Coming from the Carb...But what is it????

[jdbaker.vet]

Okay now that things are starting to come together a little more and more. I've got a chance to find out about something.

There seems to have been a "valve connector" or "butt connector" joining these two tubes together. Can anyone tell me

if it is imperative that they be rejoined? Thanks in advanced....

[MiCarl]

That's the vacuum line to the TCI. It lets the TCI sense the engine load and adjust the timing.

 

What joins the two hoses is not a butt connector, it's a restrictor. The purpose is to damp the vacuum pulses so the TCI sees an average rather than the wild swings in every cycle. It keeps the TCI from throwing the timing all over the place.

 

That restrictor has the same effect as the ones used on carb sync gauges. And it's important that it's on the engine end of the hose - the volume in the hose from the restrictor to the TCI is what damps the fluctuations.

[Prairiehammer]

I agree with Carl.

However, Jon, is that hose attached to the carburetor or to the intake boot (at the synch port)?

Your 1986 should not have a nipple for a hose ON THE CARBURETOR.

[jdbaker.vet]

I'm really going to have to take a look at it closer. Then the next question is. Where do I get that restrictor?

[luvmy40]

I agree with Carl.

However, Jon, is that hose attached to the carburetor or to the intake boot (at the synch port)?

Your 1986 should not have a nipple for a hose ON THE CARBURETOR.

 

 

Looks like it's on the manifold to me.

[luvmy40]

After a Second look, it looks like we are seeing the end that should be connected to the intake boot with a screw in it. I'd bet the other end is going to the Boost Sensor.

[van avery]

If someone installed a earlier aftermarket TCI on it might not have been set up for the Vacuum advance system to work and may have been disconnected/plugged. If memory is correct the early one were programed for the timing advance according to the RPMs.