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TBI Vacuum Hoses

Discussion in 'The Garage' started by btolenti, Oct 15, 2005.

  1. btolenti

    btolenti 1/2 ton status

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    So, all the vacuum information I know is that the port on the front passenger side is for the EGR, the large one in the middle is for PCV, and the small one under it is for the EVAP. Unfortunately mine also has another port on the driver's side! Anyone know where this is supposed to go?

    I am swapping a TBI from a supposed 87 truck into my 86....

    Thanks....

    IM000882.JPG
     
  2. clarkjw24

    clarkjw24 1/2 ton status GMOTM Winner

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    I just plugged that port, but I wouldn't take to much advice from me because after 6 months of running good, I can't get mine to run right now. :mad:
     
  3. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    if your EGR line isn't also feeding the smog pump, it may be for that.. if your running one...

    my 87 has a dual feed on the pass side for EGR and smog, center PVC and drivers side is EVAP
     
  4. btolenti

    btolenti 1/2 ton status

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    I was thinking about that, but according to the vacuum diagrams I have seen, the diverter and EGR are fed from a tee-d off connection to the passenger side port.... :dunno:
     
  5. Russ

    Russ 1/2 ton status

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    I plugged that one on mine also, but if I remember correctly when I took the smog pump off there was a vacuum line from that port to the valve for the smog pump.

    Russ
     
  6. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    yup, thats how mine is... and i only have the 3 ports.. not sure what that says about the year of your tbi... i would say just plug it for now... :confused: :D

    mines a cfm tech one, but it was the same as the stock one..
    [​IMG]
     
  7. btolenti

    btolenti 1/2 ton status

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    I am running EGR and the SMOG pump with diverter valve.
    Should I just plug it and tee off the passenger port to the EGR and diverter, or should I use the driver one for the smog pump????

    Hopefully someone with a similar setup in California will chime in. I am really concerned about this passing SMOG...
     
  8. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    i would run the t setup on pass.. and plug that driverside...
     

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