Question about GMC Jimmy

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I got a 85 GMC S15 jimmy 4x4 with 2.8 V6 700r4 tranie i have replaced the distributer, the coil, the battery, the TV cable, done a tranie service, and rebuilt the carburater. when i bought this truck it had no oil pressure and next to nuthing for power. now my oil pressure is way high over the 80 on the oil gage. and i now have some power on flat ground but nuthing when going up hill. i cant think of anything els to try to fix this problem.

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  • spann_dex Jul 27, 2008

    this is a great help never heard of a oil pressure relieve vail but will look into it.
    is there any more ideas on this?

  • spann_dex Jul 27, 2008

    thank

  • spann_dex Jul 27, 2008

    thank you all for your help. when you stated the oil pump i thought how could it be bad as i do have oil pressure. now with ferther explenation i understand why you stated oilpump. and i have done to much work on this truck to tell you every thing done and why.



    Thank you agian

  • spann_dex Jul 27, 2008

    yes this is very true.

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  • Master
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Hello,
Sounds like your OPRV (Oil Pressure Relief Valve) has jammed closed. This is an internal engine component and will necessitate sump removal to rectify!!!...Thank you...

Regards!!!..

Posted on Jul 27, 2008

  • Natesan Sabesan
    Natesan Sabesan Jul 27, 2008

    Yeah Please check to the OPRV first which if replaced must solve your problem buddy..

    Regards!!...Good luck...


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  • GMC Master
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Did you check the oil pump, looks like it is faulty.

Posted on Jul 27, 2008

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  • Ginko
    Ginko Jul 27, 2008

    Welll.... first it is quite difficult to understand your problem, you bought the car with "no oil pressure" and you rebult carburator(?!) and replaced distributor, battery and coil.
    IF truck had no oil there must have been a reason, unless it had been emptied by previous owner or had a leak.
    Check if youyr engine compression. probably cylinder rings are far from being in good shape
    I still wonder how you fixed a no oil problem with carburetor and distribution.
    I think it will be easier to fix it if you provide more details on current situation, instead of hunting some answer you already expect.
    Does the car consume water? does it consume oil? is it leaking? does it waste more fuel than it should? is there oil on spark plugs?

  • Ginko
    Ginko Jul 27, 2008

    Well the Oil Pressure Relief Valve is part of the oil pump, and it is located on the pump body.
    You don't replace the oil pressure valve, you replace the pump, as the valve is part of it.
    The valve is the part of the pump that opens to relief pressure when this is too high.
    Effectively when the pump valve is broken, oil has more pressure than usual, and is one of reasons to replace the oil pump.


  • Ginko
    Ginko Jul 27, 2008

    More on this, the relief valve normally is rarely opened, and only at a very high number of rpm.
    Generally oil pressure must be around 10 psi for every 1,000 rp, therefore 80 psi is definitively a far too high value, unless you replaced your car engine with a Formula Indy or Formula one engine.
    Ensure that you measured oi pressure properly, when it is too hight you usually get oil spurting out from oil filter, or from oil filter gasket.



  • Ginko
    Ginko Jul 27, 2008

    I understand and I know, restoring old cars may take a lot of money, time and dedication, but at the end is a great satisfaction when you get em on the road.

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