Vacuum Line

Discussion in 'Technical' started by pr142, Dec 23, 2007.

  1. pr142

    pr142 Member

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    I have never posted to this forum but have been reading for quite some time.

    I am the original owner of a 1976 four door with a 302. I just rebuilt the motor and dropped it in on Saturday. Fired right up and did the whole 20 minutes at 2000 rpms etc.

    Today started it up and shifted to drive and the trans would not engage....same for reverse, 1st and 2nd. There was absolutly nothing wrong with the transmission last month when I drove into the garage and pulled the engine.

    I have two questions:

    1) where does the vacuum line to the modulator hook up?

    2) what is that "valve" on the passenger side exhaust pipe? It also has a vacuum hook up.
     
  2. newtoford

    newtoford Member

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    the vac modulator just needs to be plugged into a vac port on the intake manifold. if its not hooked up it'll run like total crap, but once it is hooked up some adjustment may be necessary

    im not sure what could be on the exhaust pipe. there is however a fresh air pump that will feed into the exhaust manifold on that side. its to clean up tail pipe emissions but i just plug them off if you dont need to worry about inspections
     
  3. 71gold

    71gold Frank Cooper Supporting Member

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    ...that "valve" on the passenger side exhaust pipe...
    i think has something to do with the... smog stuff...

    ...frank...:hmmm:
     
  4. pr142

    pr142 Member

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    Double checked the vacuum line. It is hooked to manifold port. Then I checked the fluid.... Down 3 quarts. This should have been the first thing I checked....but didn't.

    All is working fine now. Thanks.

    Greg
     
  5. pr142

    pr142 Member

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    I think you are correct. It seems to be functional. Every thing is running great.

    Greg
     
  6. 71gold

    71gold Frank Cooper Supporting Member

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    Greg,
    do you know why it was ...3 qrts. low? :huh:

    ...:chirp:
     
  7. pr142

    pr142 Member

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    Yes. When I removed the dip stick tube oil leaked out. At the time, I had estimated it to be about a quart. So I had only added a quart prior to initial start up. Added 2 1/2 quarts more which brought the level to the mark. Now it shifts into gear correctly.

    Greg
     
  8. bowstick

    bowstick Member

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    dont you just LOVE it when things work out
     
  9. pr142

    pr142 Member

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  10. baddad457

    baddad457 Member

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    That valve on the passenger side exhaust is the heat riser. When cold, it shut the butterfly in the exhaust to help the engine heat up faster. Best thing to do with it though was remove it all together, you don't need the restriction.
     
  11. pr142

    pr142 Member

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    Unfortunatly, here in CA I need to get the car smog checked every two years. My concern is that it would not pass. Otherwise I would do that. The good news is that the valve is functional.

    Greg
     
  12. newtoford

    newtoford Member

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    no, you should still pass. it might run a little diffrent when you first start it up but if you pull into the DMV and yo got the engine nice and warm the butterfly would be open anyway, so having it removed wouldnt be noticable
     
  13. Erocker

    Erocker Member

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    great information I am learning

    Hey guys not trying to start up any old posts but YOU GUYS ARE AWSOME I am learning alot of good info,I would not have elsewhere thanks from Eric in Ohio wish it was nice out to do some wrenching
     

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