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oil leak

This is a discussion on oil leak within the General Help forums, part of the LSx Technical Help Section category; So yesterday i went under my car (01 trans am A-4) and it looks like i have a oil leak, ...

  1. #1
    REAPER Z28 reaper ws6's Avatar
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    oil leak

    So yesterday i went under my car (01 trans am A-4) and it looks like i have a oil leak, but i cant tell were is coming from. I dont think is from the oil pan. Were do these car's leak from? do they have a spot that there know for leaking?? also the car has 141k on it.

    thanks for the help guys

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    REAPER Z28 reaper ws6's Avatar
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    well after cleaning everything up it looks like is coming from the top of the bell housing. what could this be? could it be the rear main seal?

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    Spaz is My Mentor SMWS6TA's Avatar
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    It's starting to sound like the OPSU (Oil Pressure Sending unit), Cost about $58. It's common for them to break. The OPSU over time becomes brittle from the thousands of heat cycles.

    It is located just behind the intake manifold on the drivers side. You should have enough room to reach behind the intake and feel for it. If you feel oil that's the problem.

    To fix - the best way is to get an OPSU socket from any of the parts stores for about $10, remove the intake (follow the how to install a new intake manifold thread in the tech stickies). Remove and replace the OPSU and then reinstall the intake. Takes about a couple of hours and is really not that hard to do.

    Second way and much more difficult is not remove the intake and try to get to the OPSU. Besides having everything in the way you also are doing it blind.

    Some swear they can do it the second way and have no problems but I look at it like this. There is a right way and a wrong way to do things.


    In the pic below, the black piece sticking up with a green top is the OPSU. It has a wire harness that connects to it.




    Any more questions just ask.

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    i have a small leak with my transmission. its a 96 lt1 camaro. i cant really see where its comin from. is there anythin thats common with those to leak. its an auto trans

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    REAPER Z28 reaper ws6's Avatar
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    will do let me just go out side and check rite now lol. Give me 10 sec's

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    REAPER Z28 reaper ws6's Avatar
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    well is kinda oily but not to bad. What else could it be? ill keep checking it do.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Valve cover leak in the same area could also be a possiblity, Rear main seals are rare these days, I'm not saying that it can't happen or isn't it.


    How's your oil pressure reading? Does it fluctuate? are you not getting and readings? These will help point to the OPSU. It can have a small crack and still work.

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    Smiles for 9.5 Years cammed goat's Avatar
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    I agree on the OPSU. Sucks!!!

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    REAPER Z28 reaper ws6's Avatar
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    yeah it fluctuate. Wen cold is above 40 and wen warm is rite in the middle at 40. I think is the rear main seal, cause i clean everything and i let it run for a while then i got under it again and it seems to leak from were the bell housing meets the trany and is deff engine oil. Im prob going to keep checking the OPSU but most likely im going to get the trany pull out to do the rear main seal and all the other gasket, trany bell all of them i guess.

    Dam! there goes 1k for nothing you got to love this car's, im going to call the dealer as i both warranty, they better not bullshit me >

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    Senior Member wileyCoyote's Avatar
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    i got my rear main seal replaced when i got clutch replaced (approx. 150k miles), it was leaking some i was told..

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    Smiles for 9.5 Years cammed goat's Avatar
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    Well...look at it this way, if the rear main is leaking, you can have the clutch/flywheel examined while the trans is out. Better to know if you need a new clutch and flywheel resurface now than later on.

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    REAPER Z28 reaper ws6's Avatar
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    is a auto, i was thinking of putting a stall since the trany is going to be out, but im not sure cause is my wife car and is not really needed all it gots is bolt on's and i dont run it.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Ah. OK.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Reaper, let us know what you find and how is Tyler been? I have family down the road in Kilgore. It's been a while since I've been back.

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    Retired NOT tired SteveC's Avatar
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    Quote Originally Posted by cammed goat View Post
    I agree on the OPSU. Sucks!!!
    +1 on that, mine had a small crack in it after 9 years.

    SteveC

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    Since you're gonna have the trans out anyway be sure to replace the rear main housing gasket as well

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    REAPER Z28 reaper ws6's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    Reaper, let us know what you find and how is Tyler been? I have family down the road in Kilgore. It's been a while since I've been back.
    is been good man, nothing is change still a small boring town lol

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    REAPER Z28 reaper ws6's Avatar
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    Quote Originally Posted by nomasterase View Post
    Since you're gonna have the trans out anyway be sure to replace the rear main housing gasket as well
    the weird thing is that it stop leaking oil? and wen it was leaking my oil level did not go down? weird rite? idk what to do im just going to keep checking

  19. #19
    Spaz is My Mentor SMWS6TA's Avatar
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    Could it have been excess left over from the main seal getting fix? Like a sloppy job.

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    REAPER Z28 reaper ws6's Avatar
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    i have no clue, it was really gunky i clean all of it up really good, i think it may be a really small leak or something, either way i keep checking just in case, oh i did the oil change with this new mobil one oil they just cam out with i think is call super mobil 1 or some, and it stop leaking? i dont know ill still keep checking

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