Question about 1987 GMC S-15 Pickup

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I need diagram for vacum hose with tee check valve location and all componets 4x4 jimmy

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What year and engine size???

Posted on May 30, 2010

  • 4 more comments 
  • dw6198 May 30, 2010

    4.3 v6 1991 gmc

  • GetMeOttaHere May 30, 2010




    91 gmc 4.3

  • dw6198 May 30, 2010

    that diagram is not showing the 4x4 actuator and vacum conection for transfer switch and the main vacum. there is a tee with check valve. i do not want to put vacum on a componet that is part of the check valve



    Thanks for the other diagram that may help some i will look at truck again and the egr valve shown







  • dw6198 May 30, 2010

    there is also a connection on the intake manifold that is part of system , and interior vent climate flappers,

  • GetMeOttaHere May 30, 2010

    I see. I did not realize you were looking for the 4x4 vacuum route. I'll see if I have that.

  • dw6198 May 30, 2010

    i used the digram you provided and it helped me clean up the other vacum , thanks, that left me with the intake manifold vacum port i used that for vacum assesorirs such as cruise control, 4x4 acuator and dash vacum assist, i think it will be ok but if you have the route i will check what i have .



    thanks for your help i am just getting truck back together and the vacum and 4 wheel drive was not working, all seems to be good now



    dan

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