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88 K5 vaccum line question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Trigger, May 7, 2003.

  1. Trigger

    Trigger Registered Member

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    I'm trying to figure out where every vaccum line goes. I have found a vaccum line that was in the incorrect location but now I have a vaccum line that is not hooked up to nothing. The vac line is plugged into the back center of the intake manifold. It was plugged into the map sensor. The vac line that runs out the back of the TBI is suppose to go into the map sensor, therefor leaving the vaccum line that is coming out of the center of intake manifold tangling there. If anyone could tell me where it goes that would be helpful or if you can email,post,give url, that would also be very helpful. I can't tell if the loud noise is coming from the gas shooting into the TBI or if it's a vaccum leak. My Chilton's doesn't show this line in it's diagrams. /forums/images/graemlins/confused.gif
     
  2. JustHorsinArownd

    JustHorsinArownd Registered Member

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    uuuummmmmm plug it and see what happens?? If there isn't a hole there isn't a hole. Hopefully someone who has a better idea of what to do will come along soon for you.
     
  3. DukeBoy88

    DukeBoy88 1/2 ton status

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    I will check this out tomorrow morning. don't know it off the top of my head.
     
  4. Trigger

    Trigger Registered Member

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  5. DukeBoy88

    DukeBoy88 1/2 ton status

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    The dog wanted to go outside anyway. I just checked, and I have nothing plumbed into the location you describe. I do have a non-GM pipe plug there however and I did remove my smog equipment a long time ago. I can't remember anything going there though. don't know if this helped or not.
     
  6. scrappy88

    scrappy88 1/2 ton status

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    I checked on mine just now. On mine, the line goes to a T-fitting and splits off from there to three places. One line goes inside the cab just to the right of the heater assembly (prob for heater/AC/vent controls vaccum), one line goes to the far right corner of the firewall (drivers side) to a vaccum canister, and the 3rd line supplies vaccum to the cruise control module. I can take pics if you need them but it looks like that line is just a general vaccum line for various things.
     
  7. Trigger

    Trigger Registered Member

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    Pictures would really help me out.
     
  8. Trigger

    Trigger Registered Member

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    anyone???
     
  9. scrappy88

    scrappy88 1/2 ton status

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    Here you go, with some crude drawing skills to go with it. The red arrow is the vaccum port on the manifold that I think you are talking about. The green lines kinda show where the line goes and splits off to. Let me know if that helps or if it's not the port you're talking about. I didn't see any other lines coming off the back other than that one.

    [​IMG]
     
  10. Trigger

    Trigger Registered Member

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    THANK YOU!!!!!!!!!! /forums/images/graemlins/laugh.gif

    The line that is coming from heater controls was going directly to the cruise control. The port that is red was going to the vent where the egr valve is plugged into. This is SOOOO helpful. I don't think I could say "THANK YOU" enough times. THANK YOU!!!! /forums/images/graemlins/laugh.gif
     
  11. scrappy88

    scrappy88 1/2 ton status

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    No problem, glad to help out! /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     
  12. wadinator

    wadinator 1/2 ton status

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    Cool pic scrappy!/forums/images/graemlins/thumb.gif
     
  13. Trigger

    Trigger Registered Member

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    MAF sensor? Can you point it out on this picture? Chilton's is not showing where/what it looks like in book.
     
  14. MousePowrd

    MousePowrd 1/2 ton status

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    Your truck does not have a MAF sensor. It has a MAP (manifold absolute pressure) sensor, it is that flat sensor on a bracket on the passenger side of the throttle body
     
  15. Trigger

    Trigger Registered Member

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    Yeah we kinda figured that out after thinking about for a minute. /forums/images/graemlins/laugh.gif
     

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