warmed up and dropped to around 10 and then a little lower than that and stayed there. any opinions? i guess i'm going to pull the pump and see if the oring is damaged and sealing. any other hints or suggestions? can i get to the oring by just pulling the timing chain cover?

  12. #12
    Veteran 0rion's Avatar
    Join Date
    Aug 2005
    Location
    ohio
    Posts
    22,468

    98 Formula
    06 duramax

    when it was cold what was the pressure? I would think a failed o-ring would be kinda low all the time unless the cold thicker oil is helping with pressure.
    Yeah, front cover has to come off and you have to drop the oil pan. Not sure what kind of k-member clearance you have on that car though so it may be different.

  13. #13
    Impounded
    Join Date
    Feb 2007
    Location
    Pa
    Posts
    276

    Red
    99 TA

    gm's bulletin on this says normal oil pressure cold and loud ticking lifters with low oil pressure hot is symtoms of the oring damage.The lifters tick because air gets introduced into the oil through the oring damage.

  14. #14
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    when its cold the pressure is 35 to 40. idling. then drops to 25 then 20 and so forth. stays between 5 and 10. i cut it off there didnt want to risk anything to see if it would drop lower. any ideas? i'm going to support the engine with a stand on the top of the engine and drop the kmember so i can get access to drop the pan and stuff. anything is appreciated as far as ideas.

  15. #15
    Impounded
    Join Date
    Feb 2007
    Location
    Pa
    Posts
    276

    Red
    99 TA

    are the lifters ticking?

  16. #16
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    it has a little top end noise but the car has a jesel top end so it is solid.

  17. #17
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    anymore input or ideas?

  18. #18
    Member
    Join Date
    Oct 2005
    Location
    calif.
    Posts
    213
    You don't need to drop the pan to get to the -o-ring on the pick-up tube--It is in front of the engine --visible with removal of the timing cover---

  19. #19
    Junior Member
    Join Date
    Feb 2006
    Location
    gulf coast mississippi
    Posts
    89
    ok. i droped the kmember and pulled the pan and all the parts on the engine. had alot of gasket maker and the oil pan was a little drity but the puckup screen was ok as well as the oring. oil pump didnt look too new so i put a ls6 oil pump on it and cleaned everything up. hopeing that was my problem. needless to say it wasnt. idled around 50 psi then droped to about 7 when the engine reached 200. so i'm stuck i'm thiking cam bearing? any more ideas or anything.

  20. #20
    Junior Member bigjpyn's Avatar
    Join Date
    Mar 2007
    Location
    cali
    Posts
    23

    puiter
    1999 trans am

    Hey i know im really late, but i had this same problem, number one cam bearing spun.

Thread Information

Users Browsing this Thread

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

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
  •