TQ 9103s no port to vacuum advance of distribuitor ???

1975 - 1979 Mopars

  1. Arturo Ruiz

    Arturo Ruiz Member

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    Regads from México City, I have an TQ 9103s, it was working but it eas so dirty so I took out to clean it. I note the hoses connections and I note it not exist a vacuum port to distribuitor!

    The vacuum advance in distribuitor it was conected to brass port to carb's plastic bowl, once cleaned I reconnect the hoses in the same way but the car not start, and I noted a little amount of gas in that hose, please can someone tell me where I can connect the hose from carb to distribuitor?

    The TQ 9103s has only 2 ports in front and 2 ports rear.

    Thanks in advance [​IMG] img_20200725_124526-jpg.jpg

    EditReport
     
  2. coloradodave

    coloradodave FBBO Gold Member FBBO Gold Member

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    Arturo,
    If your car is a 1977 it may have the 'clean burn' engine, in which case the distributor vacuum hose may go to a small box, not the carburetor. I'm not familiar with that system but will do some research. Someone on here should know for sure...@383man
     
    Last edited: Aug 30, 2020
  3. furious70

    furious70 Well-Known Member

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    Lean Burn, computer controlled timing.
     
  4. coloradodave

    coloradodave FBBO Gold Member FBBO Gold Member

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    Arturo,
    The clean burn system diagrams don't show a vacuum hose from the distributor, they were electronically controlled as furious70 said above. If your distributor does have a vacuum canister, it's very possible that someone changed out the factory distributor and disconnected all the clean burn stuff. I understand that it was quite common back then, as there was a fairly high failure rate of the components.
    If that's so, it's possible that they put a 'T' in one of the other vacuum hoses to get a source. Check all the other hoses to see. Not sure what the fitting is that sticks out of the plastic float bowl, but it's not for a vacuum source. Hopefully, 383man will show, as he was a Chrysler technician. Also, look on the bottom side of the hood for a diagram and routing of all the hoses.
     
  5. RWG75

    RWG75 Well-Known Member

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    Most above is right. Lean burn ignition has no vac can on dist and no vac source on TQ base plate. To do the lobotomy correctly ya gotta swap both plus add the ECU. Ya can add a dist vac port to a lean burn TQ pretty easily. No clue why they put that blind port on venturi.
     
  6. rumblefish360

    rumblefish360 Well-Known Member

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    Bingo!

    To add the vacuum port you’ll need to have the metal tube first. I have no idea where to get one except from another carb. But it is possible to drill the hole and insta a tube.

    What I would do is get another carb. Be it another TQ or other style carb. A performance vacuum advance distributor (I know you have one already) and an upgraded ignition box. A MoPar style ignition box I would choose would be the Chrome box or one from FBO @ 4secondsflat.com.
     
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