SBC TPI manifold questions

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    Subj:   Re: SBC TPI manifold questions
    Date:   96-01-31 11:11:38 EST
    From:   jsg at coulomb.eng.ohio-state.edu (John S Gwynne)

  > Manifold question:

  > On the base plate there are three holes into the coolant passage.  One
  > still has a coolant temperature sensor (CTS), another a bypass hose to
  > the throttle body, and the third is empty.  What originally attached to
  > this last location?

    The timer/switch for the cold start injector.

  > Throttle body questions:

  > Q) I would guess the top hose connection on the right side is a for the
  >    charcoal canister (just filtered fresh air).  Correct?

       Filtered fresh air for the PCV system.

  > Q) The second one down on the right looks like a "typical" vacuum port.
  >    Sound about right?

       Like Charcoal cannister purge.


  > Q) Now the tough one...  there is a port vacuum signal near the left
  >    throttle plate that works its way down to the bottom left of the
  >    throttle body just behind the coolant passage.  I have a hole here
  >    with no hose barb or anything.  I assume something use to attach
  >    here; what?

       I don't know for sure, but the EGR system uses ported vacuum.....

  > Thanks for the help.

    You are welcome.   Scot Sealander  FIScot at aol.com